forked from docs/doc-exports
Lu, Huayi
a24ca60074
Reviewed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com> Co-authored-by: Lu, Huayi <luhuayi@huawei.com> Co-committed-by: Lu, Huayi <luhuayi@huawei.com>
180 lines
22 KiB
HTML
180 lines
22 KiB
HTML
<a name="EN-US_TOPIC_0000001145830649"></a><a name="EN-US_TOPIC_0000001145830649"></a>
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<h1 class="topictitle1">Binary String Functions and Operators</h1>
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<div id="body8662426"><div class="section" id="EN-US_TOPIC_0000001145830649__s5850c819655f4dfdb4693e0474352121"><h4 class="sectiontitle">String operators</h4><p id="EN-US_TOPIC_0000001145830649__afe0d35b61e0846e4b32399c19bf9deed">SQL defines some string functions that use keywords, rather than commas, to separate arguments.</p>
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<ul id="EN-US_TOPIC_0000001145830649__u7c143551e8634c5cb0f3c4f600228dc3"><li id="EN-US_TOPIC_0000001145830649__l5a8db25b6c7d4fabaa62c129dd458fe3">octet_length(string)<p id="EN-US_TOPIC_0000001145830649__a647a3c34856f4f30b2d977f68dd5b1c7"><a name="EN-US_TOPIC_0000001145830649__l5a8db25b6c7d4fabaa62c129dd458fe3"></a><a name="l5a8db25b6c7d4fabaa62c129dd458fe3"></a>Description: Number of bytes in binary string</p>
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<p id="EN-US_TOPIC_0000001145830649__a052c9392b1394030826bd5b15626468c">Return type: int</p>
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<p id="EN-US_TOPIC_0000001145830649__ac013739218a4476a89dda174a3654f4a">For example:</p>
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<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001145830649__s5dab942a8f304327a837e6a1a2d74a51"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
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<span class="normal">2</span>
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<span class="normal">3</span>
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<span class="normal">4</span>
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<span class="normal">5</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="k">octet_length</span><span class="p">(</span><span class="n">E</span><span class="s1">'jo\\000se'</span><span class="p">::</span><span class="n">bytea</span><span class="p">)</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="k">RESULT</span><span class="p">;</span><span class="w"></span>
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<span class="w"> </span><span class="k">result</span><span class="w"></span>
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<span class="c1">--------</span>
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<span class="w"> </span><span class="mi">5</span><span class="w"></span>
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<span class="p">(</span><span class="mi">1</span><span class="w"> </span><span class="k">row</span><span class="p">)</span><span class="w"></span>
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</pre></div></td></tr></table></div>
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</div>
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</li><li id="EN-US_TOPIC_0000001145830649__l56f90666af344e879d7fd243e5f0287d">overlay(string placing string from int [for int])<p id="EN-US_TOPIC_0000001145830649__a01d6f8574cdc4e7ca3f40365943f2406"><a name="EN-US_TOPIC_0000001145830649__l56f90666af344e879d7fd243e5f0287d"></a><a name="l56f90666af344e879d7fd243e5f0287d"></a>Description: Replaces substring.</p>
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<p id="EN-US_TOPIC_0000001145830649__adea6b8b3447f4012a0b0b42c19c45fac">Return type: bytea</p>
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<p id="EN-US_TOPIC_0000001145830649__a9e3e137241ee4e13b21b54b6740d7549">For example:</p>
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<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001145830649__se989bc02d80a4c6a90a306978f927818"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
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<span class="normal">2</span>
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<span class="normal">3</span>
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<span class="normal">4</span>
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<span class="normal">5</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="k">overlay</span><span class="p">(</span><span class="n">E</span><span class="s1">'Th\\000omas'</span><span class="p">::</span><span class="n">bytea</span><span class="w"> </span><span class="k">placing</span><span class="w"> </span><span class="n">E</span><span class="s1">'\\002\\003'</span><span class="p">::</span><span class="n">bytea</span><span class="w"> </span><span class="k">from</span><span class="w"> </span><span class="mi">2</span><span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="mi">3</span><span class="p">)</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="k">RESULT</span><span class="p">;</span><span class="w"></span>
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<span class="w"> </span><span class="k">result</span><span class="w"> </span>
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<span class="c1">----------------</span>
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<span class="w"> </span><span class="err">\</span><span class="n">x5402036d6173</span><span class="w"></span>
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<span class="p">(</span><span class="mi">1</span><span class="w"> </span><span class="k">row</span><span class="p">)</span><span class="w"></span>
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</pre></div></td></tr></table></div>
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</div>
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</li><li id="EN-US_TOPIC_0000001145830649__lcecfdeb272e146ab9830dc9b63b8a277">position(substring in string)<p id="EN-US_TOPIC_0000001145830649__a1b883e8262e546b68872ec9eab0c4f8b"><a name="EN-US_TOPIC_0000001145830649__lcecfdeb272e146ab9830dc9b63b8a277"></a><a name="lcecfdeb272e146ab9830dc9b63b8a277"></a>Description: Location of specified substring</p>
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<p id="EN-US_TOPIC_0000001145830649__ae71a8dab6bf6449bbe2ed5c133f4ef28">Return type: int</p>
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<p id="EN-US_TOPIC_0000001145830649__ae28caec031064514a9b246ac6f7d8a91">For example:</p>
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<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001145830649__sc44b74b076f54caca0a48305dbb63ac2"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
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<span class="normal">2</span>
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<span class="normal">3</span>
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<span class="normal">4</span>
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<span class="normal">5</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="k">position</span><span class="p">(</span><span class="n">E</span><span class="s1">'\\000om'</span><span class="p">::</span><span class="n">bytea</span><span class="w"> </span><span class="k">in</span><span class="w"> </span><span class="n">E</span><span class="s1">'Th\\000omas'</span><span class="p">::</span><span class="n">bytea</span><span class="p">)</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="k">RESULT</span><span class="p">;</span><span class="w"></span>
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<span class="w"> </span><span class="k">result</span><span class="w"></span>
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<span class="c1">--------</span>
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<span class="w"> </span><span class="mi">3</span><span class="w"></span>
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<span class="p">(</span><span class="mi">1</span><span class="w"> </span><span class="k">row</span><span class="p">)</span><span class="w"></span>
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</pre></div></td></tr></table></div>
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</div>
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</li><li id="EN-US_TOPIC_0000001145830649__l392ffb78cab4437bb843c5fad745009b">substring(string [from int] [for int])<p id="EN-US_TOPIC_0000001145830649__a94b5180c06eb47cb96527b43a589b293"><a name="EN-US_TOPIC_0000001145830649__l392ffb78cab4437bb843c5fad745009b"></a><a name="l392ffb78cab4437bb843c5fad745009b"></a>Description: Truncates substring.</p>
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<p id="EN-US_TOPIC_0000001145830649__a2851abbbe6aa4fa49bbb470d81949b20">Return type: bytea</p>
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<p id="EN-US_TOPIC_0000001145830649__a87e8c05019804dc3913824e18d3fc49f">For example:</p>
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<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001145830649__s4668d7a5350f48df9f2435de780c2e17"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
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<span class="normal">2</span>
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<span class="normal">3</span>
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<span class="normal">4</span>
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<span class="normal">5</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="k">substring</span><span class="p">(</span><span class="n">E</span><span class="s1">'Th\\000omas'</span><span class="p">::</span><span class="n">bytea</span><span class="w"> </span><span class="k">from</span><span class="w"> </span><span class="mi">2</span><span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="mi">3</span><span class="p">)</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="k">RESULT</span><span class="p">;</span><span class="w"> </span>
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<span class="w"> </span><span class="k">result</span><span class="w"> </span>
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<span class="c1">----------</span>
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<span class="w"> </span><span class="err">\</span><span class="n">x68006f</span><span class="w"></span>
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<span class="p">(</span><span class="mi">1</span><span class="w"> </span><span class="k">row</span><span class="p">)</span><span class="w"></span>
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</pre></div></td></tr></table></div>
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</div>
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<p id="EN-US_TOPIC_0000001145830649__p5161816473">Truncate the time and obtain the number of hours.</p>
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<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001145830649__screen775145773120"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
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<span class="normal">2</span>
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<span class="normal">3</span>
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<span class="normal">4</span>
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<span class="normal">5</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">select</span><span class="w"> </span><span class="k">substring</span><span class="p">(</span><span class="s1">'2022-07-18 24:38:15'</span><span class="p">,</span><span class="mi">12</span><span class="p">,</span><span class="mi">2</span><span class="p">)</span><span class="k">AS</span><span class="w"> </span><span class="k">RESULT</span><span class="p">;</span><span class="w"></span>
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<span class="w"> </span><span class="k">result</span><span class="w"></span>
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<span class="c1">-----------</span>
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<span class="w"> </span><span class="mi">24</span><span class="w"></span>
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<span class="p">(</span><span class="mi">1</span><span class="w"> </span><span class="k">row</span><span class="p">)</span><span class="w"></span>
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</pre></div></td></tr></table></div>
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</div>
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</li><li id="EN-US_TOPIC_0000001145830649__l2207ec98c0364392bc2891d8ae985094">trim([both] bytes from string)<p id="EN-US_TOPIC_0000001145830649__a91c50f29c67a4f01bc01308d552fabd4"><a name="EN-US_TOPIC_0000001145830649__l2207ec98c0364392bc2891d8ae985094"></a><a name="l2207ec98c0364392bc2891d8ae985094"></a>Description: Removes the longest string containing only bytes from <strong id="EN-US_TOPIC_0000001145830649__b8423527069119">bytes</strong> from the start and end of <strong id="EN-US_TOPIC_0000001145830649__b84235270691116">string</strong>.</p>
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<p id="EN-US_TOPIC_0000001145830649__af843e408d4c24aa8b1a62ef395c9938a">Return type: bytea</p>
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<p id="EN-US_TOPIC_0000001145830649__ae04a82820d3c4a4b9412f8f83d99891c">For example:</p>
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<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001145830649__s56c352fc33de4772b098880961856104"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
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<span class="normal">2</span>
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<span class="normal">3</span>
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<span class="normal">4</span>
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<span class="normal">5</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="k">trim</span><span class="p">(</span><span class="n">E</span><span class="s1">'\\000'</span><span class="p">::</span><span class="n">bytea</span><span class="w"> </span><span class="k">from</span><span class="w"> </span><span class="n">E</span><span class="s1">'\\000Tom\\000'</span><span class="p">::</span><span class="n">bytea</span><span class="p">)</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="k">RESULT</span><span class="p">;</span><span class="w"></span>
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<span class="w"> </span><span class="k">result</span><span class="w"> </span>
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<span class="c1">----------</span>
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<span class="w"> </span><span class="err">\</span><span class="n">x546f6d</span><span class="w"></span>
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<span class="p">(</span><span class="mi">1</span><span class="w"> </span><span class="k">row</span><span class="p">)</span><span class="w"></span>
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</pre></div></td></tr></table></div>
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</div>
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</li></ul>
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</div>
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<div class="section" id="EN-US_TOPIC_0000001145830649__s78715de5f02f454cab961a772ef7d138"><h4 class="sectiontitle">Other Binary String Functions</h4><p id="EN-US_TOPIC_0000001145830649__a436ab2ceddd44524ae653478b335b97f"><span id="EN-US_TOPIC_0000001145830649__text625811735">GaussDB(DWS)</span> also provides the common syntax used for invoking functions.</p>
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<ul id="EN-US_TOPIC_0000001145830649__u6271902f7bab42e281cc05d1fd568fdb"><li id="EN-US_TOPIC_0000001145830649__l47e0c674165d42dd8074210ee7c6209a">btrim(string bytea,bytes bytea)<p id="EN-US_TOPIC_0000001145830649__abdff5d69b30246039260e6243cfacb74"><a name="EN-US_TOPIC_0000001145830649__l47e0c674165d42dd8074210ee7c6209a"></a><a name="l47e0c674165d42dd8074210ee7c6209a"></a>Description: Removes the longest string containing only bytes from <strong id="EN-US_TOPIC_0000001145830649__b1045394505">bytes</strong> from the start and end of <strong id="EN-US_TOPIC_0000001145830649__b1363979455">string</strong>.</p>
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<p id="EN-US_TOPIC_0000001145830649__ab5395291b1b54fbfa3f102a8cd3d4a08">Return type: bytea</p>
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<p id="EN-US_TOPIC_0000001145830649__aee1d2708609e4666b9262c30bbda11d9">For example:</p>
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<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001145830649__se545f86f344f4181acf2ae49ba2962fb"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
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<span class="normal">2</span>
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<span class="normal">3</span>
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<span class="normal">4</span>
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<span class="normal">5</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="n">btrim</span><span class="p">(</span><span class="n">E</span><span class="s1">'\\000trim\\000'</span><span class="p">::</span><span class="n">bytea</span><span class="p">,</span><span class="w"> </span><span class="n">E</span><span class="s1">'\\000'</span><span class="p">::</span><span class="n">bytea</span><span class="p">)</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="k">RESULT</span><span class="p">;</span><span class="w"></span>
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<span class="w"> </span><span class="k">result</span><span class="w"> </span>
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<span class="c1">------------</span>
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<span class="w"> </span><span class="err">\</span><span class="n">x7472696d</span><span class="w"></span>
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<span class="p">(</span><span class="mi">1</span><span class="w"> </span><span class="k">row</span><span class="p">)</span><span class="w"></span>
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</pre></div></td></tr></table></div>
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</div>
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</li><li id="EN-US_TOPIC_0000001145830649__l8772178689d8496598d6a75c73acde17">get_bit(string, offset)<p id="EN-US_TOPIC_0000001145830649__a1cb86ec632c3464eb9531b91405603f6"><a name="EN-US_TOPIC_0000001145830649__l8772178689d8496598d6a75c73acde17"></a><a name="l8772178689d8496598d6a75c73acde17"></a>Description: Extracts bit from string.</p>
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<p id="EN-US_TOPIC_0000001145830649__a638868c159e54544a1807fb81294e423">Return type: int</p>
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<p id="EN-US_TOPIC_0000001145830649__afe012251eef2445eaa1fd83dc0249fb3">For example:</p>
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<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001145830649__s4343d0130cc240619d77e977e954c6d5"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
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<span class="normal">2</span>
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<span class="normal">3</span>
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<span class="normal">4</span>
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<span class="normal">5</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="n">get_bit</span><span class="p">(</span><span class="n">E</span><span class="s1">'Th\\000omas'</span><span class="p">::</span><span class="n">bytea</span><span class="p">,</span><span class="w"> </span><span class="mi">45</span><span class="p">)</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="k">RESULT</span><span class="p">;</span><span class="w"> </span>
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<span class="w"> </span><span class="k">result</span><span class="w"></span>
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<span class="c1">--------</span>
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<span class="w"> </span><span class="mi">1</span><span class="w"></span>
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<span class="p">(</span><span class="mi">1</span><span class="w"> </span><span class="k">row</span><span class="p">)</span><span class="w"></span>
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</pre></div></td></tr></table></div>
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</div>
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</li><li id="EN-US_TOPIC_0000001145830649__l2e2f3a247670401ebb726fc7a65f2735">get_byte(string, offset)<p id="EN-US_TOPIC_0000001145830649__a4072a2c7c64143a899930320b0922cb4"><a name="EN-US_TOPIC_0000001145830649__l2e2f3a247670401ebb726fc7a65f2735"></a><a name="l2e2f3a247670401ebb726fc7a65f2735"></a>Description: Extracts byte from string.</p>
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<p id="EN-US_TOPIC_0000001145830649__aec96cf2804704aee80aefaa65a241ebd">Return type: int</p>
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<p id="EN-US_TOPIC_0000001145830649__a76ec2a5891fc4528859f518cbeb7022b">For example:</p>
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<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001145830649__s1ce953a3c8164bb897006055810c6ed8"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
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<span class="normal">2</span>
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<span class="normal">3</span>
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<span class="normal">4</span>
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<span class="normal">5</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="n">get_byte</span><span class="p">(</span><span class="n">E</span><span class="s1">'Th\\000omas'</span><span class="p">::</span><span class="n">bytea</span><span class="p">,</span><span class="w"> </span><span class="mi">4</span><span class="p">)</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="k">RESULT</span><span class="p">;</span><span class="w"> </span>
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<span class="w"> </span><span class="k">result</span><span class="w"></span>
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<span class="c1">--------</span>
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<span class="w"> </span><span class="mi">109</span><span class="w"></span>
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<span class="p">(</span><span class="mi">1</span><span class="w"> </span><span class="k">row</span><span class="p">)</span><span class="w"></span>
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</pre></div></td></tr></table></div>
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</div>
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</li><li id="EN-US_TOPIC_0000001145830649__l41ef9240588b4a4e8126e1937ff1070d">set_bit(string,offset, newvalue)<p id="EN-US_TOPIC_0000001145830649__a6f97cb962fbd4ab6aee3088ae6a1f8a3"><a name="EN-US_TOPIC_0000001145830649__l41ef9240588b4a4e8126e1937ff1070d"></a><a name="l41ef9240588b4a4e8126e1937ff1070d"></a>Description: Sets bit in string.</p>
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<p id="EN-US_TOPIC_0000001145830649__a11a2afd08f1648b1a2086a8b6051e6f7">Return type: bytea</p>
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<p id="EN-US_TOPIC_0000001145830649__a65229d75914a4f1e8d49e9fec204b579">For example:</p>
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<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001145830649__se9cfa8cd9f0f445ab032b728ad6f1684"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
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<span class="normal">2</span>
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<span class="normal">3</span>
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<span class="normal">4</span>
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<span class="normal">5</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="n">set_bit</span><span class="p">(</span><span class="n">E</span><span class="s1">'Th\\000omas'</span><span class="p">::</span><span class="n">bytea</span><span class="p">,</span><span class="w"> </span><span class="mi">45</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">)</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="k">RESULT</span><span class="p">;</span><span class="w"> </span>
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<span class="w"> </span><span class="k">result</span><span class="w"> </span>
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<span class="c1">------------------</span>
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<span class="w"> </span><span class="err">\</span><span class="n">x5468006f6d4173</span><span class="w"></span>
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<span class="p">(</span><span class="mi">1</span><span class="w"> </span><span class="k">row</span><span class="p">)</span><span class="w"></span>
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</pre></div></td></tr></table></div>
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</div>
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</li><li id="EN-US_TOPIC_0000001145830649__lc1873dc00f9d4736b46814ea8c91bf9b">set_byte(string,offset, newvalue)<p id="EN-US_TOPIC_0000001145830649__a8201800073654cfda5a3f6b8c83d8042"><a name="EN-US_TOPIC_0000001145830649__lc1873dc00f9d4736b46814ea8c91bf9b"></a><a name="lc1873dc00f9d4736b46814ea8c91bf9b"></a>Description: Sets byte in string.</p>
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<p id="EN-US_TOPIC_0000001145830649__a11b85ba31b594bec89f2f1366e0ae181">Return type: bytea</p>
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<p id="EN-US_TOPIC_0000001145830649__a5f937c1661224b64b34adeb24a8fd199">For example:</p>
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<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001145830649__s5e5c779cbf0d4eb0af2b46e115051d70"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
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<span class="normal">2</span>
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<span class="normal">3</span>
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<span class="normal">4</span>
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<span class="normal">5</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="n">set_byte</span><span class="p">(</span><span class="n">E</span><span class="s1">'Th\\000omas'</span><span class="p">::</span><span class="n">bytea</span><span class="p">,</span><span class="w"> </span><span class="mi">4</span><span class="p">,</span><span class="w"> </span><span class="mi">64</span><span class="p">)</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="k">RESULT</span><span class="p">;</span><span class="w"> </span>
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<span class="w"> </span><span class="k">result</span><span class="w"> </span>
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<span class="c1">------------------</span>
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<span class="w"> </span><span class="err">\</span><span class="n">x5468006f406173</span><span class="w"></span>
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<span class="p">(</span><span class="mi">1</span><span class="w"> </span><span class="k">row</span><span class="p">)</span><span class="w"></span>
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</pre></div></td></tr></table></div>
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</div>
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</li></ul>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="dws_06_0027.html">Functions and Operators</a></div>
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</div>
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</div>
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