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Su, Xiaomeng
76a5b1ee83
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com> Co-authored-by: Su, Xiaomeng <suxiaomeng1@huawei.com> Co-committed-by: Su, Xiaomeng <suxiaomeng1@huawei.com>
67 lines
9.1 KiB
HTML
67 lines
9.1 KiB
HTML
<a name="dli_spark_datediff"></a><a name="dli_spark_datediff"></a>
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<h1 class="topictitle1">datediff</h1>
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<div id="body8662426"><p id="dli_spark_datediff__en-us_topic_0000001645795526_p990811211817">This function is used to calculate the difference between <strong id="dli_spark_datediff__en-us_topic_0000001645795526_b7660724406">date1</strong> and <strong id="dli_spark_datediff__en-us_topic_0000001645795526_b1066002134014">date2</strong>.</p>
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<p id="dli_spark_datediff__en-us_topic_0000001645795526_p137084592526">Similar function: <a href="dli_spark_datediff1.html#dli_spark_datediff1">datediff1</a>. The <strong id="dli_spark_datediff__en-us_topic_0000001645795526_b415412131594">datediff1</strong> function is used to calculate the difference between <strong id="dli_spark_datediff__en-us_topic_0000001645795526_b176445162409">date1</strong> and <strong id="dli_spark_datediff__en-us_topic_0000001645795526_b146452164407">date2</strong> and return the difference in a specified datepart.</p>
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<div class="section" id="dli_spark_datediff__en-us_topic_0000001645795526_section45291954203217"><h4 class="sectiontitle">Syntax</h4><pre class="screen" id="dli_spark_datediff__en-us_topic_0000001645795526_screen2121185651218">datediff(string date1, string date2)</pre>
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</div>
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<div class="section" id="dli_spark_datediff__en-us_topic_0000001645795526_section992014913317"><h4 class="sectiontitle">Parameters</h4>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="dli_spark_datediff__en-us_topic_0000001645795526_table1829154762513" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Parameters</caption><thead align="left"><tr id="dli_spark_datediff__en-us_topic_0000001645795526_row8830104792517"><th align="left" class="cellrowborder" valign="top" width="19.220000000000002%" id="mcps1.3.4.2.2.5.1.1"><p id="dli_spark_datediff__en-us_topic_0000001645795526_p983074711252">Parameter</p>
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</th>
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<th align="left" class="cellrowborder" valign="top" width="13.44%" id="mcps1.3.4.2.2.5.1.2"><p id="dli_spark_datediff__en-us_topic_0000001645795526_p6830124732517">Mandatory</p>
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</th>
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<th align="left" class="cellrowborder" valign="top" width="20.61%" id="mcps1.3.4.2.2.5.1.3"><p id="dli_spark_datediff__en-us_topic_0000001645795526_p13318164512614">Type</p>
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</th>
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<th align="left" class="cellrowborder" valign="top" width="46.73%" id="mcps1.3.4.2.2.5.1.4"><p id="dli_spark_datediff__en-us_topic_0000001645795526_p08301547132513">Description</p>
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</th>
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</tr>
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</thead>
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<tbody><tr id="dli_spark_datediff__en-us_topic_0000001645795526_row15830184792511"><td class="cellrowborder" valign="top" width="19.220000000000002%" headers="mcps1.3.4.2.2.5.1.1 "><p id="dli_spark_datediff__en-us_topic_0000001645795526_p683034714250">date1</p>
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</td>
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<td class="cellrowborder" valign="top" width="13.44%" headers="mcps1.3.4.2.2.5.1.2 "><p id="dli_spark_datediff__en-us_topic_0000001645795526_p12830184752518">Yes</p>
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</td>
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<td class="cellrowborder" valign="top" width="20.61%" headers="mcps1.3.4.2.2.5.1.3 "><p id="dli_spark_datediff__en-us_topic_0000001645795526_p2098843181320">DATE</p>
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<p id="dli_spark_datediff__en-us_topic_0000001645795526_p158591444191319">or</p>
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<p id="dli_spark_datediff__en-us_topic_0000001645795526_p0318545102615">STRING</p>
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</td>
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<td class="cellrowborder" valign="top" width="46.73%" headers="mcps1.3.4.2.2.5.1.4 "><p id="dli_spark_datediff__en-us_topic_0000001645795526_p189251333161511">Minuend of the date difference between <strong id="dli_spark_datediff__en-us_topic_0000001645795526_b13601144812432">date1</strong> and <strong id="dli_spark_datediff__en-us_topic_0000001645795526_b94621050184317">date2</strong>.</p>
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<p id="dli_spark_datediff__en-us_topic_0000001645795526_p262017013166">The following formats are supported:</p>
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<ul id="dli_spark_datediff__en-us_topic_0000001645795526_ul18403171617"><li id="dli_spark_datediff__en-us_topic_0000001645795526_li20849331611">yyyy-mm-dd</li><li id="dli_spark_datediff__en-us_topic_0000001645795526_li9841137169">yyyy-mm-dd hh:mi:ss</li><li id="dli_spark_datediff__en-us_topic_0000001645795526_li784203121614">yyyy-mm-dd hh:mi:ss.ff3</li></ul>
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</td>
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</tr>
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<tr id="dli_spark_datediff__en-us_topic_0000001645795526_row52033239362"><td class="cellrowborder" valign="top" width="19.220000000000002%" headers="mcps1.3.4.2.2.5.1.1 "><p id="dli_spark_datediff__en-us_topic_0000001645795526_p34501243193613">date2</p>
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</td>
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<td class="cellrowborder" valign="top" width="13.44%" headers="mcps1.3.4.2.2.5.1.2 "><p id="dli_spark_datediff__en-us_topic_0000001645795526_p132041223183617">Yes</p>
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</td>
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<td class="cellrowborder" valign="top" width="20.61%" headers="mcps1.3.4.2.2.5.1.3 "><p id="dli_spark_datediff__en-us_topic_0000001645795526_p391921217153">DATE</p>
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<p id="dli_spark_datediff__en-us_topic_0000001645795526_p0919121211517">or</p>
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<p id="dli_spark_datediff__en-us_topic_0000001645795526_p129199128158">STRING</p>
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</td>
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<td class="cellrowborder" valign="top" width="46.73%" headers="mcps1.3.4.2.2.5.1.4 "><p id="dli_spark_datediff__en-us_topic_0000001645795526_p720417232361">Subtrahend of the date difference between <strong id="dli_spark_datediff__en-us_topic_0000001645795526_b1862215579443">date1</strong> and <strong id="dli_spark_datediff__en-us_topic_0000001645795526_b11622957174415">date2</strong>.</p>
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<p id="dli_spark_datediff__en-us_topic_0000001645795526_p1029545971519">The following formats are supported:</p>
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<ul id="dli_spark_datediff__en-us_topic_0000001645795526_ul20382959169"><li id="dli_spark_datediff__en-us_topic_0000001645795526_li1038275101615">yyyy-mm-dd</li><li id="dli_spark_datediff__en-us_topic_0000001645795526_li7382195101611">yyyy-mm-dd hh:mi:ss</li><li id="dli_spark_datediff__en-us_topic_0000001645795526_li193822052166">yyyy-mm-dd hh:mi:ss.ff3</li></ul>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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</div>
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<div class="section" id="dli_spark_datediff__en-us_topic_0000001645795526_section210162513312"><h4 class="sectiontitle">Return Values</h4><p id="dli_spark_datediff__en-us_topic_0000001645795526_p136202119551">The return value is of the BIGINT type.</p>
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<div class="note" id="dli_spark_datediff__en-us_topic_0000001645795526_note61422099395"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="dli_spark_datediff__en-us_topic_0000001645795526_ul1419951023915"><li id="dli_spark_datediff__en-us_topic_0000001645795526_li1184311414129">If the values of <strong id="dli_spark_datediff__en-us_topic_0000001645795526_b590816377469">date1</strong> and <strong id="dli_spark_datediff__en-us_topic_0000001645795526_b14724554720">date2</strong> are not of the DATE or STRING type, the error message "data type mismatch" is displayed.</li><li id="dli_spark_datediff__en-us_topic_0000001645795526_li480101212366">If the values of <strong id="dli_spark_datediff__en-us_topic_0000001645795526_b8345620114711">date1</strong> and <strong id="dli_spark_datediff__en-us_topic_0000001645795526_b0493113511479">date2</strong> are of the DATE or STRING type but are not in one of the supported formats, <strong id="dli_spark_datediff__en-us_topic_0000001645795526_b163452208473">NULL</strong> is returned.</li><li id="dli_spark_datediff__en-us_topic_0000001645795526_li1938412582169">If the value of <strong id="dli_spark_datediff__en-us_topic_0000001645795526_b27665379483">date1</strong> is smaller than that of <strong id="dli_spark_datediff__en-us_topic_0000001645795526_b12273194784812">date2</strong>, the return value is a negative number.</li><li id="dli_spark_datediff__en-us_topic_0000001645795526_li1238485811167">If the value of <strong id="dli_spark_datediff__en-us_topic_0000001645795526_b1896131094915">date1</strong> or <strong id="dli_spark_datediff__en-us_topic_0000001645795526_b13971410194911">date2</strong> is <strong id="dli_spark_datediff__en-us_topic_0000001645795526_b1198181012494">NULL</strong>, <strong id="dli_spark_datediff__en-us_topic_0000001645795526_b1981510174913">NULL</strong> is returned.</li></ul>
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</div></div>
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</div>
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<div class="section" id="dli_spark_datediff__en-us_topic_0000001645795526_section13277192233920"><h4 class="sectiontitle">Example Code</h4><p id="dli_spark_datediff__en-us_topic_0000001645795526_p161513271106">The value <strong id="dli_spark_datediff__en-us_topic_0000001645795526_b121822119501">10</strong> is returned.</p>
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<pre class="screen" id="dli_spark_datediff__en-us_topic_0000001645795526_screen178683101014">select datediff('2023-06-30 00:00:00', '2023-06-20 00:00:00');</pre>
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<p id="dli_spark_datediff__en-us_topic_0000001645795526_p1515116275101">The value <strong id="dli_spark_datediff__en-us_topic_0000001645795526_b1560118555508">11</strong> is returned.</p>
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<pre class="screen" id="dli_spark_datediff__en-us_topic_0000001645795526_screen381411356101">select datediff(date '2023-05-21', date '2023-05-10');</pre>
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<p id="dli_spark_datediff__en-us_topic_0000001645795526_p815112731017">The value <strong id="dli_spark_datediff__en-us_topic_0000001645795526_b12057526273179">NULL</strong> is returned.</p>
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<pre class="screen" id="dli_spark_datediff__en-us_topic_0000001645795526_screen17227134011010">select datediff(date '2023-05-21', null);</pre>
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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="dli_08_0471.html">Date Functions</a></div>
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</div>
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</div>
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