forked from docs/doc-exports
Lu, Huayi
346ac31da9
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com> Reviewed-by: Jiang, Beibei <beibei.jiang@t-systems.com> Co-authored-by: Lu, Huayi <luhuayi@huawei.com> Co-committed-by: Lu, Huayi <luhuayi@huawei.com>
160 lines
8.8 KiB
HTML
160 lines
8.8 KiB
HTML
<a name="EN-US_TOPIC_0000001188681050"></a><a name="EN-US_TOPIC_0000001188681050"></a>
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<h1 class="topictitle1">Analytical Functions</h1>
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<div id="body8662426"><p id="EN-US_TOPIC_0000001188681050__en-us_topic_0238518399_en-us_topic_0237362180_en-us_topic_0202727311_p8060118">Analytical functions compute an aggregate value based on a group of rows. They differ from aggregate functions in that they return multiple rows for each group. Analytical functions are commonly used to compute cumulative, moving, centered, and reporting aggregates. DSC supports analytical functions including the RATIO_TO_REPORT function.</p>
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<p id="EN-US_TOPIC_0000001188681050__en-us_topic_0238518399_en-us_topic_0237362180_en-us_topic_0202727311_p6585177111"><strong id="EN-US_TOPIC_0000001188681050__en-us_topic_0237712462_b697201417337">Input - <strong id="EN-US_TOPIC_0000001188681050__en-us_topic_0237712462_b11222213336">Analytical Functions</strong></strong></p>
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<pre class="screen" id="EN-US_TOPIC_0000001188681050__en-us_topic_0238518399_en-us_topic_0237362180_en-us_topic_0202727311_screen0989144336">SELECT empno, ename, deptno
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, COUNT(*) OVER() AS cnt
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, AVG(DISTINCT empno) OVER (PARTITION BY deptno) AS cnt_dst
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FROM emp
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ORDER BY empno;</pre>
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<p id="EN-US_TOPIC_0000001188681050__en-us_topic_0238518399_en-us_topic_0237362180_en-us_topic_0202727311_p51051214133320"><strong id="EN-US_TOPIC_0000001188681050__en-us_topic_0237712462_b1210611416334">Output</strong></p>
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<pre class="screen" id="EN-US_TOPIC_0000001188681050__en-us_topic_0238518399_en-us_topic_0237362180_en-us_topic_0202727311_screen1110771410335">WITH aggDistQuery1 AS (
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SELECT
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deptno
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,AVG (
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DISTINCT empno
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) aggDistAlias1
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FROM
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emp
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GROUP BY
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deptno
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) SELECT
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empno
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,ename
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,deptno
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,COUNT( * ) OVER( ) AS cnt
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,(
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SELECT
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aggDistAlias1
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FROM
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aggDistQuery1
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WHERE
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deptno = MigTblAlias.deptno
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) AS cnt_dst
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FROM
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emp MigTblAlias
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ORDER BY
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empno
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;</pre>
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<div class="section" id="EN-US_TOPIC_0000001188681050__en-us_topic_0238518399_en-us_topic_0237362180_en-us_topic_0202727311_section11132185520582"><h4 class="sectiontitle">RATIO_TO_REPORT</h4><p id="EN-US_TOPIC_0000001188681050__en-us_topic_0238518399_en-us_topic_0237362180_en-us_topic_0202727311_p24446155917">RATIO_TO_REPORT is an analytic function which returns the proportion of a value to a group of values.</p>
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</div>
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<p id="EN-US_TOPIC_0000001188681050__en-us_topic_0238518399_en-us_topic_0237362180_en-us_topic_0202727311_p16778172218220"><strong id="EN-US_TOPIC_0000001188681050__en-us_topic_0237712462_b11778162215215">Input - <strong id="EN-US_TOPIC_0000001188681050__en-us_topic_0237712462_b16778182216216">RATIO_TO_REPORT</strong></strong></p>
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<pre class="screen" id="EN-US_TOPIC_0000001188681050__en-us_topic_0238518399_en-us_topic_0237362180_en-us_topic_0202727311_screen8778112211210">SELECT last_name, salary
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, RATIO_TO_REPORT(salary) OVER () AS rr
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FROM employees
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WHERE job_id = 'PU_CLERK';</pre>
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<p id="EN-US_TOPIC_0000001188681050__en-us_topic_0238518399_en-us_topic_0237362180_en-us_topic_0202727311_p87807221228"><strong id="EN-US_TOPIC_0000001188681050__en-us_topic_0237712462_b1578015227218">Output</strong></p>
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<pre class="screen" id="EN-US_TOPIC_0000001188681050__en-us_topic_0238518399_en-us_topic_0237362180_en-us_topic_0202727311_screen137812022426">SELECT last_name, salary
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, salary / NULLIF( SUM (salary) OVER( ), 0 ) AS rr
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FROM employees
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WHERE job_id = 'PU_CLERK';</pre>
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<p id="EN-US_TOPIC_0000001188681050__en-us_topic_0238518399_en-us_topic_0237362180_en-us_topic_0202727311_p6919112114220"></p>
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<p id="EN-US_TOPIC_0000001188681050__en-us_topic_0238518399_en-us_topic_0237362180_en-us_topic_0202727311_p1468320178160"><strong id="EN-US_TOPIC_0000001188681050__b6781029102210">Input - <strong id="EN-US_TOPIC_0000001188681050__b107812942214">RATIO_TO_REPORT</strong></strong><strong id="EN-US_TOPIC_0000001188681050__b97822913224"> with AGGREGATE column in SELECT</strong></p>
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<pre class="screen" id="EN-US_TOPIC_0000001188681050__en-us_topic_0238518399_en-us_topic_0237362180_en-us_topic_0202727311_screen176849171164">SELECT
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Ename
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,Deptno
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,Empno
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,SUM (salary)
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,RATIO_TO_REPORT (
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COUNT( DISTINCT Salary )
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) OVER( PARTITION BY Deptno ) RATIO
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FROM
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emp1
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ORDER BY
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Ename
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,Deptno
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,Empno
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;</pre>
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<p id="EN-US_TOPIC_0000001188681050__en-us_topic_0238518399_en-us_topic_0237362180_en-us_topic_0202727311_p136871217171614"><strong id="EN-US_TOPIC_0000001188681050__en-us_topic_0237712462_b1568771741613">Output</strong></p>
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<pre class="screen" id="EN-US_TOPIC_0000001188681050__en-us_topic_0238518399_en-us_topic_0237362180_en-us_topic_0202727311_screen362718551428">SELECT
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Ename
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,Deptno
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,Empno
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,SUM (salary)
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,COUNT( DISTINCT Salary ) / NULLIF( SUM ( COUNT( DISTINCT Salary ) ) OVER( PARTITION BY Deptno ) ,0 ) RATIO
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FROM
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emp1
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ORDER BY
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Ename
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,Deptno
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,Empno
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;</pre>
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<p id="EN-US_TOPIC_0000001188681050__en-us_topic_0238518399_en-us_topic_0237362180_en-us_topic_0202727311_p5272135916218"><strong id="EN-US_TOPIC_0000001188681050__en-us_topic_0237712462_b11272759928">Input - <strong id="EN-US_TOPIC_0000001188681050__en-us_topic_0237712462_b72736592215">RATIO_TO_REPORT</strong></strong><strong id="EN-US_TOPIC_0000001188681050__en-us_topic_0237712462_b1916514381867"> with the AGGREGATE column using extending grouping feature but </strong><strong id="EN-US_TOPIC_0000001188681050__en-us_topic_0237712462_b10605910152916">OUNT (Salary) in the RATIO TO REPORT column</strong> <strong id="EN-US_TOPIC_0000001188681050__en-us_topic_0237712462_b12165938968">is not present in SELECT</strong></p>
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<p id="EN-US_TOPIC_0000001188681050__en-us_topic_0238518399_en-us_topic_0237362180_en-us_topic_0202727311_p196411359410">Use the <strong id="EN-US_TOPIC_0000001188681050__en-us_topic_0237712462_b99161233172310"><a href="dws_mt_0027.html#EN-US_TOPIC_0000001188202590__en-us_topic_0218440495_li121341415427">extendedGroupByClause</a></strong> configuration parameter to configure migration of the extended GROUP BY clause.</p>
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<pre class="screen" id="EN-US_TOPIC_0000001188681050__en-us_topic_0238518399_en-us_topic_0237362180_en-us_topic_0202727311_screen6273559427">SELECT
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Ename
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,Deptno
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,Empno
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,SUM (salary)
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,RATIO_TO_REPORT (
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COUNT( Salary )
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) OVER( PARTITION BY Deptno ) RATIO
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FROM
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emp1
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GROUP BY
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GROUPING SETS (
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Ename
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,Deptno
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,Empno
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)
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ORDER BY
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Ename
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,Deptno
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,Empno
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;</pre>
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<p id="EN-US_TOPIC_0000001188681050__en-us_topic_0238518399_en-us_topic_0237362180_en-us_topic_0202727311_p6276859120"><strong id="EN-US_TOPIC_0000001188681050__b298559365">Output</strong></p>
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<pre class="screen" id="EN-US_TOPIC_0000001188681050__en-us_topic_0238518399_en-us_topic_0237362180_en-us_topic_0202727311_screen427775914210">SELECT
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Ename
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,Deptno
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,Empno
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,ColumnAlias1
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,aggColumnalias1 / NULLIF( SUM ( aggColumnalias1 ) OVER( PARTITION BY Deptno ) ,0 ) RATIO
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FROM
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(
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SELECT
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SUM (salary) AS ColumnAlias1
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,COUNT( Salary ) aggColumnalias1
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,NULL AS Deptno
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,NULL AS Empno
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,Ename
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FROM
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emp1
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GROUP BY
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Ename
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UNION
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ALL SELECT
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SUM (salary) AS ColumnAlias1
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,COUNT( Salary ) aggColumnalias1
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,Deptno
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,NULL AS Empno
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,NULL AS Ename
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FROM
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emp1
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GROUP BY
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Deptno
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UNION
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ALL SELECT
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SUM (salary) AS ColumnAlias1
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,COUNT( Salary ) aggColumnalias1
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,NULL AS Deptno
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,Empno
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,NULL AS Ename
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FROM
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emp1
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GROUP BY
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Empno
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)
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ORDER BY
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Ename
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,Deptno
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,Empno
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;</pre>
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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_mt_0133.html">System Functions</a></div>
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</div>
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</div>
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