Analytic function
This operation was introduced in Oracle 8.1.6
This operation is implemented in the following versions
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This example was developed using Oracle 9.2.0.1 on Windows 2000
This example requires the following table definition
CREATE TABLE t1 (c1 NUMBER,c2 NUMBER);
The table does not need to be analysed
The statement
SELECT VAR_POP (SUM (c1)) OVER (ORDER BY c2) FROM t1 GROUP BY c2;
generates the following execution plan
0 SELECT STATEMENT Optimizer=CHOOSE 1 0 WINDOW (BUFFER) 2 1 SORT (GROUP BY) 3 2 TABLE ACCESS (FULL) OF 'T1'
This example was developed using Oracle 9.2.0.1 on Windows 2000
This example requires the following table definition
CREATE TABLE t1 (c1 NUMBER,c2 NUMBER);
The table does not need to be analysed
The statement
SELECT VAR_SAMP (SUM (c1)) OVER (ORDER BY c2) FROM t1 GROUP BY c2;
generates the following execution plan
0 SELECT STATEMENT Optimizer=CHOOSE 1 0 WINDOW (BUFFER) 2 1 SORT (GROUP BY) 3 2 TABLE ACCESS (FULL) OF 'T1'
This example was developed using Oracle 9.2.0.1 on Windows 2000
This example requires the following table definition
CREATE TABLE t1 (c1 NUMBER,c2 NUMBER);
The table does not need to be analysed
The statement
SELECT c1,RATIO_TO_REPORT (c2) OVER () FROM t1;
generates the following execution plan
0 SELECT STATEMENT Optimizer=CHOOSE 1 0 WINDOW (BUFFER) 2 1 TABLE ACCESS (FULL) OF 'T1'