Analytic function
This operation was introduced in Oracle 8.1.6
This operation is implemented in the following versions
|
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,r1 FROM ( SELECT c1,RANK () OVER ( PARTITION BY c1 ORDER BY c2 ) AS r1 FROM t1 ) WHERE r1 < 10;
generates the following execution plan
0 SELECT STATEMENT Optimizer=CHOOSE 1 0 VIEW 2 1 WINDOW (SORT PUSHED RANK) 3 2 TABLE ACCESS (FULL) OF 'T1'