Does not execute the child operations for any partition
This operation was introduced in Oracle 8.1.5 replacing PARTITION (EMPTY)
This operation is implemented in the following versions
|
This operation has not yet been observed in Oracle 10.2
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) PARTITION BY RANGE (c1) ( PARTITION p1 VALUES LESS THAN (10), PARTITION p2 VALUES LESS THAN (20), PARTITION p3 VALUES LESS THAN (30), PARTITION p4 VALUES LESS THAN (40) );
The table does not need to be analysed
The statement
SELECT c1 FROM t1 WHERE c1 = NULL;
generates the following execution plan
0 SELECT STATEMENT Optimizer=CHOOSE 1 0 PARTITION RANGE (EMPTY) 2 1 TABLE ACCESS (FULL) OF 'T1'
Note that the predicate c1 = NULL is syntactically valid, but semantically meaningless