Null Conditions

A NULL condition tests for nulls. This is the only condition that you should use to test for nulls.

null_condition::=

Description of null_condition.eps follows
Description of the illustration null_condition.eps

Table 6-9 lists the null conditions.

Table 6-9 Null Condition

Type of Condition Operation Example 
IS [NOT] NULL

Tests for nulls.

See Also: Nulls

 
SELECT last_name
  FROM employees
  WHERE commission_pct
  IS NULL
  ORDER BY last_name;