Null Conditions

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

null_conditions::=

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Description of the illustration null_conditions.gif

Table 7-9 lists the null conditions.

Table 7-9 Null Conditions

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;