IF statement

An IF statement evaluates a condition and executes either one of two statements depending on the result. You can nest IF statements to create complex branching logic. A dependent ELSE statement will execute its statement only if the IF statement evaluates to false.

Usage
IF (criteria)
   block
[ELSE
   block]
END
Example IF statement
IF ( var1 = 'North America')
BEGIN
  ...statement...
END ELSE
BEGIN
  ...statement...
END

The criteria can be any valid Boolean expression or an IS DISTINCT FROM predicate referencing row values. The IS DISTINCT FROM extension uses the following syntax:

rowVal IS [NOT] DISTINCT FROM rowValOther

Where rowVal and rowValOther are references to row value group. This would typically be used in instead of update triggers on views to quickly determine if the row values are changing:

Example: IS DISTINCT FROM IF statement
IF ( "new" IS DISTINCT FROM "old")
BEGIN
  ...statement...
END

IS DISTINCT FROM considers null values equivalent and never produces an UNKNOWN value.

Tip
 Null values should be considered in the criteria of an IF statement. IS NULL criteria can be used to detect the presence of a null value.

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