CASE Statements
CASE statements are similar to IF statements, but instead of creating outputs based on tests, the values within an expression are evaluated, and if they match with a given value, then the statement outputs the corresponding result. The WHEN, THEN, ELSE, and END keywords are required and CASE statements are formatted as follows:
CASE expr
WHEN value1 THEN output1
[WHEN value THEN output]
[ELSE defaultoutput]
END
An example using the field with the values 1, null, and 3 is given here:
CASE [Field]
WHEN 1 THEN 1
WHEN 3 THEN -3
ELSE 0
END
This would return 1 for the value 1, 0 for the null value, and -3 for the value 3.
Writing a CASE Statement
In this section, you will create a CASE statement. This will help you understand the difference in syntax when compared to an IF statement.
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