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Data Vault SQL Reference

6.5
- 6.5.1
- 6.5 HotFix 1
- 6.4.4
- 6.4.3 HotFix 1
- 6.4.3

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NULLIF

Returns a null value if the arguments are equal, otherwise it returns the value of the first argument.

NULLIF Example

SELECT item, NULLIF(cost, -1)
FROM inventory;

For this example, say that a cost value of -1 indicates no cost at all. With the .NULLS system variable set to ‘N/A’, it might be more informative to return a null value instead of -1. Using the NULLIF function, a null value can be substituted for every return of -1.

The equivalent (simple) CASE expression for this example would be the following:

SELECT item, 
       CASE cost
          WHEN -1 THEN NULL
          ELSE cost
       END
FROM inventory;

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Data Vault SQL Reference

Data Vault SQL Reference

NULLIF

NULLIF

NULLIF Example