Returning the First Non NULL Value in a List of Expressions : COALESCE « Data Convert Functions « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Data Convert Functions » COALESCE

13. 2. 2. Returning the First Non NULL Value in a List of Expressions


5> DECLARE @Value1 int

6> DECLARE @Value2 int

7> DECLARE @Value3 int

8> SET @Value2 = 22

9> SET @Value3 = 955

10> SELECT COALESCE(@Value1, @Value2, @Value3)

11> GO



-----------

         22



(1 rows affected)

1>

13. 2. COALESCE
	13. 2. 1.	COALESCE is equivalent to a CASE expression that returns the first NOT NULL expression in a list of expressions.
	13. 2. 2.	Returning the First Non NULL Value in a List of Expressions
	13. 2. 3.	COALESCE() saves quite a lot of IF or CASE decision logic.
	13. 2. 4.	A SELECT statement that uses the COALESCE function
	13. 2. 5.	A SELECT statement that substitutes a different data type

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