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SQL Server 2012: New Logical Functions IIF and CHOOSE

There are the two new logical functions in SQL Server 2012:
1.       IIF() Function
2.       Choose() Function

IIF Logical Function: The IIF function, which is available in SQL Server 2012, returns one of the two values depending upon whether the Boolean expression evaluates to either True or False.

DECLARE @Value1 INT = 10
DECLARE @Value2 INT = 20
SELECT IIF ( @Value1 > @Value2 , 'TRUE', 'FALSE' ) AS IIFResult

And result will be:

CHOOSE Logical Function: The CHOOSE function is used to return the value out of a list based on specified index number. You can think of it as an array kind of thing. The Index number here starts from 1.

Some points about Choose function:
·         If an index value exceeds the bound of the array it returns NULL
·         If the index value is negative then that exceeds the bounds of the array therefore it returns NULL
·         If the provided index value has a float data type other than int, then the value is implicitly converted to an integer

Example: In the example I’ll show results with all the above mentioned points:
--Test Choose function
SELECT CHOOSE(2, 'Sachin','Sandeep', 'Raman', 'Shivanshu') AS 'My Name'
--Test Choose with index value exceeds the bound of the array
SELECT CHOOSE(5, 'Sachin','Sandeep', 'Raman', 'Shivanshu') AS 'IndexExceeds'
--Test Choose with negative index value (it exceeds the bound of the array)
SELECT CHOOSE(-1, 'Sachin','Sandeep', 'Raman', 'Shivanshu') AS 'NegativeIndex'
--Test Choose with decimal index value (automatically converted to Int)
SELECT CHOOSE(2.5, 'Sachin','Sandeep', 'Raman', 'Shivanshu') AS 'DecimalIndex'

And here is the Result of all queries:

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