IIF keyword is available in SQL Server 2012 and earlier
version. This function takes three arguments, the first argument is the Boolean expression
which evaluates true or false and return one case from another two cases.
It is just like CASE statement in SQL Server you may say IIF is a short form of
CASE.
Syntax:
In the above example, we are evaluating UserType if any user ordered more than 10 times from our site then he is Golden User otherwise user is Silver User.
2-CREATE TABLE #TBL
In the above example, we are listing the user's account created month.
Syntax:
IIF ( boolean_expression, true_value, false_value )
Example:
SELECT IIF(5>4, 'TRUE','FALSE') as Result
Result
TRUE
How to use IIF in SQL
Query
CREATE TABLE #TBL
(
ID INT IDENTITY(1,1),
FName VARCHAR(50),
LName VARCHAR(50),
TotalOrder INT,
CreatedDate DATETIME
)
INSERT INTO #TBL(FName,LName,TotalOrder,CreatedDate)
SELECT 'Dilip','Singh',10,'2015/02/12'
UNION ALL
SELECT 'Raj','Kumar',20,'2015/01/10'
SELECT FName,LName,IIF(TotalOrder>10,'Golden','Silver') AS UserType,CONVERT(DATE,CreatedDate) AS CreatedDate FROM #TBL
DROP TABLE #TBL
Result:
In the above example, we are evaluating UserType if any user ordered more than 10 times from our site then he is Golden User otherwise user is Silver User.
CHOOSE Function In
SQL Server
Choose function was introduced in SQL Server 2012, Choose the function returns the item at the specified index from the list of the value which are
available.
Syntax:
CHOOSE ( index, val_1, val_2 [, val_n ] )
Example:
1-SELECT CHOOSE(1,'January','February','March','April','May','June','July','August','September','October','November','December')AS MONTH
UNION ALL
SELECT CHOOSE(2,'January','February','March','April','May','June','July','August','September','October','November','December')AS MONTH
UNION ALL
SELECT CHOOSE(3,'January','February','March','April','May','June','July','August','September','October','November','December')AS MONTH
UNION ALL
SELECT CHOOSE(4,'January','February','March','April','May','June','July','August','September','October','November','December')AS MONTH
UNION ALL
SELECT CHOOSE(5,'January','February','March','April','May','June','July','August','September','October','November','December')AS MONTH
UNION ALL
SELECT CHOOSE(6,'January','February','March','April','May','June','July','August','September','October','November','December')AS MONTH
UNION ALL
SELECT CHOOSE(7,'January','February','March','April','May','June','July','August','September','October','November','December')AS MONTH
UNION ALL
SELECT CHOOSE(8,'January','February','March','April','May','June','July','August','September','October','November','December')AS MONTH
UNION ALL
SELECT CHOOSE(9,'January','February','March','April','May','June','July','August','September','October','November','December')AS MONTH
UNION ALL
SELECT CHOOSE(10,'January','February','March','April','May','June','July','August','September','October','November','December')AS MONTH
UNION ALL
SELECT CHOOSE(11,'January','February','March','April','May','June','July','August','September','October','November','December')AS MONTH
UNION ALL
SELECT CHOOSE(12,'January','February','March','April','May','June','July','August','September','October','November','December')AS MONTH
2-CREATE TABLE #TBL
(
ID INT IDENTITY(1,1),
FName VARCHAR(50),
LName VARCHAR(50),
TotalOrder INT,
CreatedDate DATETIME
)
INSERT INTO #TBL(FName,LName,TotalOrder,CreatedDate)
SELECT 'Dilip','Singh',10,'2015/02/12'
UNION ALL
SELECT 'Raj','Kumar',20,'2015/01/10'
SELECT FName,LName,IIF(TotalOrder>10,'Golden','Silver') AS UserType,CHOOSE(DATEPART(MM,CreatedDate),'January','February','March','April','May','June',
'July','August','September','October','November','December') AS CreatedMonth FROM #TBL
DROP TABLE #TBL
In the above example, we are listing the user's account created month.