REVERSE (Transact-SQL)

string_expression

string_expression is an expression of a string or binary data type. string_expression can be a constant, variable, or column of either character or binary data.

varchar or nvarchar

string_expression must be of a data type that is implicitly convertible to varchar. Otherwise, use CAST to explicitly convert string_expression.

Supplementary Characters (Surrogate Pairs)

The following example returns all contact first names with the characters reversed.

USE AdventureWorks2012;
GO
SELECT FirstName, REVERSE(FirstName) AS Reverse
FROM Person.Person
WHERE BusinessEntityID < 5
ORDER BY FirstName;
GO

Here is the result set.

FirstName Reverse

-------------- --------------

Ken neK

Rob boR

Roberto otreboR

Terri irreT

(4 row(s) affected)

The following example reverses the characters in a variable.

DECLARE @myvar varchar(10)
SET @myvar = 'sdrawkcaB'
SELECT REVERSE(@myvar) AS Reversed ;
GO

The following example makes an implicit conversion from an int data type into varchar data type and then reverses the result.

SELECT REVERSE(1234) AS Reversed ;
GO

Reference