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CONCAT FUNCTION IN SQL SERVER 2012

Concat function is used concatnating the values among the different arguments.

Syntax:
Concat([String1],[String2]..[StringN]); 

DECLARE @FName VARCHAR(50),@LName VARCHAR(50);
SET @FName='Rakesh' ;
SET @LName='Kalluri';
SELECT CONCAT(@FName,' ', @LName) as [FullName];
Output: Rakesh Kalluri

--Before SQL 2012 Versions we can use like this way
DECLARE @FName VARCHAR(50),@LName VARCHAR(50);
SET @FName='Rakesh' ;
SET @LName='Kalluri';
SELECT @FName+' '+@LName as [FullName];
Output: Rakesh Kalluri

--But Before SQL 2012 Versions there are 2 problems when we contacting.
--1.Need to replace NULL Value to Empty.if we directly concat NULL Value the Entire result also NULL.

--Before 2012:
DECLARE @FName VARCHAR(50),@LName VARCHAR(50);
SET @FName='Rakesh' ;
SELECT @FName+' '+@LName as [FullName];
Output: NULL

--From 2012 (Null values are implicitly converted to empty)
DECLARE @FName VARCHAR(50),@LName VARCHAR(50);
SET @FName='Rakesh' ;
SELECT CONCAT(@FName,' ', @LName) as [FullName];
Output: Rakesh

--2.Need to Convert String Datatype

--Before 2012:
DECLARE @FName VARCHAR(50),@Id INT;
SET @FName='Rakesh' ;
SET @Id=1
SELECT @FName+' '+@Id as [Details];
Msg 245, Level 16, State 1, Line 5
Conversion failed when converting the varchar value 'Rakesh ' to data type int.

--Problem Solving Before 2012 Versions
SELECT @FName+' '+CAST(@Id AS VARCHAR(50)) as [Details];
Output: Rakesh 1

--From 2012
DECLARE @FName VARCHAR(50),@Id INT;
SET @FName='Rakesh' ;
SET @Id=1
SELECT CONCAT(@FName,' ', @Id) as [Details];
Output: Rakesh 1


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