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CONCAT() function in SQL Server

Last Updated : 28 Dec, 2020

This function in SQL Server helps to concatenate two or more strings together. CONCAT() function can accept a minimum of 2 parameters and a maximum of 254 parameters.

CONCAT(string_1, string_2, .......string_n)

• string_1, string_2, .......string_n - The given strings which need to be concatenated.

The function concatenates all the given string and returns them as one whole string.

• SQL Server 2017
• SQL Server 2016
• SQL Server 2014
• SQL Server 2012

The general working of

CONCAT() function.

• Concatenating 3 strings together with space in between -

  SELECT CONCAT('PYTHON', ' ', 'is', ' ', 'fun!!!') 
  As Combined;

  Output : Combined PYTHON is fun!!!
• Concatenating more than 3 strings together -

  SELECT CONCAT
  ('Every', 'next', 'level', 'of', 'your', 'life', 'demands', 'a', 'new', 'you!') 
  As Combined;

  Output : Combined Everynextlevelofyourlifedemandsanewyou!

Using a variable with CONCAT() function, we assign the strings to variables and then concatenate them.

DECLARE @Str1 AS VARCHAR(100)='Think'
DECLARE @Str2 AS VARCHAR(100)='-'
DECLARE @Str3 AS VARCHAR(100)='green'
DECLARE @Str4 AS VARCHAR(100)=' '
DECLARE @Str5 AS VARCHAR(100)='Be'
DECLARE @Str6 AS VARCHAR(100)='-'
DECLARE @Str7 AS VARCHAR(100)='green'

SELECT CONCAT(@Str1, @Str2, @Str3, @str4, @str5, @str6, @str7) AS Combined;

Concatenating numerical expression using CONCAT() function, here in place of string we combined numeric values.

SELECT CONCAT(13, 03, 1999) 
AS Combined;

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