Concatenating string is one of the most common tasks in SQL Server and every developer has to come across it. We have to concat the string when we have to see the display full name of the person by first name and last name. In this video we will see various methods to concatenate the strings. SQL Server 2012 has introduced new function CONCAT which concatenates the strings much efficiently.
When we concat values with ‘+’ in SQL Server we have to make sure that values are in string format. However, when we attempt to concat integer we have to convert the integers to a string or else it will throw an error. However, with the newly introduce the function of CONCAT in SQL Server 2012 we do not have to worry about this kind of issue. It concatenates strings and integers without casting or converting them. You can specify various values as a parameter to CONCAT functions and it concatenates them together.
Let us see how to concat the values in Sixty Seconds:
Here is the script which is used in the video.
-- Method 1: Concatenating two strings
SELECT 'FirstName' + ' ' + 'LastName' AS FullName
-- Method 2: Concatenating two Numbers
SELECT CAST(1 AS VARCHAR(10)) + ' ' + CAST(2 AS VARCHAR(10))
-- Method 3: Concatenating values of table columns
SELECT FirstName + ' ' + LastName AS FullName
-- Method 4: SQL Server 2012 CONCAT function
SELECT CONCAT('FirstName' , ' ' , 'LastName') AS FullName
-- Method 5: SQL Server 2012 CONCAT function
SELECT CONCAT('FirstName' , ' ' , 1) AS FullName
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Reference: Pinal Dave (http://blog.sqlauthority.com)