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What is the use of MySQL CONCAT_WS() function?
Basically, MySQL CONCAT_WS() function is used to concatenate two or more strings along with a separator. Here the keyword WS in CONCAT_WS() means WITH SEPARATOR. We can pronounce CONCAT_WS() function as concatenation function with a separator.
Syntax
CONCAT_WS(Separator, String1,String2,…,StringN)
Here, the arguments of CONCAT_WS functions are Separator and the strings which need to be concatenated along with that separator as a single string. Separator except for numeric value must enclose within quotes.
Example
mysql> SELECT CONCAT_WS(' ','New', 'Delhi'); +-------------------------------+ | CONCAT_WS(' ','New', 'Delhi') | +-------------------------------+ | New Delhi | +-------------------------------+ 1 row in set (0.00 sec)
In this example above, we can see that the string ‘ ‘ (i.e. a white space) works as a separator and inserted between two strings, New and Delhi) which needs to be concatenated.
mysql> SELECT CONCAT_WS(' is our ','Delhi','Capital'); +-----------------------------------------+ | CONCAT_WS(' is our ','Delhi','Capital') | +-----------------------------------------+ | Delhi is our Capital | +-----------------------------------------+ 1 row in set (0.00 sec)
In this example above, we can see that the string ‘ is our ‘ works as a separator and inserted between two strings, Delhi and Capital, which needs to be concatenated.