![]() In T-SQL, if the separator is a NULL value, the the string values are still concatenated, but without a separator. This is one of the differences between MySQL and T-SQL (SQL Server, Azure). If you now insert a null value, the command reads like this: bash. In this case you’ll notice that the output is a simple MySQLCONCAT. ![]() First, we’ll simply join two strings together. For example, if a parameter is numeric, it will be converted into a string as part of the concatenation. To understand how MySQL CONCAT works, it’s worth looking at a few simple examples. The parameters don't necessarily need to be strings themselves. CONCAT () returns the string that results from concatenating its parameters. If the separator itself is a NULL value, the concatenation operation will return NULL.Įxample: SELECT CONCAT_WS(NULL,'Auckland', NULL, 'New Zealand') AS Location The CONCAT () function allows you to concatenate two or more parameters. ![]() Use this: CONCAT (name, ' ', surname) This functionality is documented quite clearly on the MySQL manual page for the CONCAT () function. If any of the arguments is a NULL value, MySQL will skip that value and its separator, but it will still process the others.Įxample: SELECT CONCAT_WS(', ','Auckland', NULL, 'New Zealand') AS Location You can concatenate string literals along with your fields, so you can add a space character in a string between the fields you're concatenating. Here’s an example of retrieving data from a database, and combining two columns into one, separated by a comma: SELECT CONCAT_WS(', ', city.Name, country.Name ) AS Location SELECT CONCAT_WS(' - ','Paris', 'France') AS Location Here’s the same example as the previous one, except this one uses a different separator. There’s nothing to say that the separator must be a comma. Here’s an example: SELECT CONCAT_WS(',','Sydney', 'Australia') AS Location Īnd you can add a space in there if you want: SELECT CONCAT_WS(', ','Sydney', 'Australia') AS Location If you just use the CONCAT() function, you’d have no separator (unless you explicitly added a separator as an argument between each string argument).Ī common usage of the CONCAT_WS() function is to create a comma-delimited list. In MySQL, the CONCAT_WS() function allows you to add a separator to concatenated strings.
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