Concat With Null Fields In MySQL

Posted By Weston Ganger

I needed to CONCAT a string in MySQL statement but it had null values which where wrecking the statement. Turns out you need to use CONACT_WS instead. This allows NULL values to be treated as empty strings as you would expect

# Fails
CONCAT('', 'foo', 'bar', NULL) = NULL

# Allows any null values
CONCAT_WS('', 'foo', 'bar', NULL) = 'foobar'

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Article Topic:Software Development - Web Development

Date:February 16, 2017