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I have searched unsuccessfully for a satisfactory explanation on the difference between GROUP_CONCAT() and CONCAT_WS().
Are they as closely related as I think they are?
What are the differences in usage, speed, etc. between these two functions?
GROUP_CONCATis used when you want to have non-NULL values from different column rows in a single row. For this you need to have GROUP BY to work.CONCAT_WSis to join two or more strings.Example,
GROUP_CONCAT(CONCAT_WS(' ', firstname, lastname) ORDER BY id ASC SEPARATOR ',');Outputs something like,
John Doe,Blah Blah,Tom Cruise,Lorem Ipsumhere space between the name is because of
CONCAT_WS,while whole result in one row is because of
GROUP_CONCAT