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In MySQL, I think you are looking for concat_ws()
:
concat_ws(' ', nullif(namt, ''), nullif(namf, ''), nullif(naml, ''), nullif(nams, ''))
The nullif()
turns the value to NULL
if it is blank. concat_ws()
ignores NULL
values, so you won’t get duplicated spaces.
Source:stackexchange.com