CONCAT(field1, " - ", field2) as field1
there are several ways to deal with NULLs here
check each field individually --
CONCAT( COALESCE(field1,'') , ' - ' , COALESCE(field2,'') )
however, if field1 is NULL, then the result starts with the dash, so...
CONCAT(
COALESCE(CONCAT(field1,' - '),'')
, COALESCE(field2,'') )
which is esthetically better but rather clumsy
my favourite approach --
CONCATE_WS( ' - ' , field1, field2 )
check out CONCAT_WS in the manual for how it works with NULLs
;o)
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