What does this mean
:=
in sql ?
If found some sql using like that symbol example
select col1, col2, @pv:=col3 as 'col3' from table1
join
(select @pv:=1)tmp
where col1=@pv
what does this symbol mean := in sql
36.4k views Asked by ashTon At
1
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using this: here variable are prepended with an @ sign to suggest
user-defined variable.A variable, without @, is a system variable, which you cannot define yourself.i.e
:=is used as assignment operator like normal=else where.see here:http://dev.mysql.com/doc/refman/5.0/en/user-variables.html
and also see a good post here:MySQL: @variable vs. variable. Whats the difference?