Am 27. November 2016 11:13:33 MEZ, schrieb John English <john.fore...@gmail.com>: >I'm trying to find all rows in a table where a pair of values is not in > >anther table: that is, I want to do something like this: > > SELECT * FROM x WHERE (a,b) NOT IN (SELECT DISTINCT a,b FROM y); > >which of course doesn't work. > >At the moment I've bodged around it by doing this: > > SELECT * FROM x WHERE a||'-'||b NOT IN (SELECT DISTINCT a||'-'||b >FROM y); > >but this strikes me as really ugly. Can anyone a more elegant way to >get >what I want? > >TIA,
Hi, Can this problem be solved by an correlating sub select?! Maybe something like this: Select * from x where not exists ( select 1 from y where x.a = y.a and x.b = y.b ) Or like your first SQL but convert to string and concatenate that would work but probably very slow as no index could be used. With kind regards Thomas
