On 7 Nov 2009, at 10:56pm, Kristoffer Danielsson wrote: > SELECT SUM(Salary - TotalSpent) / 100 FROM (T2 NATURAL JOIN T4) > NATURAL JOIN (T2 NATURAL JOIN T3); > > Error: Ambigious column name: Salary > > However, if I add two parentheses around "T2 NATURAL JOIN T4", the > error goes away: > > SELECT SUM(Salary - TotalSpent) / 100 FROM ((T2 NATURAL JOIN T4)) > NATURAL JOIN (T2 NATURAL JOIN T3); > > Why is this so?
Because there's no longer any reason to wonder if the Salary column could come from T2 NATURAL JOIN T4: you haven't referred to either of them directly. Another way to get rid of the error message would be to specify T2.Salary or T3.Salary. Simon. _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
