On Fri, 27 Jan 2006, Stefano B. wrote: > Hi, > > I have two identical tables > > table1 (f1,f2,f3,f4 primary key (f1,f2,f3,f4)) > table2 (g1,g2,g3,g4 primary key (g1,g2,g3,g4)) > > How can I find the difference between the two tables? > table1 has 10000 records > table2 has 9900 records (these records are in table1 as well) > > I'd like to find 100 missing records. > I have try this query > > select f1,f2,f3,f4 from table1 where (f1,f2,f3,f4) NOT IN (select f1,f2,f3,f4 from table2) Is there a reason you've used f1-f4 in the table2 subselect rather than g1-g4? From the definitions above, I think the f1-f4 in the subselect are becoming outer references which isn't what you want.
