I have two tables I'm doing a join with. Table1 has a PK on an id column which is Unique.<BR><BR>Table2 has a PK on two columns, uid,id which is Unique.<BR><BR>If I do a:<BR><BR>SELECT Table1.id, ...

I have a table that links two other tables together. I've defined an index on the first column, and its cardinality ends up being 218 (out of 5000+ rows). If I then ...