The WHERE clause or ON clause contains the conditions (sql-expression) under which the rows in the Cartesian product are kept or eliminated in the result table. WHERE is used to select rows from inner ...

In this SQL Server tip, Arthur Fuller explains the effects of NULLs, and the different results obtained by inner and outer JOINs.

This example illustrates a left outer join of the PROCLIB.PAYROLL and PROCLIB.PAYROLL2 tables. proc sql outobs=10; title 'Most Current Jobcode and Salary Information'; select p.IdNumber, p.Jobcode, ...

I need to form the equivalent of a Union Join in Oracle 8i, even though a Union Join doesn't appear to be supported in 8i. I might be able to manipulate a Full Outer Join to get the results I need ...