Using default values on database columns helps to insulate database design issues from application code. Find out how to change a column's default value at a later date using a single command.

On the surface, it may appear that the SQL clauses IN and EXISTS are interchangeable. However, they’re quite different in how they handle NULL values and may give different results. The problem ...

Open SQL*PLUS and log in to Oracle. Select the row last inserted into the Oracle database using the "ROWNUM" command.