What is a Query? A query is a request that is asked in a formal manner. For example, relational databases require the use of a formal structured query language (SQL) to retrieve, modify, or manipulate ...

I just took a test for a state DBA position on DB2/SQL and IMS. One of the questions was something like: "What is the EXPLAIN command and how is it used?"<BR><BR>I almost answered "Honestly, I ...