6 SQL Query Management

You can use a query to retrieve data from one or more tables. A query is a statement that consists of zero or more variable declarations followed by single SELECT expression. The result of a query is always a sequence of records having the same record type.


Subqueries are not supported in Oracle NoSQL Database.

Variable declarations and expressions will be defined later in this chapter. Before doing so, a few general concepts and related terminology must be established first.