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You use three commands to control a cursor: You must declare a cursor before referencing it in other statements.

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You can manipulate Oracle data flexibly and safely because PL/SQL fully supports all SQL data manipulation statements (except ), transaction control statements, functions, pseudocolumns, and operators.

PL/SQL also conforms to the current ANSI/ISO SQL standard.

You might use sequence numbers to give each row a unique identifier, and refer to those identifiers from other rows to set up parent-child relationships. PL/SQL declares a cursor implicitly for all SQL data manipulation statements, including queries that return only one row.

If you want precise control over query processing, you can declare an explicit cursor in the declarative part of any PL/SQL block, subprogram, or package.

In addition to static SQL discussed in this chapter, PL/SQL also supports dynamic SQL, which enables you to execute SQL data definition, data control, and session control statements dynamically.