PL/SQL Language Constructs

 PL/SQL blocks can include a variety of different PL/SQL language constructs.

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These constructs including the following:

• Variables and constants

  You can declare these constructs within a procedure, function, or package. You can use a variable or constant in a SQL or PL/SQL statement to capture or provide a value when one is needed.
  

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• Cursors

  You can declare a cursor explicitly within a procedure, function, or package to facilitate record-oriented processing of Oracle Database data. The PL/SQL engine can also declare cursors implicitly.

• Exceptions

  PL/SQL lets you explicitly handle internal and user-defined error conditions, called exceptions, that arise during processing of PL/SQL code.
  

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PL/SQL can run dynamic SQL statements whose complete text is not known until run time. Dynamic SQL statements are stored in character strings that are entered into, or built by, the program at run time. This technique enables you to create general purpose procedures. For example, you can create a procedure that operates on a table whose name is not known until run time.

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