Variables Based on Database Columns : TYPE « PL SQL Data Types « Oracle PL/SQL Tutorial

Oracle PL/SQL Tutorial
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Oracle PL/SQL Tutorial » PL SQL Data Types » TYPE 
21. 28. 1. Variables Based on Database Columns

You base a declaration on a table column without having to know definitively what that column's datatype is.

Your variables will automatically be changed as the table column.

You use the %type attribute in variable declarations to define variable based on table column.

avg_rate    employee.pay_rate%type</th>
dept_id     INTEGER;</td>
sub_dept_id dept_id%type;  -- datatype based on a variable</td>
area_id     dept_id%type := 9141; -- used with an initialization clause</td>
21. 28. TYPE
21. 28. 1. Variables Based on Database Columns
21. 28. 2. PL/SQL allows you to use the %type attribute in a nesting variable declaration.
21. 28. 3. You may also specify a variable's type using the %TYPE keyword, which tells PL/SQL to use the same type as a specified column in a table.
21. 28. 4. The %TYPE Command Illustrated
21. 28. 5. Using %TYPE and %ROWTYPE on Row Objects
21. 28. 6. Column type parameters
21. 28. 7. Select value into a column type variable
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