FOR Loops : For LOOP « PL SQL Statements « Oracle PL/SQL Tutorial






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  2. PL SQL Statements
  3. For LOOP

A FOR loop runs a predetermined number of times.

The syntax for a FOR loop is as follows:

FOR loop_variable IN [REVERSE] lower_bound..upper_bound LOOP
  statements
END LOOP;

where

  1. loop_variable specifies the loop variable.
  2. REVERSE specifies that the loop variable value is to be decremented each time through the loop.
  3. lower_bound specifies the loop's lower bound.
  4. upper_bound specifies the loop's upper bound.
  5. If REVERSE is used, the loop variable is initialized to this upper bound.
SQL>
SQL> set serveroutput on
SQL> BEGIN
  2          FOR just_a_num IN 1..10
  3          LOOP
  4                  dbms_output.put_line(just_a_num);
  5          END LOOP;
  6  END;
  7  /
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PL/SQL procedure successfully completed.

SQL>








22.4.For LOOP
22.4.1.FOR Loops
22.4.2.FOR LOOP with loop counter
22.4.3.Nested FOR LOOP with Labels
22.4.4.Nested FOR loop counter
22.4.5.Nested three level LOOP
22.4.6.Reversed FOR LOOP
22.4.7.The upper or lower bounds of the FOR loop can be defined as variables or functions.
22.4.8.Nested IF statement in For loop
22.4.9.Use FOR LOOP to loop through dates
22.4.10.EXIT a FOR LOOP with exit command
22.4.11.FOR Loop Scoping Rules
22.4.12.FOR Loop Ranges
22.4.13.LOOP with Labels
22.4.14.A complete example if uisng the cursor variable using a cursor FOR LOOP
22.4.15.FOR year_number IN 1800..1995: define variable for a range type
22.4.16.Drop any objects to make script re-runnable: for in
22.4.17.For loop variable in a range of numbers
22.4.18.Reversed loop
22.4.19.variable-delimitted loop
22.4.20.EXPLAIN PLAN FOR select statement