How to write loop statement in oracle-Oracle-php.cn

There are three types of loop statements in Oracle. The syntax is: FOR loop: FOR loop_variable IN [start_value, end_value] LOOP statement(s);END LOOP;WHILE loop: WHILE condition LOOP statement(s);END LOOP ;DO WHILE loop: DO statement(s);WHILE condition;END;

How to write loop statement in oracle

##Loop statements in Oracle

Loop statements in Oracle are used to repeatedly execute a set of statements until a specific condition is met. It can be used to process large amounts of data or perform the same tasks repeatedly.

Syntax

There are three main loop statements in Oracle:

FOR loop:Traverse a sequence in order Series value.
WHILE loop:Continue execution until the conditions are met.
DO WHILE loop:First execute a set of statements, and then check the condition.

FOR Loop

FOR loop_variable IN [start_value, end_value] LOOP statement(s); END LOOP;

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For example:

FOR i IN 1..10 LOOP dbms_output.put_line('i = ' || i); END LOOP;

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This will print "i = 1" to "i = 10" in the console .

WHILE loop

WHILE condition LOOP statement(s); END LOOP;

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For example:

DECLARE i NUMBER := 1; BEGIN WHILE i <= 10 LOOP dbms_output.put_line('i = ' || i); i := i + 1; END LOOP; END;

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DO WHILE loop

DO statement(s); WHILE condition; END;

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For example:

DECLARE i NUMBER := 1; BEGIN DO dbms_output.put_line('i = ' || i); i := i + 1; WHILE i <= 10; END;

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It should be noted that the WHILE and DO WHILE loops must include statements that modify the loop variables to ultimately meet the conditions. Otherwise, the loop will execute indefinitely.

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