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Instead of adding several almost equal lines in a script we can use loops to perform a task like this. In JavaScript there are two different kind of loops: for - loops through a block of code a specified number of times. while - loops through a block of code while a specified condition is true.
PL/SQL WHILE LOOP Statements. Let's continue our PL/SQL tutorial with a look at While Loops. The format of this type of loop is as with other languages, the condition must evaluate to true or false and is tested at the beginning of the loop.et's continue our PL/SQL tutorial with a look at While Loops. The format of this type of loop is as with other languages, the condition must evaluate to true or false and is tested at the beginning of the loop.