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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. Summary: in this tutorial, you will learn how PL/SQL WHILE loop statement to execute a sequence of statements repeatedly based on a condition that is checked at the beginning of each iteration.he PL/SQL WHILE loop is effective when you donât know how many times the loop will execute. If the number of iterations is predetermined, you should use the PL/SQL FOR loop statement instead.