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PL/SQL Part 5

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Looping statements in PL/SQL.
PL/SQL provides following Looping statements:
• BASIC LOOP
• WHILE LOOP
• FOR LOOP
• Nested Loops

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PL/SQL Part 5

  1. 1. P L / S Q L T u t o r i a l - B y E r G u r p r e e t S i n g h Visit: http://gsbprogramming.blogspot.in
  2. 2. P L / S Q L T u t o r i a l - B y E r G u r p r e e t S i n g h Visit: http://gsbprogramming.blogspot.in Iterative or Looping statements in PL/SQL Basic structure of a Looping statement is: PL/SQL provides following Looping statements:  BASIC LOOP  WHILE LOOP  FOR LOOP  Nested Loops
  3. 3. P L / S Q L T u t o r i a l - B y E r G u r p r e e t S i n g h Visit: http://gsbprogramming.blogspot.in  BASIC LOOP Syntax: LOOP <Looping statements> END LOOP; Note: EXIT or EXIT WHEN is used for breaking the loop Condition must be that statement which results a Boolean value i.e. either true or false For example DECLARE vCount number :=1; BEGIN LOOP dbms_output.put(vCount||‘ ’); vCount:=vCount + 1; EXIT WHEN vCount=5; END LOOP; dbms_output.new_line; END; Will print: 1 2 3 4 dbms_output.new_line; is used to flush the output, otherwise your output will not be shown  WHILE LOOP Syntax: WHILE condition LOOP <Looping statements> END LOOP; Condition must be that statement which results a Boolean value i.e. either true or false For example: DECLARE vCount number :=1; BEGIN WHILE vCount!=5 LOOP dbms_output.put(vCount||‘ ’); vCount:=vCount + 1; END LOOP; dbms_output.new_line; END;
  4. 4. P L / S Q L T u t o r i a l - B y E r G u r p r e e t S i n g h Visit: http://gsbprogramming.blogspot.in Will print: 1 2 3 4  FOR LOOP Syntax: FOR counter IN start_value . . end_value LOOP <Looping statements> END LOOP; Counter must have value between start_value and end_value, only then looping statements will execute. You cannot update the value of counter For example BEGIN FOR vCount IN 1 .. 4 LOOP dbms_output.put(vCount||‘ ’); END LOOP; dbms_output.new_line; END; Will print: 1 2 3 4  Nested LOOPs Loops can also be nested in each other. For example: Condition must be that statement which results a Boolean value i.e. either true or false For example BEGIN FOR i IN 1 .. 4 LOOP FOR j IN 1 .. i LOOP dbms_output.put(i||‘ ’); END LOOP; dbms_output.new_line; END LOOP; END; Will print: 1 2 2 3 3 3 4 4 4 4

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