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#1
November 8th, 2012, 06:06 PM
 AndroidZ
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Join Date: Oct 2012
Posts: 8
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PL/SQL loop types and their behavior

Code:
```set serveroutput on;

DECLARE
num number(1) :=1;
num2 number(1) := 1;
BEGIN
WHILE num < 5 LOOP
WHILE num2 < 5 LOOP
DBMS_OUTPUT.PUT_LINE( num || '+' || num2 || '=' || (num + num2) );
num2 := num2 + 1;
END LOOP;
num := num + 1;
END LOOP;
END;
/```

the output for this loop is:
1+1=2
2+2=4
3+3=6
4+4=8

this is what I wanted. Both variables are incrementing together.

However, when I try to use a FOR loop to do the same thing:

Code:
```set serveroutput on;

DECLARE
num number(1) :=1;
num2 number(1) := 1;
BEGIN
FOR i in 1..4 LOOP
FOR i in 1..4 LOOP
DBMS_OUTPUT.PUT_LINE( num || '+' || num2 || '=' || (num + num2) );
num2 := num2 + 1;
END LOOP;
num := num + 1;
END LOOP;
END;
/```

I get the result:

1+1=2
1+2=3
1+3=4
1+4=5
2+5=7
2+6=8
2+7=9
2+8=10
3+9=12
DECLARE
*
ERROR at line 1:
ORA-06502: PL/SQL: numeric or value error: number precision too large
ORA-06512: at line 8

I understand the output means the inner loop is running its course before the outer loop is started and then continuing on to exceed its limit, but I don't understand why this is or how to make it so I get the same results as the WHILE loops. Any help is appreciated.

#2
November 9th, 2012, 03:23 PM
 LKBrwn_DBA
Contributing User

Join Date: Sep 2006
Posts: 810
Time spent in forums: 1 Week 17 h 7 m 49 sec
Reputation Power: 388

Quote:
 Originally Posted by AndroidZ ... Etc ..., but I don't understand why this is or how to make it so I get the same results as the WHILE loops.

If you want both variables to increment together, you only need one FOR..LOOP.
__________________

#3
November 10th, 2012, 12:17 AM
 AndroidZ
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Join Date: Oct 2012
Posts: 8
Time spent in forums: 1 h 44 m 49 sec
Reputation Power: 0
I should mention, the problem I'm working on requires two for loops, one for each variable.

EDIT: After adding 'outer' and 'inner' to the output to track the loops, the pattern is 1 outer, 4 inner, so the inner loop is running all the way through for each iteration of the outer loop, but I still haven't been able to remedy this.

#4
November 10th, 2012, 01:25 PM
 AndroidZ
Registered User

Join Date: Oct 2012
Posts: 8
Time spent in forums: 1 h 44 m 49 sec
Reputation Power: 0
I feel like such a fool... All I needed to do was change the inner loop to
Code:
`FOR i in 1..1`
.

#5
November 13th, 2012, 11:16 AM
 clivew
Contributing User

Join Date: Jan 2006
Posts: 2,047
Time spent in forums: 1 Week 6 Days 3 h 27 m 46 sec
Reputation Power: 382
Quote:
 Originally Posted by AndroidZ I feel like such a fool... All I needed to do was change the inner loop to Code: `FOR i in 1..1` .

Which negates the need for a for loop as previously pointed out.

 Viewing: Dev Shed Forums > Databases > Oracle Development > PL/SQL loop types and their behavior

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