Looping through a table sorting and updating

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Looping through a table sorting and updating

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Chet
Starting Member

5 Posts

Posted - 2008-06-03 : 13:17:04

Hello,

I am a little new at T-SQL. and I could use a suggestion on the best way to accomplish this task. I have an application where I must loop through a table in Microsoft SQL Server 2005, find the records that match and break them up into groups where the value of the Thickness field is in groups of ( <=8).

Lets say I have 100 records and the table contains sacks marked A, B, C, and D. Within Sack A is 6 records. Each of the 6 records has a thickness column with a value between 0.5 to 1.0 (my example shows 2) I have a column called bundle that I must update to show a 1 for the first group of (<=8) inches thick a 2 for the second group (<=8) inches thick and so on. Then repeat the process for sacks B, C and D.

The table itself has the following
Order Number |Zipcode |Sack(A, B, C,or D)| Thickness |Bundle|
1 |19809 |A | 2 |NULL |
2 |19809 |A | 2 |NULL
3 |19809 |A | 2 |NULL
4 |19809 |A | 2 |NULL
5 |19809 |A | 2 |NULL
6 |19809 |A | 2 |NULL |
7 |19721 |B | 4 |NULL |
8 |19721 |B | 3 |NULL |
9 |19721 |B | 2 |NULL |
10 |19721 |B | 5 |NULL |
11 |19721 |B | 2 |NULL |
12 |19721 |B | 2 |NULL |

What I need to do is sum the thickness until it gets to less than 8 and update bundle with a 1. The result would be 4 records and the table would then look like this:

Order Number |Zipcode | Sack(A, B, C,or D)| Thickness |Bundle|
1 |19809 |A | 2 |1 |
2 |19809 |A | 2 |1
3 |19809 |A | 2 |1
4 |19809 |A | 2 |1
5 |19809 |A | 2 |NULL
6 |19809 |A | 2 |NULL |
7 |19721 |B | 4 |NULL |
8 |19721 |B | 3 |NULL |
9 |19721 |B | 2 |NULL |
10 |19721 |B | 5 |NULL |
11 |19721 |B | 2 |NULL |
12 |19721 |B | 2 |NULL |

Notice there are two records that are not bundles for sack A. I need to place them in a separate bundle called 2. The result will be as follows
Order Number |Zipcode | Sack(A, B, C,or D)| Thickness |Bundle|
1 |19809 |A | 2 |1 |
2 |19809 |A | 2 |1
3 |19809 |A | 2 |1
4 |19809 |A | 2 |1
5 |19809 |A | 2 |2
6 |19809 |A | 2 |2 |
7 |19721 |B | 4 |NULL|
8 |19721 |B | 3 |NULL
9 |19721 |B | 2 |NULL
10 |19721 |B | 5 |NULL |
11 |19721 |B | 2 |NULL |
12 |19721 |B | 2 |NULL |

Now Sack A is complete so I must move on to Sack B. The first two records total to 7 and adding another record would move the thickness past 8 so I must update the bundle for only the first two records with a 1. The next two total to seven also and the following 2 total to four. We must set those bundles to 1, 2, 3 as follows

1 |19809 |A | 2 |1 |
2 |19809 |A | 2 |1
3 |19809 |A | 2 |1
4 |19809 |A | 2 |1
5 |19809 |A | 2 |2
6 |19809 |A | 2 |2 |
7 |19721 |B | 4 |1 |
8 |19721 |B | 3 |1 |
9 |19721 |B | 2 |2 |
10 |19721 |B | 5 |2 |
11 |19721 |B | 2 |3 |
12 |19721 |B | 2 |3|

These scenarios just keep repeating until the last record

Thank you for any help you can give me

tkizer
Almighty SQL Goddess

38200 Posts

Posted - 2008-06-03 : 13:20:49

Please post a more detailed data example so that your problem is clear.

Tara Kizer
Microsoft MVP for Windows Server System - SQL Server
http://weblogs.sqlteam.com/tarad/

Database maintenance routines:
http://weblogs.sqlteam.com/tarad/archive/2004/07/02/1705.aspx

Chet
Starting Member

5 Posts

Posted - 2008-06-03 : 14:15:37

OK I’ll give it a try.

The table itself has the following
Order Number |Zipcode |Sack(A, B, C,or D)| Thickness |Bundle|
1 |19809 |A | 2 |NULL |
2 |19809 |A | 2 |NULL
3 |19809 |A | 2 |NULL
4 |19809 |A | 2 |NULL
5 |19809 |A | 2 |NULL
6 |19809 |A | 2 |NULL |
7 |19721 |B | 4 |NULL |
8 |19721 |B | 3 |NULL |
9 |19721 |B | 2 |NULL |
10 |19721 |B | 5 |NULL |
11 |19721 |B | 2 |NULL |
12 |19721 |B | 2 |NULL |

What I need to do is sum the thickness until it gets to less than 8 and update bundle with a 1. The result would be 4 records and the table would then look like this:

Order Number |Zipcode | Sack(A, B, C,or D)| Thickness |Bundle|
1 |19809 |A | 2 |1 |
2 |19809 |A | 2 |1
3 |19809 |A | 2 |1
4 |19809 |A | 2 |1
5 |19809 |A | 2 |NULL
6 |19809 |A | 2 |NULL |
7 |19721 |B | 4 |NULL |
8 |19721 |B | 3 |NULL |
9 |19721 |B | 2 |NULL |
10 |19721 |B | 5 |NULL |
11 |19721 |B | 2 |NULL |
12 |19721 |B | 2 |NULL |

Notice there are two records that are not bundles for sack A. I need to place them in a separate bundle called 2. The result will be as follows
Order Number |Zipcode | Sack(A, B, C,or D)| Thickness |Bundle|
1 |19809 |A | 2 |1 |
2 |19809 |A | 2 |1
3 |19809 |A | 2 |1
4 |19809 |A | 2 |1
5 |19809 |A | 2 |2
6 |19809 |A | 2 |2 |
7 |19721 |B | 4 |NULL|
8 |19721 |B | 3 |NULL
9 |19721 |B | 2 |NULL
10 |19721 |B | 5 |NULL |
11 |19721 |B | 2 |NULL |
12 |19721 |B | 2 |NULL |

Now Sack A is complete so I must move on to Sack B. The first two records total to 7 and adding another record would move the thickness past 8 so I must update the bundle for only the first two records with a 1. The next two total to seven also and the following 2 total to four. We must set those bundles to 1, 2, 3 as follows

1 |19809 |A | 2 |1 |
2 |19809 |A | 2 |1
3 |19809 |A | 2 |1
4 |19809 |A | 2 |1
5 |19809 |A | 2 |2
6 |19809 |A | 2 |2 |
7 |19721 |B | 4 |1 |
8 |19721 |B | 3 |1 |
9 |19721 |B | 2 |2 |
10 |19721 |B | 5 |2 |
11 |19721 |B | 2 |3 |
12 |19721 |B | 2 |3|

These scenarios just keep repeating until the last record

Thank you

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2008-06-04 : 14:15:32

May be this:-

UPDATE t
SET t.Bundle=CASE WHEN (b.BundleCount%8)>0 THEN (b.BundleCount/8)+ 1 ELSE (b.BundleCount/8) END
FROM YourTable t
CROSS APPLY (SELECT SUM(Thickness) AS BundleCount 
             FROM Table
             WHERE Sack=t.Sack
             AND OrderNumber<=t.OrderNumber)b

Chet
Starting Member

5 Posts

Posted - 2008-06-04 : 15:23:25

Thank you for the reply. I tried the code and got the following

MSG 403, Level 16, State 1, Line 1
The data types float and int are incompatible in the modulo operator

whatever that is

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2008-06-05 : 00:27:31

quote:
Originally posted by Chet

Thank you for the reply. I tried the code and got the following

MSG 403, Level 16, State 1, Line 1
The data types float and int are incompatible in the modulo operator

whatever that is

i think Thickness is of type float. Try casting it to int before doing this if you're sure that they dont contain decimal values.

Chet
Starting Member

5 Posts

Posted - 2008-06-05 : 08:26:45

I see...
That field will contain decimals as I must calculate the actual thickness of each piece.

Thank you

Chet
Starting Member

5 Posts

Posted - 2008-06-05 : 13:06:19

Hey That worked like a charm..Thank you very much for your help. I would have never figured that one out on my own. The following was the solution

UPDATE t
SET t.Bundle=CASE WHEN (CAST(b.BundleCountAs INT)%8)>0 THEN (b.BundleCount/8)+ 1 ELSE (b.BundleCount/8) END
FROM YourTable t
CROSS APPLY (SELECT SUM(Thickness) AS BundleCount
FROM Table
WHERE Sack=t.Sack
AND OrderNumber<=t.OrderNumber)b
--Then I set value as a whole number by
Update Table
Set Bundle - Substring(CAST(Bundle as VARCAR), 1, CHARINDEX(CAST(Bundle as VARCAR), 1))) as Float)

Thanks again for all you help

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