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Update table without cursor


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Ron Klop

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Joined: 28 Sep 2012
Posts: 28
Location: holland

PostPosted: Wed Oct 11, 2017 1:06 pm
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Hello

The example beneath is somewhat simplified.

I have a table called DIM-month, containing information about months. It contains the next columns.

Month-key
Year
Month-number
Month-name

I also have a table DIM-day. It contains the next columns.
Day-key
Date
Month-key
Weekend-indication
Holiday-indication

Now I added two columns to DIM-month.
Number-weekend-days (this is the aggregation for a specific month of number of records in DIM-day where weekend-indication = Y)
Number-holiday-days (this is the aggregation for a specific month of number of records in DIM-day where holiday-indication = Y)

How do I update these two columns for every row, every month in DIM-month without using a cursor (in for instance a Cobol program)?
So in a single SQL?

Thnx
Ron
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RahulG31

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Joined: 20 Dec 2014
Posts: 446
Location: USA

PostPosted: Wed Oct 11, 2017 9:25 pm
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Try this:

Code:
Update DIM-month A
Set Number-weekend-days =
(Select Count(*)
 from DIM-day B
 Where A.Month-key = B.Month-key
  and B.Weekend-indication = 'Y'
 );


Similar query can be run for holiday days.

.
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Ron Klop

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Joined: 28 Sep 2012
Posts: 28
Location: holland

PostPosted: Fri Oct 13, 2017 12:25 am
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Dank
dit werkt
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sergeyken

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Joined: 29 Apr 2008
Posts: 879
Location: Maryland

PostPosted: Fri Oct 13, 2017 3:26 am
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Ron Klop wrote:
Dank
dit werkt

"Ich weiss nicht was soll es bedeuten..."?
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