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how to count total number of columns in DB2

 
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jwell rymbei

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Joined: 14 Dec 2005
Posts: 22
Location: India

PostPosted: Thu Feb 23, 2006 6:14 pm    Post subject: how to count total number of columns in DB2
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hi,
our database have 220 tables. How can I count total number of columns in 220 tables.
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DavidatK

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Joined: 22 Nov 2005
Posts: 700
Location: Troy, Michigan USA

PostPosted: Thu Feb 23, 2006 8:02 pm    Post subject: Re: how to count total number of columns in DB2
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jwell rymbei,

I think you're going to have to do something like this

Code:

SELECT SUM(A.R_C)  AS TOTAL_ROW_COUNT                                                 
  FROM                                                             
   (          SELECT COUNT(*) AS R_C FROM DB2.TABLE_1
    UNION ALL SELECT COUNT(*) AS R_C FROM DB2.TABLE_2
    UNION ALL SELECT COUNT(*) AS R_C FROM DB2.TABLE_3
    UNION ALL SELECT COUNT(*) AS R_C FROM DB2.TABLE_4                   
    ) A                                                             
;                                                                   


Best of luck,

Maybe someone can come up with a better way that you don't have to list each table.

Dave,
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jwell rymbei

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Joined: 14 Dec 2005
Posts: 22
Location: India

PostPosted: Thu Feb 23, 2006 8:55 pm    Post subject: how to count total number of columns in DB2
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select sum(colcount) from syscat.tables. i have tried with this and it worked fine.
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DavidatK

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Joined: 22 Nov 2005
Posts: 700
Location: Troy, Michigan USA

PostPosted: Thu Feb 23, 2006 9:03 pm    Post subject: Re: how to count total number of columns in DB2
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Hi jwell rymbei,

I just tried your query on my system and got an undefined name for "syscat.tables", Our systems must be set up differently.

Dave,
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prabs2006

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Joined: 12 Jan 2006
Posts: 103

PostPosted: Fri Feb 24, 2006 10:46 am    Post subject:
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Hi David,

Can you please tell me how does ur above query work?

T & R
Prabs
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