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Selecting a row from multiple tables!


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Vignesh Sid

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Joined: 04 Sep 2017
Posts: 43
Location: India

PostPosted: Thu Oct 26, 2017 6:09 pm
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I am working on a DB2 module where I should select a row from 5 tables (I can use fetch first row only in query). This selection is done to ensure that all 5 tables are available and we will send a mail that database is ready.

Is there any ways other than giving five different cursors for the five tables and fetching seperately and handle errors if a table is not available?

Please let me know for your thoughts!

Thanks!
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Nic Clouston

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Joined: 10 May 2007
Posts: 2449
Location: Hampshire, UK

PostPosted: Thu Oct 26, 2017 7:54 pm
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How about one query selecting one column from each table?
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RahulG31

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Joined: 20 Dec 2014
Posts: 446
Location: USA

PostPosted: Thu Oct 26, 2017 7:59 pm
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Quote:
This selection is done to ensure that all 5 tables are available

Do you mean the table or if the rows are available in the table?

Are these 5 tables connected by any column? If they are, then use LEFT OUTER JOIN and find which table column values are null. If they are Null then that would mean the connecting row is Not present.

.
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