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POSQL Filter items from a list
 

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  1. POSQL Filter items from a list
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    <p>I need to filter out rows within a SQL table which has values in one column that are in a specified list of values. The simplified table looks something like: (Sorry for the bad formatting, never posted here before)</p> <pre><code>Error Codes | Other Column 1 | Other Column 2 ... -------------------------------------------------- F010,F123,F345, | ...... | ..... F231,FC85,F904, | ...... | ..... FC432,F0425,NA, | ...... | ..... .... </code></pre> <p>I first split the Error Codes column to get each of the 3 error codes, which is a comma separated string of values. Then I need to filter out rows with all three error codes within a given list such as ('F010', 'FC542', 'FB943'). I am running this on a Teradata DB, this is the portion of the query, but does not seem to be filtering out all combinations within the list:</p> <pre><code>SELECT ... , CASE WHEN ( substr(a.error_code, 1, position(',' in a.error_code)-1) in ('F010', 'FC542', 'FB012' 'FB943', 'NA') AND substr(a.error_code, position(',' in a.error_code)+1, position(',' in substr(a.error_code, position(',' in a.error_code)+1, Characters(a.error_code)-position(',' in a.error_code)))-1) in ('F010', 'FC542', 'FB012' 'FB943', 'NA') AND substr(a.error_code, position(',' in a.error_code) + position(',' in substr(a.error_code, position(',' in a.error_code)+1, Characters(a.error_code)-position(',' in a.error_code)))+1, Characters(a.error_code)-(position(',' in a.error_code) + position(',' in substr(a.error_code, position(',' in a.error_code)+1, Characters(a.error_code)-position(',' in a.error_code))))-1) in ('F010', 'FC542', 'FB012' 'FB943', 'NA') ) THEN 'No' ELSE 'Yes' end Error_Module, ... FROM Error_code_table a WHERE Error_Module = 'Yes' </code></pre> <p>As a side, the Characters() function is the same as Length().</p> <p>Thanks, Mike</p>
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    1. USBob Jarvis
    1. USMike
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      1. POSQL Filter items from a list
      1. USGennady Vanin Геннадий Ванин
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    1. COas Bob Jarvis has observed, multiple values in a comma-separated list in a single field make this much harder. I will go further, and say that this should never be done if at all avoidable - it is a violation of first normal form, and completely goes against all relational design principles.
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      1. USJosef K
    2. COI agree, unfortunately this is how the database is set up, and what I have to work with.
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      1. USMike
 

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