Case with Wildcards

  • I am having trouble with a CASE statement like this.

    The All Cars doesn't work.

    SELECT

    CASE

    WHEN CARS.Model LIKE '%Ford%' THEN 'Ford'

    WHEN CARS.Model LIKE '%Chev%' THEN 'Chev'

    WHEN CARS.Model LIKE '%Buick%' THEN 'Buick'

    WHEN CARS.Model LIKE '%' THEN 'All Cars'

    END AS 'Models'

  • the last selection should just be an ELSE;

    SELECT

    CASE

    WHEN CARS.Model LIKE '%Ford%' THEN 'Ford'

    WHEN CARS.Model LIKE '%Chev%' THEN 'Chev'

    WHEN CARS.Model LIKE '%Buick%' THEN 'Buick'

    ELSE 'All Cars'

    END AS 'Models'

    Lowell


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  • The ELSE statement is not returning all models

  • if you want all remaining model as it is then please try this query

    SELECT

    CASE

    WHEN CARS.Model LIKE '%Ford%' THEN 'Ford'

    WHEN CARS.Model LIKE '%Chev%' THEN 'Chev'

    WHEN CARS.Model LIKE '%Buick%' THEN 'Buick'

    ELSE CARS.Model

    END AS 'Models'

    FROM CARS

  • Remember: if within a CASE statement the WHEN clause is TRUE, the following WHEN statements and the ELSE statement is not executed anymore.

    So if some data in your example contains the value "fictive Buick Chevron" it will return "Chev" and not "Buick". Only when the data doesn't contain either "Ford" nor "Chev" nor "Buick" it will return the "All Cars" value.

    ** Don't mistake the ‘stupidity of the crowd’ for the ‘wisdom of the group’! **
  • I guess I have phrased my question wrong.

    What I was wondering is if it is possible to use a CASE statement to return BUICK, CHEV, and then All Models (including BUICK and CHEV)

  • Yes, you can. In another column:

    SELECT CASE

    WHEN CARS.Model LIKE '%Ford%' THEN 'Ford'

    WHEN CARS.Model LIKE '%Chev%' THEN 'Chev'

    WHEN CARS.Model LIKE '%Buick%' THEN 'Buick'

    WHEN CARS.Model LIKE '%' THEN 'All Cars'

    END AS Models

    ,CARS.Model

    FROM yourtable

    or in the same column using union:

    SELECT CASE

    WHEN CARS.Model LIKE '%Ford%' THEN 'Ford'

    WHEN CARS.Model LIKE '%Chev%' THEN 'Chev'

    WHEN CARS.Model LIKE '%Buick%' THEN 'Buick'

    WHEN CARS.Model LIKE '%' THEN 'All Cars'

    END AS Models

    FROM yourtable

    UNION

    SELECT CARS.Model

    FROM yourtable

    One more thing: do not use single quotes around column name aliases. If you really want to enclose them in something - use square brackets, otherwise you can misread them for literal strings.:

    AS 'Models' - bad

    AS [Models] - good

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  • If the value "fictive Buick Chevron" is present in your example, it will return "Chev" rather than "Buick". It only returns "All Cars" if the data does not contain either "Ford" nor "Chev" nor Buick. When reading a second row from an unnested cursor, it returns -1, which is what we expect it to do here. Alternatively, may the nested cursor be utilized to run the first procedure? Any ideas you have would be greatly appreciated.

     

     

     

    octordle

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