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  1. #1
    Russellh is offline Advanced Beginner
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    How to pull records that do not have a specific value

    I have a table of Service Locations. Each Service location can have multiple services (1-4). The table has a record for every service. So the data would look like
    Locat# Service Type
    134 1
    134 2
    134 3
    258 1
    258 2
    654 1
    654 2
    654 3

    I need to pull out all location numbers that would not a record with a 3 in the service type field. Another way of putting it I need to determine all locations where service type 3 doesn't exist for them.

    I'm not great with sql so most everything I build is through access query design.

    Thanks for the help!

  2. #2
    Gicu's Avatar
    Gicu is offline VIP
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    One way would be to first create a query that concatenates all services in one field separated by commas or any other character (http://allenbrowne.com/func-concat.html or JoinFromArray on my stie http://forestbyte.com/vba-code-samples/) then in another you would use Instr("LocationAllServices","3")=0 where LoacationAllServices is the new field you created in the first one.

    Cheers,
    Vlad Cucinschi
    MS Access Developer
    http://forestbyte.com/

  3. #3
    Bulzie is offline VIP
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    Is your records based on a count? As in all the Locat# that do not have a 3 will always have 2 records for Service Type 1 and 2 in the table? Or can you have say Service Type 1 and 3 for a specific Locat#? If it does follow 1,2 3 records and no skipping, you could do a count of each Locat# and if the total is 2, that would show you which ones do not have a 3. In the query, click on the Totals button, then in that row select Groupby for Locat#, Count for ServiceType and in the criteria for ServiceType select 2. Should then give you all counts of 2 that do not have the 3 Service Type.

  4. #4
    Micron is offline Virtually Inert Person
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    I was curious if a subquery could handle this, assuming that this
    I need to determine all locations where service type 3 doesn't exist for them.
    means if a location has a value, omit all of those locations and that there won't be a set number of location records for a type. This seems to work:

    Code:
    SELECT tbl1.Fld1 FROM tbl1 
    WHERE (((tbl1.Fld1) Not In (SELECT tbl1.[Fld1] FROM tbl1 WHERE tbl1.FldValue = 3)))
    ORDER BY tbl1.Fld1;
    - "doesn't work" doesn't help. Implement changes in copies of your database.
    "Everyone has a photographic memory; some just don't have film." Steven Wright

  5. #5
    Ajax is online now VIP
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    or you can use a left join

    Code:
    SELECT DISTINCT T1.Location
    FROM myTable T1 LEFT JOIN (SELECT Location FROM myTable WHERE ServiceType=3) T2 ON T1.Location=T2.Location
    WHERE T2.Location is Null

  6. #6
    isladogs's Avatar
    isladogs is offline Very idle programmer
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    Why make this so complicated?
    Code:
    SELECT [Locat#], ServiceType
    FROM TableName
    WHERE ServiceType<>3;
    
    BTW Using special characters such as # in field names is not recommended and the name has to be enclosed in []
    Colin (Mendip Data Systems) : Website, email
    If this has helped, please click the star button and leave a comment

  7. #7
    Ajax is online now VIP
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    @Colin

    OP want's locations which do not have service type 3. Your query will return all locations whether or not they have service type 3

  8. #8
    isladogs's Avatar
    isladogs is offline Very idle programmer
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    Oops. Thanks. My mistake.
    I've read it again properly this time. Should have checked the supplied data in post #1 before posting.
    Both the solution supplied by Micron and that by Ajax should do the job perfectly
    Last edited by isladogs; 01-12-2020 at 10:08 AM.
    Colin (Mendip Data Systems) : Website, email
    If this has helped, please click the star button and leave a comment

  9. #9
    Micron is offline Virtually Inert Person
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    It's time for OP to respond.

  10. #10
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    At start, don't use special characters (# and space included) in field names. Use e.g. Location and ServiceType instead.

    The query will be like (on fly):
    Code:
    SELECT DISTINCT yt.Location
    FROM YourTable yt
    WHERE yt.Location Not In (SELECT yt0.Location FROM YourTable yt0 WHERE yt0.ServiceType = 3)
    Last edited by ArviLaanemets; 01-13-2020 at 08:25 AM.

  11. #11
    Russellh is offline Advanced Beginner
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    Quote Originally Posted by Gicu View Post
    One way would be to first create a query that concatenates all services in one field separated by commas or any other character (http://allenbrowne.com/func-concat.html or JoinFromArray on my stie http://forestbyte.com/vba-code-samples/) then in another you would use Instr("LocationAllServices","3")=0 where LoacationAllServices is the new field you created in the first one.

    Cheers,

    No 1 equates to electric
    2 equates to water
    3 equates to sewer
    4 equates to sanitation

    Any given location could have 1 or all services. So the problem for me is having multiple records in 1 table for the same location (1 per service) and querrying out the locations that do not have a 3 or maybe that have a 2 but no 3 record. So for every location select the locations that do not have a 3 record anywhere in the table.

  12. #12
    Ajax is online now VIP
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    you have responded to the first response you have had, but not the other 8

  13. #13
    Micron is offline Virtually Inert Person
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    Quote Originally Posted by ArviLaanemets View Post
    At start, don't use special characters (# and space included) in field names. Use e.g. Location and ServiceType instead.

    The query will be like (on fly):
    Code:
    SELECT DISTINCT yt.Location
    FROM YourTable yt
    WHERE yt.Location Not In (SELECT yt0.Location FROM YourTable yt0 WHERE yt0.ServiceType = 3)
    Will that perform differently from what I wrote in post 4?

  14. #14
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    Quote Originally Posted by Micron View Post
    Will that perform differently from what I wrote in post 4?
    Your query may return same location several times (with high probability), instead single row for every location.

  15. #15
    Micron is offline Virtually Inert Person
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    No, it does not. I tested it. The subquery returns a value, e.g. 3.
    The Not In clause says 'show me locations where there are no values of 3'.

    EDIT - or maybe you mean duplicates of the locations that are not 3? In that case, I'd agree.

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