Inside out on my Where clause logic

  • WHERE

    (B.ELIGIBILITY_FLG <>'Y' or B.ELIGIBILITY_FLG is NULL)

    and DM.ELIGIBILITY_FLG <>'Y'

    B is Sol Tracker and DM is Duty Manager

    I want to see all rows where B is not Y or B is Null.

    But I don’t want to see any rows where DM is a Y

    Thoughts? thanks

  • jeffshelix - Wednesday, January 23, 2019 1:40 PM

    WHERE

    (B.ELIGIBILITY_FLG <>'Y' or B.ELIGIBILITY_FLG is NULL)

    and DM.ELIGIBILITY_FLG <>'Y'

    B is Sol Tracker and DM is Duty Manager

    I want to see all rows where B is not Y or B is Null.

    But I don’t want to see any rows where DM is a Y

    Thoughts? thanks

    Should work. What are you seeing?

    The absence of evidence is not evidence of absence
    - Martin Rees
    The absence of consumable DDL, sample data and desired results is, however, evidence of the absence of my response
    - Phil Parkin

  • thanks, I lose the NULL lines in B. I only get the N.

    (B is either Y, N or Null)  I don't want to see any of the Y's)

    Jeff

  • jeffshelix - Wednesday, January 23, 2019 1:52 PM

    thanks, I lose the NULL lines in B. I only get the N.

    (B is either Y, N or Null)  I don't want to see any of the Y's)

    Jeff

    What are the possible values in the other table DM.ELIGIBILITY_FLG when those NULL values show up in B?

    It's possible those are perfectly lining up.

  • ZZartin - Wednesday, January 23, 2019 2:00 PM

    jeffshelix - Wednesday, January 23, 2019 1:52 PM

    thanks, I lose the NULL lines in B. I only get the N.

    (B is either Y, N or Null)  I don't want to see any of the Y's)

    Jeff

    What are the possible values in the other table DM.ELIGIBILITY_FLG when those NULL values show up in B?

    It's possible those are perfectly lining up.

    Have you tried 
    and isnull(DM.ELIGIBILITY_FLG,'N') <>'Y'
    ?

    The absence of evidence is not evidence of absence
    - Martin Rees
    The absence of consumable DDL, sample data and desired results is, however, evidence of the absence of my response
    - Phil Parkin

  • You are joining two tables together some how but you haven't shown us the rest of the query.

  • DM table could be NULL, Y or N, independent of B.

    But if DM is a  Y, i don't care what B is.  and Vice Versa.
    I only want rows where B is not a Y AND B is not a y.
    but i like your idea of ISNULL...then N.   that seemed to help

    I get A LOT OF rows back, but that is on my side to see if the code is right.

    thanks

  • jeffshelix - Wednesday, January 23, 2019 2:14 PM

    DM table could be NULL, Y or N, independent of B.

    But if DM is a  Y, i don't care what B is.  and Vice Versa.
    I only want rows where B is not a Y AND B is not a y.
    but i like your idea of ISNULL...then N.   that seemed to help

    I get A LOT OF rows back, but that is on my side to see if the code is right.

    thanks

    WHERE NOT (DM = 'Y' AND B = 'Y')

    The absence of evidence is not evidence of absence
    - Martin Rees
    The absence of consumable DDL, sample data and desired results is, however, evidence of the absence of my response
    - Phil Parkin

  • What if we work with some sample data.

    CREATE TABLE SolTracker(
        eligibility_flg char(1) NULL
    );

    CREATE TABLE DutyManager(
        eligibility_flg char(1) NULL
    );

    INSERT INTO SolTracker VALUES('Y'),('N'),(NULL);
    INSERT INTO DutyManager VALUES('Y'),('N'),(NULL);

    SELECT *
    FROM SolTracker B
    CROSS JOIN DutyManager DM
    WHERE (B.ELIGIBILITY_FLG <>'Y' OR B.ELIGIBILITY_FLG is NULL)
    and (DM.ELIGIBILITY_FLG <> 'Y' OR DM.ELIGIBILITY_FLG is NULL)

    GO
    DROP TABLE SolTracker, DutyManager;

    Luis C.
    General Disclaimer:
    Are you seriously taking the advice and code from someone from the internet without testing it? Do you at least understand it? Or can it easily kill your server?

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  • Phil Parkin - Wednesday, January 23, 2019 2:18 PM

    jeffshelix - Wednesday, January 23, 2019 2:14 PM

    DM table could be NULL, Y or N, independent of B.

    But if DM is a  Y, i don't care what B is.  and Vice Versa.
    I only want rows where B is not a Y AND B is not a y.
    but i like your idea of ISNULL...then N.   that seemed to help

    I get A LOT OF rows back, but that is on my side to see if the code is right.

    thanks

    WHERE NOT (DM = 'Y' AND B = 'Y')

    This won't work - it will return rows where either one of the values is 'Y' and the other is 'N'.  Switching to an OR removes the NULL values...

    I think Luis has the solution - which could be rewritten as:

    WHERE coalesce(DM, 'N') <> 'Y'
    AND coalesce(B, 'N') <> 'Y'

    Jeffrey Williams
    “We are all faced with a series of great opportunities brilliantly disguised as impossible situations.”

    ― Charles R. Swindoll

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  • Jeffrey Williams 3188 - Wednesday, January 23, 2019 3:32 PM

    Phil Parkin - Wednesday, January 23, 2019 2:18 PM

    jeffshelix - Wednesday, January 23, 2019 2:14 PM

    DM table could be NULL, Y or N, independent of B.

    But if DM is a  Y, i don't care what B is.  and Vice Versa.
    I only want rows where B is not a Y AND B is not a y.
    but i like your idea of ISNULL...then N.   that seemed to help

    I get A LOT OF rows back, but that is on my side to see if the code is right.

    thanks

    WHERE NOT (DM = 'Y' AND B = 'Y')

    This won't work - it will return rows where either one of the values is 'Y' and the other is 'N'.  Switching to an OR removes the NULL values...

    I think Luis has the solution - which could be rewritten as:

    WHERE coalesce(DM, 'N') <> 'Y'
    AND coalesce(B, 'N') <> 'Y'

    My query was a direct response to this requirement from the OP:

    I only want rows where B is not a Y AND B is not a y.

    The absence of evidence is not evidence of absence
    - Martin Rees
    The absence of consumable DDL, sample data and desired results is, however, evidence of the absence of my response
    - Phil Parkin

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