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Thread: exclude zero

  1. #1

    Thread Starter
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    exclude zero

    hello!
    how would i exclude zero pls see sample below:
    col1 - col2
    0 - 1
    0 - 3
    1 - 2
    2 - 2
    3 - 3
    4 - 4

    select min(col1),min(col2) from table where col1<>0;

    results:
    1-2 supposedly it is 1-1
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    VB6,PHP,VS 2005

  2. #2
    PowerPoster TysonLPrice's Avatar
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    Re: exclude zero

    Quote Originally Posted by basti42
    hello!
    how would i exclude zero pls see sample below:
    col1 - col2
    0 - 1
    0 - 3
    1 - 2
    2 - 2
    3 - 3
    4 - 4

    select min(col1),min(col2) from table where col1<>0;

    results:
    1-2 supposedly it is 1-1
    SQL 2000 - This is just based on what you posted:

    Code:
    create table #testIt(col1 int,col2 int)
    insert into #TestIt(col1,col2) values(0,1)
    insert into #TestIt(col1,col2) values(0,3)
    insert into #TestIt(col1,col2) values(1,2)
    insert into #TestIt(col1,col2) values(2,2)
    insert into #TestIt(col1,col2) values(3,3)
    insert into #TestIt(col1,col2) values(4,4)
    
    select min(t1.col1),min(t2.col2)
    from #TestIt t1, #TestIt t2
    where t1.col1<>0
    and t1.col1<>0
    
    drop table #testIt

  3. #3
    Super Moderator si_the_geek's Avatar
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    Re: exclude zero

    Thread moved to Database Development forum - which is where SQL questions belong

  4. #4
    Super Moderator FunkyDexter's Avatar
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    Re: exclude zero

    I think you'd need a pair of sub-selects for that:-
    Code:
    Select
       (Select min(col1) from table where col1 <> 0),
       (Select min(col2) from table where col2 <> 0)
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  5. #5
    Head Hunted anhn's Avatar
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    Re: exclude zero

    Another way:
    Code:
    SELECT Min(IIf(col1<>0,col1,Null)) AS Min1, Min(IIf(col2<>0,col2,Null)) AS Min2 
    FROM Table1;
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  6. #6
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    Re: exclude zero

    In terms of SQL tuning/optimization....

    Post #2: Additional overhead from table join (intermediate table).
    Post #5: Additional overhead from full table scan. All records (or all index entries whichever is applicable) have to be retrieved, checked, and possibly column value converted to NULL.
    Post #4: I would recommend this query if an index exists on relevant columns since then only the index is scanned (less disk I/O, and b-tree or r-tree scanning of index).

    If relevant index exists, preference is post 4, 2, 5. If no index exists (you will end up doing a full table scan whatever the query), preference is post 5, 4, 2.

  7. #7
    PowerPoster TysonLPrice's Avatar
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    Re: exclude zero

    Quote Originally Posted by anhn
    Another way:
    Code:
    SELECT Min(IIf(col1<>0,col1,Null)) AS Min1, Min(IIf(col2<>0,col2,Null)) AS Min2 
    FROM Table1;
    The OP never said what DB was being used. This won't sysntax check on SQL 2000. Is that access?

  8. #8
    Super Moderator FunkyDexter's Avatar
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    Re: exclude zero

    Is that access?
    Yes but you could achieve the same thing using case in sqlserver. Either way though, I'd recommend the query I posted instead. It's more readable and it should perform better too.
    When one of my minions says, "Hey, he's just one guy, what can he do?" I say "This"... and shoot them.

    The problem with putting your lair in a volcano is keeping your robot army from melting.

    I know that the human being and the fish can coexist peacefully - George Bush

  9. #9
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    Re: exclude zero

    Performance varies depending on how database, tables, indexes, and the data itself. There is no such thing as a one size fits all approach to writing efficient SQL.

  10. #10
    PowerPoster TysonLPrice's Avatar
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    Re: exclude zero

    Quote Originally Posted by leinad31
    Performance varies depending on how database, tables, indexes, and the data itself. There is no such thing as a one size fits all approach to writing efficient SQL.
    True...plus the compiler, at least SQL 2005, sometimes has a mind of it's own.

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