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slb
Starting Member
4 Posts |
 Posted - 2008-10-15 : 11:47:00
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| This should be simple but my numbers are off. I have two tables, TableA has 2161 records where field ttype = 9 and in TableB I have 4766 records where ttype = 9 however I do not want to join them on this field but rather on the custID field. So I want to get all the records that are in TableA where ttype = 9 and the records from TableB where ttype = 9 and the custID in both tables match so this is my query:SELECT * FROM TABLEA LEFT OUTER JOIN TABLEB ON TABLEA.CUSTID = TABLEB.CUSTIDWHERE TABLEA.TTYPE = 9 AND TABLEB.TTYPE = 9So when I run this query the total number of records is 1854 but shouldn't it be 2161 since I'm getting all the records from TableA??What am I doing wrong?I've also tried SELECT * FROM TABLEA LEFT OUTER JOIN TABLEB ON TABLEA.CUSTID = TABLEB.CUSTIDWHERE TABLEA.TTYPE = 9 AND TABLEB.TTYPE = 9Which returns 3913 rows ???? |
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SwePeso
Patron Saint of Lost Yaks
30421 Posts |
Posted - 2008-10-15 : 11:48:45
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[code]SELECT *FROM TABLEALEFT JOIN TABLEB ON TABLEB.CUSTID = TABLEA.CUSTID AND TABLEB.TTYPE = 9WHERE TABLEA.TTYPE = 9[/code]
E 12°55'05.63"N 56°04'39.26" |
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visakh16
Very Important crosS Applying yaK Herder
52326 Posts |
Posted - 2008-10-15 : 11:49:58
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quote:
Originally posted by slb
This should be simple but my numbers are off. I have two tables, TableA has 2161 records where field ttype = 9 and in TableB I have 4766 records where ttype = 9 however I do not want to join them on this field but rather on the custID field. So I want to get all the records that are in TableA where ttype = 9 and the records from TableB where ttype = 9 and the custID in both tables match so this is my query:SELECT * FROM TABLEA LEFT OUTER JOIN TABLEB ON TABLEA.CUSTID = TABLEB.CUSTIDAND TABLEB.TTYPE = 9WHERE TABLEA.TTYPE = 9 So when I run this query the total number of records is 1854 but shouldn't it be 2161 since I'm getting all the records from TableA??What am I doing wrong?I've also tried SELECT * FROM TABLEA LEFT OUTER JOIN TABLEB ON TABLEA.CUSTID = TABLEB.CUSTIDWHERE TABLEA.TTYPE = 9 AND TABLEB.TTYPE = 9Which returns 3913 rows ????
modify like above |
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slb
Starting Member
4 Posts |
Posted - 2008-10-15 : 12:15:19
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| I changed the query but now it returns 2492 records not the 2161 I'm assuming it should return? |
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slb
Starting Member
4 Posts |
Posted - 2008-10-15 : 12:20:51
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| Never mind - tableB was displaying Null values which I don't want so changed the query to SELECT *FROM TABLEALEFT JOIN TABLEB ON TABLEB.CUSTID = TABLEA.CUSTID AND TABLEB.TTYPE = 9 AND TABLEB.TTYPE <> NULLWHERE TABLEA.TTYPE = 9and I got the right number of records!! THANK YOU!! |
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visakh16
Very Important crosS Applying yaK Herder
52326 Posts |
Posted - 2008-10-15 : 12:43:30
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quote:
Originally posted by slb
Never mind - tableB was displaying Null values which I don't want so changed the query to SELECT *FROM TABLEALEFT JOIN TABLEB ON TABLEB.CUSTID = TABLEA.CUSTID AND TABLEB.TTYPE = 9 AND TABLEB.TTYPE <> NULLWHERE TABLEA.TTYPE = 9and I got the right number of records!! THANK YOU!!
Are you having ANSI NULLS set to OFF? else use TABLEB.TTYPE IS NOT NULL instead of TABLEB.TTYPE <> NULL |
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raky
Aged Yak Warrior
767 Posts |
Posted - 2008-10-15 : 12:49:31
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quote:
Originally posted by slb
Never mind - tableB was displaying Null values which I don't want so changed the query to SELECT *FROM TABLEALEFT JOIN TABLEB ON TABLEB.CUSTID = TABLEA.CUSTID AND TABLEB.TTYPE = 9 AND TABLEB.TTYPE <> NULLWHERE TABLEA.TTYPE = 9and I got the right number of records!! THANK YOU!!
I think there is no need to check the condition TABLEB.TTYPE <> NULL in left outer join because you already set the TABLEB.TTYPE = 9 condition in left join.. |
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LEFT OUTER JOIN incorrect # of records