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Data from table1 where no match on Table2

Posted on 2009-05-15
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Last Modified: 2012-05-07
I would like to write a query which bring back all the data from table1 where there is match in table2.

The match uses a primary key called TableJoinKey

can anybody help.

Thanks
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Question by:Mr_Shaw
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8 Comments
 
LVL 143

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 100 total points
ID: 24393676
simply join:
select t1.*
  from table1 t1
 where exists ( select null from table2 t2 where t2.TableJoinKey = t1.tableJoinkey ) 

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Author Comment

by:Mr_Shaw
ID: 24393714
what would happen if i used a left or right join
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LVL 31

Assisted Solution

by:RiteshShah
RiteshShah earned 400 total points
ID: 24393796
you can use this one also.

select t1.* from table1 t1 left join table2 t2 on t1. TableJoinKey  =t2. TableJoinKey  where t2.fieldone=NULL
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LVL 31

Assisted Solution

by:RiteshShah
RiteshShah earned 400 total points
ID: 24393806
above query will return only records not match with table2, if you want records with match, use this one.


select t1.* from table1 t1 left join table2 t2 on t1. TableJoinKey  =t2. TableJoinKey  where t2.fieldone is not NULL
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LVL 31

Assisted Solution

by:RiteshShah
RiteshShah earned 400 total points
ID: 24393839
you can use AngelIII's solution also,

for records match:

select t1.*
  from table1 t1
 where exists ( select null from table2 t2 where t2.TableJoinKey = t1.tableJoinkey )


for records not match:

select t1.*
  from table1 t1
 where not exists ( select null from table2 t2 where t2.TableJoinKey = t1.tableJoinkey )
0
 

Author Comment

by:Mr_Shaw
ID: 24393856
ok i'll have a play arround...

Please could someone tell me what would happen if I used a left or right join.
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LVL 31

Assisted Solution

by:RiteshShah
RiteshShah earned 400 total points
ID: 24393877
if you use left join than you will get all records from table 1 and records doesn't match with table1, will come as NULL in table2. have a look at following query.

select t1.* from table1 t1 left join table2 t2 on t1. TableJoinKey  =t2. TableJoinKey

reverse process than above if you use right join.
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Author Closing Comment

by:Mr_Shaw
ID: 31581849
Thanks
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