joshcallahan1
asked on
Access Deleting Duplicate Records Only When They meet Special Conditions
Hi,
I'm running into what seems to be a simple problem but I can't figure it out and I'm done pulling my hair out.
I have a Table1 with two fields, Field1 & Field2. Field1 has some duplicate values in it. Field2 has only value 'X' and value 'Y'.
I need a simple way of deleting all the records which have a duplicate values in Field1 that have a field2 value of 'X'.
There is one more condtion, I only want to delete the records which have dulpicate values in Field1 but also have field2 values of both 'X' and 'Y'.
This is best explained by example. Below is an sample table. There are three duplicate values in Field1, '111' and '222' and '333'.
Record 1 would be deleted because it's a duplicate with a value of 'X' in field2 and record 5, the dulplicate has a value of 'Y'. I only want to delete the records with dups in field1 that have at least one record with a field2 value 'X' and at least one record with a field2 value of 'Y'.
In this example neither record 2 or 6 would be deleted since there is no records with a field1 value of '222' and a field2 value of 'X'. The same is true for Records 7 & 8 which are dups in field1 but none of the records have a field2 value of 'Y'.
Record Field1 Field2
1 111 X
2 222 Y
3 333 X
4 444 X
5 111 Y
6 222 Y
7 333 X
8 333 X
Guess that was not as easy as I thought it would be. 500 point to the winner!!! Thanks a bunch,
Josh
I'm running into what seems to be a simple problem but I can't figure it out and I'm done pulling my hair out.
I have a Table1 with two fields, Field1 & Field2. Field1 has some duplicate values in it. Field2 has only value 'X' and value 'Y'.
I need a simple way of deleting all the records which have a duplicate values in Field1 that have a field2 value of 'X'.
There is one more condtion, I only want to delete the records which have dulpicate values in Field1 but also have field2 values of both 'X' and 'Y'.
This is best explained by example. Below is an sample table. There are three duplicate values in Field1, '111' and '222' and '333'.
Record 1 would be deleted because it's a duplicate with a value of 'X' in field2 and record 5, the dulplicate has a value of 'Y'. I only want to delete the records with dups in field1 that have at least one record with a field2 value 'X' and at least one record with a field2 value of 'Y'.
In this example neither record 2 or 6 would be deleted since there is no records with a field1 value of '222' and a field2 value of 'X'. The same is true for Records 7 & 8 which are dups in field1 but none of the records have a field2 value of 'Y'.
Record Field1 Field2
1 111 X
2 222 Y
3 333 X
4 444 X
5 111 Y
6 222 Y
7 333 X
8 333 X
Guess that was not as easy as I thought it would be. 500 point to the winner!!! Thanks a bunch,
Josh
Run QDelete from sample
DBdupl.mdb
DBdupl.mdb
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Exactly correct and the cleanest way possible. Awsome!! FYI below is the code for the example table:
DELETE *
FROM Table1 where ID in (select Xs.ID from Table1 AS Xs INNER JOIN Table1 AS Ys ON Xs.Field1 = Ys.Field1
WHERE (((Xs.Field2)="X") AND ((Ys.Field2)="Y")))
DELETE *
FROM Table1 where ID in (select Xs.ID from Table1 AS Xs INNER JOIN Table1 AS Ys ON Xs.Field1 = Ys.Field1
WHERE (((Xs.Field2)="X") AND ((Ys.Field2)="Y")))
nice one.
there might be a way to do the delete straight from the xs alias, withouth needing to have in(select XS.id...),
but i might be thinking of SQL server Tsql not Jet SQL.
either way it works, so well done :)
there might be a way to do the delete straight from the xs alias, withouth needing to have in(select XS.id...),
but i might be thinking of SQL server Tsql not Jet SQL.
either way it works, so well done :)
where field2 = "X"
and exists (select * from yourtable t2 where t1.field1=t2.field1 and t2.field2 = "Y")