neptune2528
asked on
SQL SUM Across Tables
OK, I have to write a query to sum the values returned from multiple tables. The details are as follows:
TABLE A contains the field I would like to sum, lets call it NUMBER in TABLE A. TABLE B contains a set of classifications for records in TABLE A. The field in TABLE B is CLASSIFICATION and can have the following values: CLASS 1, CLASS 2 and CLASS 3. A single record in TABLE A can, and will, have many classifications in TABLE B. For example, a single record in TABLE A can be CLASS 1, CLASS 2 and CLASS 3 and any combination thereof.
I want to be able to sum the NUMBER field from TABLE A across records that have related records in TABLE B for CLASS 1, CLASS 2 and CLASS 3. Please note in the example, the record in TABLE A must have all three classes to be valid for the summation. If it only has CLASS 1 and CLASS 2, then it should not be included.
Assume a simplified data model as follows:
TABLE A
- ID (unique identifier)
- NUMBER
TABLE B
- ID (relationship to TABLE A)
- Classification
TABLE A contains the field I would like to sum, lets call it NUMBER in TABLE A. TABLE B contains a set of classifications for records in TABLE A. The field in TABLE B is CLASSIFICATION and can have the following values: CLASS 1, CLASS 2 and CLASS 3. A single record in TABLE A can, and will, have many classifications in TABLE B. For example, a single record in TABLE A can be CLASS 1, CLASS 2 and CLASS 3 and any combination thereof.
I want to be able to sum the NUMBER field from TABLE A across records that have related records in TABLE B for CLASS 1, CLASS 2 and CLASS 3. Please note in the example, the record in TABLE A must have all three classes to be valid for the summation. If it only has CLASS 1 and CLASS 2, then it should not be included.
Assume a simplified data model as follows:
TABLE A
- ID (unique identifier)
- NUMBER
TABLE B
- ID (relationship to TABLE A)
- Classification
Last Comment
Sorry, typo on last join:
select
sum(mysum.number)
from
(
select id, number from tablea a inner join tableb b on a.id = b.id and a.classification = 'CLASS1'
UNION
select id, number from tablea a inner join tableb b on a.id = b.id and a.classification = 'CLASS2'
UNION
select id, number from tablea a inner join tableb b on a.id = b.id and a.classification = 'CLASS3'
) as mysum
inner join tableb bb
on bb.classification = 'CLASS1'
inner join tableb bbb
on bbb.classification = 'CLASS2'
inner join tableb bbbb
on bbbb.classification = 'CLASS3'
select
sum(mysum.number)
from
(
select id, number from tablea a inner join tableb b on a.id = b.id and a.classification = 'CLASS1'
UNION
select id, number from tablea a inner join tableb b on a.id = b.id and a.classification = 'CLASS2'
UNION
select id, number from tablea a inner join tableb b on a.id = b.id and a.classification = 'CLASS3'
) as mysum
inner join tableb bb
on bb.classification = 'CLASS1'
inner join tableb bbb
on bbb.classification = 'CLASS2'
inner join tableb bbbb
on bbbb.classification = 'CLASS3'
select result = sum(a.number)
from tableA a
join
(select ID from TableB where classification in ('CLASS 1','CLASS 2','CLASS 3') group by classification having count(distinct classification) = 3) b
on a.id = b.id
from tableA a
join
(select ID from TableB where classification in ('CLASS 1','CLASS 2','CLASS 3') group by classification having count(distinct classification) = 3) b
on a.id = b.id
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ASKER
nigelrivett,
I tried your last suggestion, but got an error reading there was a syntax error in the FROM clause. Any ideas?
I tried your last suggestion, but got an error reading there was a syntax error in the FROM clause. Any ideas?
looks ok can you post what you ran.
Do you know which from clause?
Do you know which from clause?
whoa - I seem to have drifted into the access forum
try
select result = sum(a.number)
from tableA a
join
(select ID from TableB where classification in ('CLASS 1','CLASS 2','CLASS 3') group by id having count(*) = 3) b
on a.id = b.id
try
select result = sum(a.number)
from tableA a
join
(select ID from TableB where classification in ('CLASS 1','CLASS 2','CLASS 3') group by id having count(*) = 3) b
on a.id = b.id
ASKER
nigelrivett,
I made a few changes to your suggestion and it worked well. As such, I will be accepting you previous selection. Thanks for your help.
I made a few changes to your suggestion and it worked well. As such, I will be accepting you previous selection. Thanks for your help.
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If you mean that they will and must have all of the classifications and the classification CLASS1, CLASS2 and CLASS3 is the olnu ones the following should work.
select
sum(mysum.number)
from
(
select id, number from tablea a inner join tableb b on a.id = b.id and a.classification = 'CLASS1'
UNION
select id, number from tablea a inner join tableb b on a.id = b.id and a.classification = 'CLASS2'
UNION
select id, number from tablea a inner join tableb b on a.id = b.id and a.classification = 'CLASS3'
) as mysum
inner join tableb bb
on bb.classification = 'CLASS1'
inner join tableb bbb
on bbb.classification = 'CLASS2'
inner join tableb bbbb
on bb.classification = 'CLASS3'
But I'm not sure if it's allowed to have a UNION in a derived table?
Regards
/Mattias