I have a table A and table B of the same type as
CREATE TABLE A (
`file` varbinary(255) not null,
`digest` binary(40) not null
)
CREATE TABLE B (
`file` varbinary(255) not null,
`digest` binary(40) not null
)
I have another table C of the following type
CREATE TABLE C (
`file` varbinary(255) not null,
`digest` binary(40) not null,
`refcount` bigint(20) not null
)
I need to write a query where for the same file and digest in table A and table
B, the refcount is table C is not the same. So:
SELECT COUNT(*) as count 1 FROM A WHERE file='file1' AND digest='digest1';
SELECT COUNT(*) as count 2 FROM B WHERE file='file1' AND digest='digest1';
and then adding up the two counts from these queries and comparing it with the
result of the following query:
SELECT refcount FROM C WHERE file='file1' AND digest='digest1';
basically (refcount == (count1 + count2)) should be true and I am interested in
finding out all such records in table C where this is not the case.
Thanks
Aveek
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