I have a set of string & numbers that I d like to use between databases.
the idea is that table A has a row of data with 2 values acting as a single primary key
Table B has the same 2 values of data in a single row, or it doesn t...
So...
Id like to find out how many values from Table A (2 column values in a single row) match in column B (2 column values in a single row equal to A s values)
any thoughts?
I don t think you need the nested SELECT statement. This should do the trick:
SELECT
COUNT(a.*)
FROM
TableA a,
TableB b
WHERE
a.Col1 = b.Col1 AND
b.Col2 = b.Col2
Assuming that by "databases" you mean "tables", that by "values from Table A" you mean "rows from table A", and that by "column B" you mean "table B", then:
SELECT COUNT(*) FROM TableA WHERE EXISTS
(SELECT * FROM TableB WHERE TableB.Col1 = TableA.Col1
AND TableB.Col2 = TableA.Col2)
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