Yesmin Patwary wrote:
Dear All,
Need to find ids that are NOT in other two tables. With the help of PHP scripting and three queries I am able to do the task. Can this be done with one mysql query?
Below are current quires:
SELECT DISTINCT company_id FROM company_db
SELECT company_id FROM person WHERE company_id=\"$company_id\"
SELECT company_id FROM customer WHERE company_id=\"$company_id\"
Use outer joins:
SELECT DISTINCT c.company_id
FROM company_db c
LEFT JOIN person p
ON c.company_id = p.company_id
LEFT JOIN customer cu
ON c.company_id = cu.company_id
WHERE p.company_id IS NULL
AMD cu.company_id IS NULL;
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