[英]MySQL SELECT Query with WHERE clause Not returning rows from two tables
[英]MySql - How to select MAX ID from two tables with WHERE clause
我有兩張表 invoice 和 invoice_customer。 兩者都有列 invoice_id,如 (0000125) 和firma_id(firma_id 是 company_id)我如何使用 WHERE caluse 對兩個表進行 select max invoice_id ? 我只查詢了單個表
SELECT MAX(invoice_id) AS maxID FROM invoice WHERE firma_id = 13
我是這樣做的
SELECT MAX(invoice_id) maxID
FROM
(
SELECT invoice_id FROM invoice WHERE firma_id = 13
UNION ALL
SELECT invoice_id FROM invoice_customers WHERE firma_id = 13
) test
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