[英]MySql - How to select MAX ID from two tables with WHERE clause
I have two tables invoice and invoice_customer.我有两张表 invoice 和 invoice_customer。 Both have column invoice_id like (0000125) and firma_id (firma_id is a company_id) How can i select max invoice_id of two tables with using WHERE caluse?两者都有列 invoice_id,如 (0000125) 和firma_id(firma_id 是 company_id)我如何使用 WHERE caluse 对两个表进行 select max invoice_id ? i done query for single table only我只查询了单个表
SELECT MAX(invoice_id) AS maxID FROM invoice WHERE firma_id = 13
I done this way我是这样做的
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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