[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
我有两张表 invoice 和 invoice_customer。 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 ? 我只查询了单个表
SELECT MAX(invoice_id) AS maxID FROM invoice WHERE firma_id = 13
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
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.