在多个表中搜索相同的值

问题描述

我有一个带有几个表的MYSQL数据库，所有表都具有相同的结构.我想搜索所有表以找到具有特定值的列的行.我必须一一搜索表格还是有一种更简单的方法?

I have a MYSQL database with a few tables, all of which have the same structure. I want to search all the tables to find a row with a specific value for a column. Do I have to search the tables one by one or there is an easier way?

推荐答案

您可以合并所有表.您仍然需要一张一张地遍历所有表，但是在union的情况下，您将不会进行笛卡尔乘法，因此从所有方面来看都是最好的:

You can union all tables. You still need traverse all tables one by one, but in case of union you will not have cartesian multiplication, hence best from all:

SELECT column FROM table1 WHERE column = 'value'
UNION ALL
SELECT column FROM table2 WHERE column = 'value'
;

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