原文:mysql 一张表的多个字段关联另外一张表

SELECT vtiger orderitem.orderid, SELECT vtiger users.last name FROM vtiger users WHERE vtiger orderitem.signatory vtiger users.id AS signatory, SELECT vtiger users.last name FROM vtiger users WHERE v ...

2018-04-26 13:25 0 4801 推荐指数:

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mysql一张多个字段关联一张查询

如下:一张订单多个字段关联用户: 1.链表查询 SELECT cu.id AS 'id',cu.version AS 'version',cu.cid AS 'cid',cu.uid AS 'uid',cu.shopName AS 'shopName',cu.address ...

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MySQL查询一张有多少个字段

SQL如下 select count(*) from information_schema.COLUMNS where TABLE_SCHEMA='数据库名' and table_name='名'    ...

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