mysql - 如何在单个过程中编写多个选择查询？

Question

我必须将表格设置为：table1：

UID | COLLEGE_NAME | COLLEGE_ADDRESS
------------------------------------

表2：

UID | COMPANY_NAME | COMPANY_ADDRESS
------------------------------------

我有 2 个查询：

select * from table1 where uid='$uid';   
select * from table2 where uid='$uid';

我想在一个过程中编写这两个查询。

Answer 1

单个过程中多个选择查询的结构：

CREATE PROCEDURE样本（l_uid INT）BEGIN

SELECT* FROMCollege_edu WHEREuid=l_uid;

SELECT* FROMwork_experience WHEREuid=l_id;

END

Answer 2

这是要创建的语句STORED PROCEDURE。

DELIMITER $$
CREATE PROCEDURE procedureName(IN _uid VARCHAR(15))
BEGIN
    SELECT UID, COLLEGE_NAME name, COLLEGE_ADDRESS address
    FROM    table1
    WHERE uid = _uid
    UNION ALL
    SELECT UID, COMPANY_NAME name, COMPANY_ADDRESS address
    FROM    table2
    WHERE uid = _uid
END $$
DELIMITER ;

请注意上面UNION有ALL关键字以在结果列表中添加重复记录。但如果您愿意UNIQUE，请删除 上的ALL关键字UNION。

Answer 3

下面的代码可能会为您服务。此外，额外的 tbl 列将让您知道您的数据来自哪个表，这将有助于进一步操作。

 SELECT UID, COLLEGE_NAME name, COLLEGE_ADDRESS address , 1 as tbl
    FROM    table1
    WHERE uid = _uid
    UNION ALL
    SELECT UID, COMPANY_NAME name, COMPANY_ADDRESS address , 2 as tbl
    FROM    table2
    WHERE uid = _uid