php – 如何统一这些mysql查询？这样做有意义吗？

发布时间：2020-12-13 16:51:44 所属栏目：PHP教程来源：网络整理

导读：我正在为我的数据库构建一般统计数据. 我想知道如何联合这么多SELECTS,以便得到1行不同列的结果. SELECT COUNT(*) AS total_users FROM users;SELECT COUNT(*) AS total_verified FROM users WHERE verified = 1;SELECT COUNT(*) AS total_passed_tut FROM u

我正在为我的数据库构建一般统计数据.

我想知道如何联合这么多SELECTS,以便得到1行不同列的结果.

SELECT COUNT(*) AS total_users FROM users;
SELECT COUNT(*) AS total_verified FROM users WHERE verified = 1;
SELECT COUNT(*) AS total_passed_tut FROM users WHERE level = 3;
SELECT COUNT(*) AS total_private FROM users WHERE privacy = 0;
SELECT COUNT(*) AS total_friends_only FROM users WHERE privacy = 2;
SELECT COUNT(*) AS total_public FROM users WHERE privacy = 3;

这样做有意义吗？或者我应该做单独的查询并保存到数组1？

解决方法

您可以在一个查询中执行此操作

SELECT COUNT(*) AS total_users,sum(verified = 1) as total_verified,sum(level = 3) as total_passed_tut,sum(privacy = 0) as total_private,sum(privacy = 2) as total_friends_only,sum(privacy = 3) as total_public
FROM users;

（编辑：李大同）

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