Question

我有用户表，用户可以拥有以下三种状态之一：

active (0)
inactive (1)
banned (2)

是否可以单独计算所有类型的用户，并且只允许用户在一个查询中选择状态。例如，我想显示有多少用户处于活动/非活动/禁用状态并显示所有活动用户？

表结构很简单：

id | firstName | lastName | email | password | status

I am trying to achieve something like this:

Active Users (10) | Inactive Users (2) | Banned Users (7)

List of all active users:

1) John Doe
2) John Doe
3) John Doe...

Answer 1

单一查询无法获得预期的输出！

您可以使用

获取status概述

SELECT 
    SUM(CASE WHEN status = 0 THEN 1 ELSE 0 END) AS active_users,
    SUM(CASE WHEN status = 1 THEN 1 ELSE 0 END) AS inactive_users,
    SUM(CASE WHEN status = 2 THEN 1 ELSE 0 END) AS banned_users
FROM users

status = 0（有效）的所有用户都可以使用以下

SELECT * FROM users
WHERE status = 0

Answer 2

Sebastian Brosch 答案的简短版本：

SELECT 
    SUM(status = 0) AS active_users, 
    SUM(status = 1) AS inactive_users, 
    SUM(status = 2) AS banned_users 
FROM users;

MySQL - 根据一个查询中的状态计算活动/非活动/禁用用户并选择用户

2 个答案: