MySQL-根據同一列的不同值計算總記錄

Question

我有一張如下表

表用戶

id                name                   status                     flag                   country
====================================================================================================
1                  AB                       1                          0                     US
2                  BC                       1                          0                     UK
3                  CD                       0                          0                     IN
4                  DE                       3                          0                     BR
5                  EF                       3                          0                     UK
6                  FG                       2                          0                     IN
7                  GH                       4                          0                     IN

我想數數。 的記錄，其中

status = 1 作為totalactiverecords ，

status = 0 作為totalinactiverecords ，

status = 3 作為totalrecentactiverecords ，

status = 2 作為totalemailnotverifiedrecords ，

status = 4 作為totalemailverifiedrecords ,

， country是UK ，都在一個SELECT聲明中。

有什么具體的方法嗎？

我想到了類似的東西

SELECT COUNT(*) as totalactiverecords  WHERE status=1 
        COUNT(*) as totalinactiverecordsWHERE status=0,
        COUNT(*) as totalemailnotverifiedrecords WHERE status=2,
        COUNT(*) as totalrecentactiverecords WHERE status=3,
        COUNT(*) as totalemailverifiedrecords WHERE status=4

FROM table_user where country=IN

，但這似乎不起作用。

Answer 1

你可以試試這個查詢：

SELECT count(case status when '1' then 1 else null end) as totalactiverecords,
    count(case status when '0' then 1 else null end) as totalinactiverecords,
    count(case status when '2' then 1 else null end) as totalemailnotverifiedrecords,
    count(case status when '3' then 1 else null end) as totalrecentactiverecords,
    count(case status when '4' then 1 else null end) as totalemailverifiedrecords 
FROM table_user where country='IN'

Answer 2

我通常在這類問題中使用CASE WHEN ：

SELECT sum(case when status = 1 then 1 end) as totalactiverecords,
COUNT sum(case when status = 0 then 1 end) as totalinactiverecords,
COUNT sum(case when status = 2 then 1 end) as totalemailnotverifiedrecord,
COUNT sum(case when status = 3 then 1 end) as totalrecentactiverecords,
COUNT sum(case when status = 4 then 1 end) as totalemailverifiedrecords
FROM table_user where country=IN