多个查询同一个表但在不同的列mysql答案

【问题标题】：multiple query same table but in different columns mysql多个查询同一个表但在不同的列mysql
【发布时间】：2016-01-13 08:21:48
【问题描述】：

我正在尝试获取更多列来汇总 2 个不同表的结果

SET @start_res = 20150301;
SET @finish_res= 20150501;
SET @finish_check= 20150801;
SET @start_check= 20150301;
SET @daily_hos= 3;

SELECT* from
   ( SELECT COUNT(DAY_IN) AS arr FROM t_hospital WHERE DAY_IN between  @start_check and @finish_check and RES_DATE between @start_res and @finish_res  and ID_daily_hos =@daily_hos group by DAY_IN  )e,
     (SELECT COUNT(PAT_STATUS) AS ONG1 FROM t_hospital WHERE PAT_STATUS  like '%ong%' and  DAY_IN between @start_check and @finish_check and RES_DATE between @start_res and @finish_res  and ID_daily_hos =@daily_hos group by DAY_IN ) a,
        (SELECT COUNT(PAT_STATUS) AS RTED FROM t_hospital WHERE PAT_STATUS  like '%rtde%'and  DAY_IN between  @start_check and @finish_check and RES_DATE between @start_res and @finish_res  and ID_daily_hos =@daily_hos group by DAY_IN  )b,
           (SELECT COUNT(PAT_STATUS) AS POLI FROM t_hospital WHERE PAT_STATUS  like '%pol%'and DAY_IN between @start_check and @finish_check and RES_DATE between @start_res and @finish_res  and ID_daily_hos =@daily_hos group by DAY_IN   )c,
              (SELECT COUNT(PAT_STATUS) AS para FROM t_hospital WHERE PAT_STATUS  like '%para%' and  DAY_IN between @start_check and @finish_check and RES_DATE between @start_res and @finish_res  and ID_daily_hos =@daily_hos group by DAY_IN  )d

当然它不起作用，只有第一个显示的列 (arr) 有效，而其他列显示错误的输出。

我哪里错了？

【问题讨论】：

SELECT * FROM multiple tables. MySQL 的可能重复项...您需要将这些表连接在一起。
您的表 e、a、b、c、d 没有加入彼此

标签： mysql sql

【解决方案1】：

如果我理解正确，这就是你想要的。

SET @start_res = 20150301;
SET @finish_res= 20150501;
SET @finish_check= 20150801;
SET @start_check= 20150301;
SET @daily_hos= 3;

SELECT 

(SELECT COUNT(DAY_IN) FROM t_hospital WHERE 
DAY_IN between  @start_check and @finish_check and 
RES_DATE between @start_res and @finish_res and 
ID_daily_hos =@daily_hos) AS 'arr' ,

(SELECT COUNT(PAT_STATUS) FROM t_hospital WHERE 
PAT_STATUS  like '%ong%' and  
DAY_IN between @start_check and @finish_check and 
RES_DATE between @start_res and @finish_res  and 
ID_daily_hos =@daily_hos) AS 'ONG1' ,

(SELECT COUNT(PAT_STATUS) FROM t_hospital WHERE 
PAT_STATUS  like '%rtde%' and  
DAY_IN between  @start_check and @finish_check and 
RES_DATE between @start_res and @finish_res  and 
ID_daily_hos =@daily_hos) AS 'RTED' ,

(SELECT COUNT(PAT_STATUS) FROM t_hospital WHERE 
PAT_STATUS  like '%pol%' and 
DAY_IN between @start_check and @finish_check and 
RES_DATE between @start_res and @finish_res  and 
ID_daily_hos =@daily_hos) AS 'POLI' ,

(SELECT COUNT(PAT_STATUS) FROM t_hospital WHERE 
PAT_STATUS  like '%para%' and  
DAY_IN between @start_check and @finish_check and 
RES_DATE between @start_res and @finish_res  and 
ID_daily_hos =@daily_hos) AS 'para'

【讨论】：

【解决方案2】：

试试这个：-

SET @start_res = 20150301;
SET @finish_res= 20150501;
SET @finish_check= 20150801;
SET @start_check= 20150301;
SET @daily_hos= 3;

SELECT 

(SELECT COUNT(DAY_IN) AS arr FROM t_hospital WHERE 
DAY_IN between  @start_check and @finish_check and 
RES_DATE between @start_res and @finish_res and 
ID_daily_hos =@daily_hos) e,

(SELECT COUNT(PAT_STATUS) AS ONG1 FROM t_hospital WHERE 
PAT_STATUS  like '%ong%' and  
DAY_IN between @start_check and @finish_check and 
RES_DATE between @start_res and @finish_res  and 
ID_daily_hos =@daily_hos) a,

(SELECT COUNT(PAT_STATUS) AS RTED FROM t_hospital WHERE 
PAT_STATUS  like '%rtde%' and  
DAY_IN between  @start_check and @finish_check and 
RES_DATE between @start_res and @finish_res  and 
ID_daily_hos =@daily_hos)b,

(SELECT COUNT(PAT_STATUS) AS POLI FROM t_hospital WHERE 
PAT_STATUS  like '%pol%' and 
DAY_IN between @start_check and @finish_check and 
RES_DATE between @start_res and @finish_res  and 
ID_daily_hos =@daily_hos) c,

(SELECT COUNT(PAT_STATUS) AS para FROM t_hospital WHERE 
PAT_STATUS  like '%para%' and  
DAY_IN between @start_check and @finish_check and 
RES_DATE between @start_res and @finish_res  and 
ID_daily_hos =@daily_hos) d

您的问题提到了加入 2 个表，但似乎只有 t_hospital 有问题。您可能希望使用有关其他表的信息来更新您的问题。

【讨论】：

【解决方案3】：

这是一个很常见的模式：

SELECT DAY_IN, COUNT(*) AS arr,
        SUM(IF(PAT_STATUS  like '%ong%', 1, 0)) AS ONG1,
        SUM(IF(PAT_STATUS  like '%rtde%', 1, 0)) AS RTED,
        SUM(IF(PAT_STATUS  like '%pol%', 1, 0)) AS POL1,
        SUM(IF(PAT_STATUS  like '%para%', 1, 0)) AS para
FROM t_hospital 
WHERE DAY_IN between @start_check and @finish_check 
    and RES_DATE between @start_res and @finish_res  
    and ID_daily_hos =@daily_hos
GROUP BY DAY_IN

【讨论】：

这让我很开心。一旦你知道它就很容易......谢谢伙计！

【解决方案4】：

在 SQL Server 2005+ 中，您可以使用窗口函数。但 MySQL 不支持它。

在子查询中，选择语句必须有连接运算符。像这样：

SELECT * FROM (
    (SELECT COUNT(..) ...) AS C1
       INNER JOIN (SELECT COUNT(...) ...) AS C2
            ON <condition>
       INNER JOIN ... )

【讨论】：