Question

我有一个具有以下结构的表“任务”

[TaskId],[CompanyId], [Year], [Month], [Value]
220,1,2018,1,50553.32
220,2,2018,2,222038.12

和另一个表，其中用户有权访问名为“ UsersCopmpanies”的表中的特定公司

[UserId], [CompanyId]
1,1

这是任务编号。公司之间转移了220。一月份的任务属于copmanyId = 1，比二月份的任务属于copmanyId = 2。

根据“ UsersCopmpanies”表，用户没有compnayid = 2的权限。

我需要做的是从“任务”表的“期望值”字段中获取两行，因为用户没有权限。预期结果应为：

[TaskId], [CompanyId], [Year], [Month],[Value]
220,1,2018,1,50553.32
220,2,2018,2,(NULL or somenthing else for.example string 'lack of permission')

Answer 1

您可以使用List<Date[]>：

left join

Answer 2

我认为使用LEFT JOIN进行此查询可以按您期望的方式工作：

CREATE TABLE #MyTasks  
(TaskId   int,  
   CompanyId      int,
   YearCol varchar(50),
   MonthCol varchar(50),
   SomeValue varchar(50)
  );  
GO  

INSERT INTO #MyTasks 
SELECT 220,1,2018,1,50553.32
UNION
SELECT 220,2,2018,2,222038.12

CREATE TABLE #MyUsersCopmpanies
(UserId   int PRIMARY KEY,  
   CompanyId      varchar(50) 
  );  
GO  



INSERT INTO #MyUsersCopmpanies 
SELECT 1,1


DECLARE  @MyUserParam INT = 1;

SELECT #MyTasks.TaskId, #MyTasks.CompanyId, #MyTasks.YearCol, #MyTasks.MonthCol, 
    CASE WHEN #MyUsersCopmpanies.UserId IS NOT NULL THEN  #MyTasks.SomeValue ELSE 'lack of permission' END AS 'ValueTaskByPermissions'
FROM #MyTasks 
LEFT JOIN #MyUsersCopmpanies ON #MyUsersCopmpanies.CompanyId = #MyTasks.CompanyId AND #MyUsersCopmpanies.UserId = @MyUserParam;


DROP TABLE  #MyTasks

DROP TABLE  #MyUsersCopmpanies

结果：

TaskId  CompanyId   YearCol MonthCol    ValueTaskByPermissions
220             1      2018        1    50553.32
220             2      2018        2    lack of permission

Answer 3

一些代码：

SELECT t.taskid,t.companyid,t.year,t.month, 
       (CASE WHEN u.companyid IS NOT NULL THEN t.value ELSE "lack of permission" end) AS ValueData 
FROM `x_task` t LEFT JOIN x_userscopmpanies u ON u.companyid = t.companyid

需要帮助的手，需要一些复杂的查询

3 个答案: