Question

我有三个表，例如

用户

+--+------+
|Id|Name  |
+--+------+
|1 |Ram   |
+--+------+
|2 |Rama  |
+--+------+
|3 |Leesa |
+--+------+
|4 |Kelvin|
+--+------+

作用

+--+-------+
|Id|Name   |
+--+-------+
|1 |Admin  |
+--+-------+
|2 |FA     |
+--+-------+
|3 |Testing|
+--+-------+
|4 |IT     |
+--+-------+

用户角色

+--+-------+-------+
|Id|User Id|Role Id|
+--+-------+-------+
|1 |1      |1      |
+--+-------+-------+
|2 |1      |2      |
+--+-------+-------+
|3 |2      |3      |
+--+-------+-------+
|4 |2      |1      |
+--+-------+-------+
|5 |3      |2      |
+--+-------+-------+
|6 |3      |3      |
+--+-------+-------+
|7 |4      |4      |
+--+-------+-------+
|8 |4      |2      |
+--+-------+-------+

从这3张表中我想要输出

+--+---------+--------+
|Id|User Name|Roles   |
+--+---------+--------+
|1 |Ram      |Admin,FA|
+--+---------+--------+

Answer 1

您可以通过创建存储过程来完成。

CREATE PROC UserRoles
(
    @UserId int
)

AS 
begin
DECLARE @roles NVARCHAR(MAX) = ''
SELECT @roles = @roles + ',' + t.Roles
  FROM (SELECT r.NAME AS Roles FROM [User Role] ur 
    Inner JOIN [ROLE] r ON r.Id = ur.RoleId 
    INNER JOIN User1 u ON u.Id = ur.UserID WHERE u.Id = @UserId) t
  SET @roles = RIGHT(@roles, LEN(@roles)-1)
SELECT u.Id AS ID, u.NAME AS UserName, @roles AS Roles FROM USER1 u WHERE u.Id = @UserId

end

Answer 2

我想为未来的SQL标准提出一些函数CONCATROWS。

SELECT page_id,CONCATROWS('\n',partext) AS pagetext FROM paragraph ORDER BY parposition GROUP BY page_id

我需要这个功能超过我可以计数的时间......不是我需要它很糟糕，但它会让生活变得如此简单。

sql server中三个表上的逗号分隔值

2 个答案: