sql – 连接多行

我正在使用Microsoft sql Server 2005.

我想我需要一个子查询.

我正在为每个客户寻找一(1)行,其中AvailableAction字段是每个客户的所有操作的串联.

use tempdb
GO
IF DB_ID('myDatabase') IS NOT NULL
  DROP DATABASE myDatabase
go
CREATE DATABASE myDatabase 
GO
USE myDatabase
GO
create table Cust(
CustID Int Identity Primary Key,CustName Varchar(255)
)
GO
INSERT INTO Cust(CustName) values('One')
INSERT INTO Cust(CustName) values('Two')
GO
CREATE TABLE Action(
ActionID Int Identity(101,1) Primary Key,ActionName Varchar(128)
)
GO
INSERT INTO Action(ActionName) VALUES('Insert')
INSERT INTO Action(ActionName) VALUES('Update')
INSERT INTO Action(ActionName) VALUES('Delete')
INSERT INTO Action(ActionName) VALUES('Print')
GO
create table CustAction(
CustActionID Int Identity Primary Key,CustID Int,ActionID Int
)
GO
INSERT INTO CustAction(CustID,ActionID) VALUES(1,101)
INSERT INTO CustAction(CustID,102)
INSERT INTO CustAction(CustID,ActionID) VALUES(2,103)
GO
SELECT Cust.CustID,CustName,ActionName
FROM CustAction
JOIN Cust
ON CustAction.CustID = Cust.CustID
JOIN Action
ON CustAction.ActionID = Action.ActionID
GO
SELECT 
Cust.CustID,'<option value="' + CAST(Action.ActionID AS Varchar) + '">' + ActionName + '</option>' AS AvailableAction
FROM CustAction
JOIN Cust
ON CustAction.CustID = Cust.CustID
JOIN Action
ON CustAction.ActionID = Action.ActionID

我希望输出为：

CustID AvailableAction

    1  <option value="101">Insert</option><option value="102">Update</option>
    2  <option value="102">Update</option><option value="103">Delete</option>

解决方法

2005年

SELECT CustID,(SELECT ca.ActionID [@value],ActionName [text()]
          FROM dbo.CustAction ca
         INNER JOIN dbo.Action ON ca.ActionID = Action.ActionID
         WHERE ca.CustID = c.CustID
           FOR XML PATH('option'),TYPE) AvailableAction
  FROM dbo.Cust c

我不认为你能用FOR XML EXPLICIT得到这个,所以如果这是2000你就不走运了(就简单的解决方案而言).

原文地址：https://www.jb51.cc/mssql/83786.html