Concatenate multiple rows

Question

I'm using Microsoft SQL Server 2005.

I think I need a sub-query.

I'm looking for one (1) row per customer, with the AvailableAction field be a concatenation of all the Actions for each customer.

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,ActionID) VALUES(1,102)
INSERT INTO CustAction(CustID,ActionID) VALUES(2,102)
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,CustName,
'<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

I would like the output to be:

CustID AvailableAction

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

harpo · Accepted Answer · 2010-07-07 18:41:46Z

3

For 2005+

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

I don't think you'll be able to get this with FOR XML EXPLICIT, so if this is 2000 you're out of luck (as far as simple solutions go).

answered Jul 7, 2010 at 18:41

harpo

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Martin Smith · Accepted Answer · 2010-07-07 18:30:10Z

1

Here's a way that I'm sure will be bettered by someone that knows SQL Server XML!

 SELECT CustID  ,
       CustName,
       REPLACE(REPLACE(
       ( SELECT '<option value="' + CAST(ACTION.ActionID AS VARCHAR) + '">' + ActionName + '</option>'
       FROM    ACTION
               JOIN CustAction
               ON      CustAction.CustID = Cust.CustID
       WHERE   CustAction.ActionID       = ACTION.ActionID FOR XML PATH('')
       )
       ,'&lt;','<'),'&gt;','>') AvailableAction
FROM   Cust

answered Jul 7, 2010 at 18:30

Martin Smith

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