how to return records in squence of inner join table?

Question

how to return records in squence of inner join table?

jdp12383

Old Hand

Points: 337
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September 10, 2010 at 5:53 am

#227640

Hi,
I have test database with following script. I am trying to explain my problem with this sample db script. I am creating a temp. table with the ordered column from other table and then using that table to join the other table. If you notice the output of the below select query, the returned rows from first table are in the sequence of insertion not in the sequence of the temp. table.
Is there any other way to retrieve rows in the sequence of temp. (joined) table?
CREATE TABLE [dbo].[Table_2](
[c1] [int] NULL,
[c2] [nvarchar](50) NULL
) ON [PRIMARY]
GO
INSERT [dbo].[Table_2] ([c1], [c2]) VALUES (1, N'z')
INSERT [dbo].[Table_2] ([c1], [c2]) VALUES (2, N'y')
INSERT [dbo].[Table_2] ([c1], [c2]) VALUES (3, N'x')
INSERT [dbo].[Table_2] ([c1], [c2]) VALUES (4, N'a')
INSERT [dbo].[Table_2] ([c1], [c2]) VALUES (5, N'b')
INSERT [dbo].[Table_2] ([c1], [c2]) VALUES (6, N'c')
CREATE TABLE [dbo].[Table_1](
[c1] [int] NULL,
[c2] [nvarchar](50) NULL
) ON [PRIMARY]
GO
INSERT [dbo].[Table_1] ([c1], [c2]) VALUES (3, N'x')
INSERT [dbo].[Table_1] ([c1], [c2]) VALUES (2, N'y')
INSERT [dbo].[Table_1] ([c1], [c2]) VALUES (1, N'z')
INSERT [dbo].[Table_1] ([c1], [c2]) VALUES (6, N'c')
INSERT [dbo].[Table_1] ([c1], [c2]) VALUES (5, N'b')
INSERT [dbo].[Table_1] ([c1], [c2]) VALUES (4, N'a')
----------------------------------------------------
IF OBJECT_ID('TempDB..#tblTemp','U') IS NOT NULL
DROP TABLE #tblTemp
CREATE TABLE #tblTemp (Id int);
INSERT INTO #tblTemp SELECT c1 FROM Table_2 ORDER BY c2
SELECT *
FROM Table_1
INNER JOIN #tblTemp ON Id=Table_1.c1
DROP TABLE #tblTemp
Regards,
Jigs

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Gail Shaw SSC Guru Points: 1004504 More actions · Answer 1

If you want to retrieve rows in a particular order, you must put an ORDER BY on the statement that retrieves the data with the appropriate columns listed

An order by on the insert only affects identity columns (if present). It does not guarantee the order that data will be returned from that table

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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ChrisM@Work SSC Guru Points: 186127 More actions · Answer 2

There is no guarantee that rows will be returned in any particular unless ORDER BY is specified.

There is also no guarantee that rows will be inserted in a particular order, even if the inserts are sourced as SELECT...ORDER BY...

http://sqlblogcasts.com/blogs/sqlandthelike/archive/2010/06/27/sql-101-without-order-by-order-is-not-guaranteed.aspx

^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden