SQL Server SELECT Sequential Data, Breaking Lines at any Column Diference - sql

Question

I posted a question at MSDN (Brazilian) site. My problem is that I want to make a select at a table that returns a first and last number (from a column) WITHOUT INTERRUPTION and WITHOUT CHANGES on other columns related on the search.
QUESTION UPDATE (2015-04-23)
I've updated my own post on MSDN as on this link. I made a SELECT that would give me almost what i want - but 1 line for the first and 1 line for the final number on each range. It is breaking perfectly, so when the Diag column is O (letter O) means that there is no other number on the range (as O stands for "Only"), so the number would be both initial and final. When the Diag column ins ´F´ is the first number of the range, and due to the ´ORDER BY´ arguments, the last number of that range (as you may guess, with an ´L´ for LAST on the Diag column) is right below it, on the next line. My task now is to create 1 more column on it and then repeated the enNumber field when Diag is O, place the next line ´enNumber´ value when the ´Diag´ column where ´F´ and eliminate all lines with ´L´ on the ´Diag´ column.
SELECT
[EnT].enPrefix,
[EnT].enNumber,
[EnT].enOrder,
[EnT].enDate,
[EnT].enNfe,
[EnT].enClient,
(CASE
WHEN [EnN].enNumber IS NULL THEN
CASE
WHEN [EnP].enNumber IS NULL THEN 'O'
ELSE 'L'
END
ELSE 'F'
END) AS [Diag]
FROM
SerialsDB.dbo.Entries AS [EnT]
LEFT OUTER JOIN SerialsDB.dbo.Entries AS [EnN]
ON ([EnT].enProduct = [EnN].enProduct) AND
([EnN].enNumber = [EnT].enNumber + 1) AND
([EnN].enOrder = [EnT].enOrder) AND
([EnN].enClient = [EnT].enClient) AND
([EnN].enNfe = [EnT].enNfe) AND
([EnN].enDate = [EnT].enDate)
LEFT OUTER JOIN SerialsDB.dbo.Entries AS [EnP]
ON ([EnT].enProduct = [EnP].enProduct) AND
([EnP].enNumber = [EnT].enNumber - 1) AND
([EnP].enOrder = [EnT].enOrder) AND
([EnP].enClient = [EnT].enClient) AND
([EnP].enNfe = [EnT].enNfe) AND
([EnP].enDate = [EnT].enDate)
WHERE
([EnT].enOrder IS NOT NULL) AND
([EnT].enClient IS NOT NULL) AND
(([EnP].enNumber IS NULL) OR
([EnN].enNumber IS NULL))
ORDER BY
[EnT].enOrder ASC,
[EnT].enDate ASC,
[EnT].enNfe ASC,
[EnT].enPrefix ASC,
[EnT].enNumber ASC
Help!

Answer 1

This is not going to be a simple query using a GROUP BY.
For simplicity and to show the basic idea I assume Entries table just got two columns: enNumber and enProduct. You can add all other columns and criteria later.
CREATE TABLE [Entries](
[enNumber] [int] NOT NULL,
[enProduct] [int] NOT NULL,
CONSTRAINT [PK_Entries] PRIMARY KEY CLUSTERED ([enNumber] ASC) ON [PRIMARY]
) ON [PRIMARY]
GO
INSERT INTO [Entries] VALUES (1000309,2768)
INSERT INTO [Entries] VALUES (1000310,2768)
INSERT INTO [Entries] VALUES (1000311,2768)
INSERT INTO [Entries] VALUES (1000312,2768)
INSERT INTO [Entries] VALUES (1000313,2768)
INSERT INTO [Entries] VALUES (1000314,2768)
INSERT INTO [Entries] VALUES (1000315,2768)
INSERT INTO [Entries] VALUES (1000316,2768)
INSERT INTO [Entries] VALUES (1000317,2768)
/* interrupt */
INSERT INTO [Entries] VALUES (1001388,3328)
INSERT INTO [Entries] VALUES (1001389,3328)
INSERT INTO [Entries] VALUES (1001390,3328)
INSERT INTO [Entries] VALUES (1001391,3328)
INSERT INTO [Entries] VALUES (1001392,3328)
/* change */
INSERT INTO [Entries] VALUES (1001393,3743)
INSERT INTO [Entries] VALUES (1001394,3743)
INSERT INTO [Entries] VALUES (1001395,3743)
INSERT INTO [Entries] VALUES (1001396,3743)
/* change */
INSERT INTO [Entries] VALUES (1001397,3328)
INSERT INTO [Entries] VALUES (1001398,3328)
INSERT INTO [Entries] VALUES (1001399,3328)
INSERT INTO [Entries] VALUES (1001400,3328)
/* interrupt */
INSERT INTO [Entries] VALUES (1003000,2768)
/* change */
INSERT INTO [Entries] VALUES (1003001,3328)
INSERT INTO [Entries] VALUES (1003002,3328)
INSERT INTO [Entries] VALUES (1003003,3328)
GO
Create two views, one of them giving all the records that act as the initial of a group and another view for the finals.
A record is an initial/final record if the previous/next enNumber does not exist (an interrupt) or has different values (a change).
CREATE VIEW [Initials] AS
SELECT E.enNumber
FROM Entries E
LEFT JOIN Entries E2 on E2.enNumber = E.enNumber - 1
AND E2.enProduct= E.enProduct
WHERE E2.enNumber IS NULL
GO
CREATE VIEW [Finals] AS
SELECT E.enNumber
FROM Entries E
LEFT JOIN Entries E2 on E2.enNumber = E.enNumber + 1
AND E2.enProduct= E.enProduct
WHERE E2.enNumber IS NULL
GO
Each record in Initials has a counterpart in Finals with an enNumber equal or greater than its enNumber.
SELECT i.enNumber AS Initial, E.enProduct
FROM Initials i
LEFT JOIN Entries E ON E.enNumber = i.enNumber
SELECT f.enNumber AS Final, E.enProduct
FROM Finals f
LEFT JOIN Entries E ON E.enNumber = f.enNumber
Initial enProduct
1000309 2768
1001388 3328
1001393 3743
1001397 3328
1003000 2768
1003001 3328
Final enProduct
1000317 2768
1001392 3328
1001396 3743
1001400 3328
1003000 2768
1003003 3328
You can combine these two views in different ways to achieve the desired results:
SELECT i.enNumber AS initial, MIN(f.enNumber) AS final, E.enProduct
FROM Initials i
LEFT JOIN finals f ON f.enNumber >= i.enNumber
LEFT JOIN Entries E ON E.enNumber = i.enNumber
GROUP BY i.enNumber, E.enProduct
ORDER BY i.enNumber
initial final enProduct
1000309 1000317 2768
1001388 1001392 3328
1001393 1001396 3743
1001397 1001400 3328
1003000 1003000 2768
1003001 1003003 3328

Answer 2

I think you need to do this with subquery. In the subquery, you will get the min and max values and include the columns you want to sort by. In the main query, you will select all columns. See the following link for details:
http://www.xaprb.com/blog/2006/12/07/how-to-select-the-firstleastmax-row-per-group-in-sql/
Section "Selecting the one maximum row from each group"

Answer 3

I've wrote a query and got the results i was trying to find. I still don't like it very much as i think it will have a big cost on the database to run it, and i'd like to find one simpler. But anyway, the "problem" it self is resolved.
The resulting query is writen as follows:
SELECT
[Pre].[pfPrefix],
[Pro].[prId],
[Pro].[prName],
(CASE
WHEN [EnP].[enNumber] IS NULL THEN [EnT].[enNumber]
ELSE
(SELECT TOP 1
[iET].[enNumber]
FROM
[SerialsDB].[dbo].[Entries] AS [iET]
LEFT OUTER JOIN [SerialsDB].[dbo].[Entries] AS [iEP]
ON (([iEP].[enProduct] IS NULL AND [iET].[enProduct] IS NULL) OR
([iEP].[enProduct] = [iET].[enProduct])) AND
(([iEP].[enOrder] IS NULL AND [iET].[enOrder] IS NULL) OR
([iEP].[enOrder] = [iET].[enOrder])) AND
(([iEP].[enClient] IS NULL AND [iET].[enClient] IS NULL) OR
([iEP].[enClient] = [iET].[enClient])) AND
(([iEP].[enNfe] IS NULL AND [iET].[enNfe] IS NULL) OR
([iEP].[enNfe] = [iET].[enNfe])) AND
(([iEP].[enDate] IS NULL AND [iET].[enDate] IS NULL) OR
([iEP].[enDate] = [iET].[enDate])) AND
(([iEP].[enAuth] IS NULL AND [iET].[enAuth] IS NULL) OR
([iEP].[enAuth] = [iET].[enAuth])) AND
(([iEP].[enStatus] IS NULL AND [iET].[enStatus] IS NULL) OR
([iEP].[enStatus] = [iET].[enStatus])) AND
([iEP].[enNumber] = ([iET].[enNumber] - 1))
WHERE
(([iET].[enProduct] IS NULL AND [EnT].[enProduct] IS NULL) OR
([iET].[enProduct] = [EnT].[enProduct])) AND
(([iET].[enOrder] IS NULL AND [EnT].[enOrder] IS NULL) OR
([iET].[enOrder] = [EnT].[enOrder])) AND
(([iET].[enDate] IS NULL AND [EnT].[enDate] IS NULL) OR
([iET].[enDate] = [EnT].[enDate])) AND
(([iET].[enClient] IS NULL AND [EnT].[enClient] IS NULL) OR
([iET].[enClient] = [EnT].[enClient])) AND
(([iET].[enNfe] IS NULL AND [EnT].[enNfe] IS NULL) OR
([iET].[enNfe] = [EnT].[enNfe])) AND
(([iET].[enAuth] IS NULL AND [EnT].[enAuth] IS NULL) OR
([iET].[enAuth] = [EnT].[enAuth])) AND
(([iET].[enStatus] IS NULL AND [EnT].[enStatus] IS NULL) OR
([iET].[enStatus] = [EnT].[enStatus])) AND
([iET].[enNumber] <= [EnP].[enNumber]) AND
([iEP].[enNumber] IS NULL)
ORDER BY
[iET].[enNumber] DESC)
END) AS [Initial],
[EnT].[enNumber] AS [Final],
[EnT].[enOrder],
[EnT].[enDate],
[EnT].[enNfe],
[EnT].[enClient],
[Cli].[clGroup],
[EnT].[enAuth]
FROM
[SerialsDB].[dbo].Entries AS [EnT]
LEFT OUTER JOIN [SerialsDB].[dbo].[Entries] AS [EnN]
ON ([EnN].[enProduct] = [EnT].[enProduct]) AND
([EnN].[enOrder] = [EnT].[enOrder]) AND
([EnN].[enClient] = [EnT].[enClient]) AND
(([EnN].[enNfe] IS NULL AND [EnT].[enNfe] IS NULL) OR
([EnN].[enNfe] = [EnT].[enNfe])) AND
([EnN].[enDate] = [EnT].[enDate]) AND
([EnN].[enStatus] = [EnT].[enStatus]) AND
([EnN].[enAuth] = [EnT].[enAuth]) AND
([EnN].[enNumber] = ([EnT].[enNumber] + 1))
LEFT OUTER JOIN [SerialsDB].[dbo].[Entries] AS [EnP]
ON ([EnP].[enProduct] = [EnT].[enProduct]) AND
([EnP].[enOrder] = [EnT].[enOrder]) AND
([EnP].[enClient] = [EnT].[enClient]) AND
(([EnP].[enNfe] IS NULL AND [EnT].[enNfe] IS NULL) OR
([EnP].[enNfe] = [EnT].[enNfe])) AND
([EnP].[enDate] = [EnT].[enDate]) AND
([EnP].[enStatus] = [EnT].[enStatus]) AND
([EnP].[enAuth] = [EnT].[enAuth]) AND
([EnP].[enNumber] = ([EnT].[enNumber] - 1))
LEFT OUTER JOIN [SerialsDB].[dbo].[Prefixes] AS [Pre]
ON ([EnT].[enPrefix] = [Pre].[pfId])
LEFT OUTER JOIN [SerialsDB].[dbo].[Products] AS [Pro]
ON ([EnT].[enProduct] = [Pro].[prId])
LEFT OUTER JOIN [SerialsDB].[dbo].[Clients] AS [Cli]
ON ([EnT].[enClient] = [Cli].[clId])
WHERE
([EnT].[enOrder] IS NOT NULL) AND
([EnT].[enClient] IS NOT NULL) AND
([EnN].[enNumber] IS NULL) AND
([EnT].[enStatus] = 4) AND
([EnT].[enAuth] IS NOT NULL)
Thank you Amir for the great inputs, and for Stamen for the suggestion.