Microsoft SQL server does not support a method of identifying the row numbers for records stored on disk, although there are a number of different techniques to associate a sequential number with a row. Today, we'll cover how you can number records by having an identity column, using a temporary table, altering tables, using Self Join, usiung a cursor, and numbering groups of records. See the full tutorial
here.
Sequentially Numbering Records by Having an Identity Column
SET NOCOUNT ON
CREATE TABLE SEQ_NUMBER_EXAMPLE
(
RECORD_NUMBER INT IDENTITY (1,1),
DESCRIPTION VARCHAR(40))
INSERT INTO SEQ_NUMBER_EXAMPLE VALUES('FIRST RECORD')
INSERT INTO SEQ_NUMBER_EXAMPLE VALUES('SECOND RECORD')
INSERT INTO SEQ_NUMBER_EXAMPLE VALUES('THIRD RECORD')
INSERT INTO SEQ_NUMBER_EXAMPLE VALUES('FOURTH RECORD')
INSERT INTO SEQ_NUMBER_EXAMPLE VALUES('FIFTH RECORD')
SELECT * FROM SEQ_NUMBER_EXAMPLE
DROP TABLE SEQ_NUMBER_EXAMPLE
Sequentially Numbering Records by Using a Temporary Table
create table
#HireDate (rank int identity,
HireDate datetime,
LastName nvarchar(20),
FirstName nvarchar(20)
)
insert into #HireDate (HireDate, LastName, FirstName)
select Hiredate, LastName, Firstname
from northwind.dbo.employees
where Title = 'Sales Representative'
order by HireDate
Select cast(rank as char(4)) as Rank,
cast(hiredate as varchar(23)) as HireDate,
LastName,
FirstName from #HireDate
Drop table #HireDate
Sequentially Numbering Records by Altering Table
set nocount on
alter table pubs
.dbo.titles
add rownum int identity(1,1)
go
select rownum, title from pubs.dbo.titles
where rownum < 6
order by rownum
go
alter table pubs.dbo.titles
drop column rownum
Sequentially Numbering Records by Using a Self Join
SELECT count
(*) RecNum,
a.LastName
FROM Northwind.dbo.Employees a join
Northwind.dbo.Employees b
on a.LastName >= b.LastName
group by a.LastName
order by a.LastName
Sequentially Number Records by Using a Cursor
declare
@i int
declare @name varchar(200)
declare authors_cursor cursor
for select rtrim(au_lname) + ', ' + rtrim(au_fname) from pubs.dbo.authors
where au_lname < 'G'
order by au_lname, au_fname
open authors_cursor
fetch next from authors_cursor into @name
set @i = 0
print 'recnum name'
print '------ -------------------------------'
while @@fetch_status = 0
begin
set @i = @i + 1
print cast(@i as char(7)) + rtrim(@name)
fetch next from authors_cursor into @name
end
close authors_cursor
deallocate authors_cursor
Sequentially Numbering Groups of Records
select OD
.OrderID, LineNumber, OD.ProductID, UnitPrice, Quantity, Discount
from Northwind.dbo.[Order Details] OD
join
(select count(*) LineNumber,
a.OrderID, a.ProductID
from Northwind.dbo.[Order Details] A join
Northwind.dbo.[Order Details] B
on A.ProductID >= B.ProductID
and A.OrderID = B.OrderID
group by A.OrderID, A.ProductID) N
on OD.OrderID= N.OrderID and
OD.ProductID = N.ProductID
where OD.OrderID < 10251
order by OD.OrderID, OD.ProductID
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