Fetch single data from table in sql? - sql

Question

I have three tables in my SQL Server
1.) Registration it's columns
Reg_Id bigint, primary key and auto increment
Name nvarchar(50),
Tranx_id nvarchar(30),
Email nvarchar(30),
Username nvarchar(30),
Password nvarchar(30),
Edition_Id nvarchar(50),
Default_Id nvarchar(50),
Reg_Date datetime,
usertype nvarchar(50),
2.) AllEditionPages it's columns
Page_id bigint, primary key and auto increment
edition_date datetime,
noofpages int,
Page_no int,
image_path nvarchar(50),
Active int,
type_of_page varchar(50),
Image_Width int,
Image_Height int,
3.) Edition
id int, primary key and auto increment
edition_date datetime,
noofpages int,
XMLFile nvarchar(50),
PDFFile nvarchar(50),
PDFPrefix nvarchar(50),
type nvarchar(50),
price nvarchar(50),
reg_req nvarchar(50)
As per above table I try below sql query
SELECT edi.*, aep.*, reg.*
FROM Edition as edi INNER JOIN Registration as reg
ON edi.id = reg.Edition_Id INNER JOIN AllEditionPages as aep
ON edi.edition_date = aep.edition_date
where reg.Edition_Id= edi.id
and reg.Reg_ID = 14
From this query I get this output:
id edition_date type price page-id
96 2012-07-18 00:00:00.000 free null 2503
96 2012-07-18 00:00:00.000 free null 2503
I get in output two rows, but want only single row in output

Answer 1

You can use common table expression in this scenario in following way:
WITH cteTable AS
(
SELECT edi.*, aep.*, reg.*
FROM Edition as edi INNER JOIN Registration as reg
ON edi.id = reg.Edition_Id INNER JOIN AllEditionPages as aep
ON edi.edition_date = aep.edition_date
where reg.Edition_Id= edi.id
and reg.Reg_ID = 14
)
select top 1 * from cteTable
As you two table contains edition_date, you need to spcify the column name instead of using "*" in following way:
WITH cteTable AS
(
SELECT edi.id,edi.edition_date,edi.noofpagez,edi.XMLFile,edi.PDFFile ,edi.PDFPrefix,edi.type,edi.price,edi.reg_req ,
aep.Page_id, aep.edition_date,aep.noofpages,aep.Page_no,aep.image_path,aep.Active,aep.type_of_page,aep.Image_Width,aep.Image_Height,
reg.Reg_Id,reg.Name,reg.Tranx_id,reg.Email,reg.Username,reg.Password,reg.Edition_Id,reg.Default_Id,reg.Reg_Date,reg.usertype
FROM Edition as edi INNER JOIN Registration as reg
ON edi.id = reg.Edition_Id INNER JOIN AllEditionPages as aep
ON edi.edition_date = aep.edition_date
where reg.Edition_Id= edi.id
and reg.Reg_ID = 14
)
select top 1 * from cteTable

Answer 2

You have to specify one row.From your putput it looks like you have duplicate data and if that is the issue you should use distinct to get distinct rows..Otherwise specify what exactly you need.

Answer 3

You can use select distinct if the 2 rows have the same value, or you can simple use LIMIT 0,1 behind your query.