group by with joins in sql server

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Hi,
i am working with sql server. now i want to join two tables like below.

SQL

select 
bill.bill_no as BillNo,
bill.customer_name,
room_no_info.room_number,
isnull(convert(varchar(11),room_no_info.in_date,106),'01-Jan-99') as InDate,
isnull(convert(varchar(11),room_no_info.out_date,106),'01-Jan-99') as OutDate
 from bill inner join room_no_info on bill.bill_no=room_no_info.bill_no group by bill.bill_no,room_no_info.room_number,room_no_info.in_date,room_no_info.out_date,
bill.customer_name

it returns like below..

BillNo Name RoomNo InDate OutDate

20 Name:zzzz 315 02 Jun 2013 14 Jun 2013
21 Name:xxxx 309 02 Jun 2013 15 Jun 2013
21 Name:xxxx 310 02 Jun 2013 03 Jun 2013
22 Name:yyyy 206 01 Jun 2013 02 Jun 2013

it returns all rows which are satisfies join conditions but i want return only one row from the second table.

can u help me any one?

Posted 4-Aug-13 20:56pm

Balasubramanian T

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Maciej Los · Answer 1 · 2013-08-04T21:00:00

Solution 1

Instead INNER JOIN, use RIGHT or LEFT JOIN.
To understand the difference, please, read this article: Visual Representation of SQL Joins[^]

Posted 4-Aug-13 21:00pm

Maciej Los

Balasubramanian T · Answer 2 · 2013-08-05T01:44:00

i solved using aggregate function.

SQL

select
bill.bill_no as BillNo,
bill.customer_name,
max(room_no_info.room_number),
isnull(convert(varchar(11),room_no_info.in_date,106),'01-Jan-99') as InDate,
isnull(convert(varchar(11),room_no_info.out_date,106),'01-Jan-99') as OutDate
 from bill inner join room_no_info on bill.bill_no=room_no_info.bill_no group by bill.bill_no,room_no_info.in_date,room_no_info.out_date,
bill.customer_name