create table table1(Id int, Name varchar(10))

create table table2(Id int)

insert into table1 values(101, ‘Test’)
insert into table2 values(101)
insert into table2 values(101)
insert into table2 values(101)

SELECT * FROM (SELECT DISTINCT [Table1].* , ROW_NUMBER() OVER (ORDER BY [Table1].Name) AS RowNumber
FROM [Table1]
LEFT JOIN [Table2] ON [Table1].Id = [Table2].Id) AS TempTable

SELECT * FROM (SELECT DISTINCT [Table1].* , ROW_NUMBER() OVER (ORDER BY [Table1].Name) AS RowNumber
FROM [Table1]
LEFT JOIN [Table2] ON [Table1].Id = [Table2].Id) AS TempTable
WHERE RowNumber BETWEEN 1 AND 10

I used Left outer join in my SQL query and the execution time was 6 min and for the same query when I removed the “Outer”, the processing time was only 3 min.

2) select CASE
WHEN
(
b.col2 = ‘Y’
)
then ‘Y’ else ‘N’
from TABLE_A a left join (sel col1,col2 from TABLE_B) b on a.col1=b.col1 ;

Theta join is a join in relational algebra. It’s a join where the join operator can be other than =

http://blog.sqlauthority.com/2010/11/28/sql-server-challenge-puzzle-why-does-right-join-exists/

Why do we have Right Outer Join when we have Left Outer Join. We can swap the tables and get the desired result. Please can you throw some light on this.

Regards,
Uday

Please explain how to handle null values on a column that is being used to join 2 tables?

Thanks,
Amit

One of my interview i got qns what is theta join.i read your
previous blog.i didn’t find about theta join.
could you please tell us something about theta join?