Answer / monal

HERE'S THE SIMPLE ANSWER:
WHEN YOU USE 'IN', WHILE CHECKING FOR WHERE CONDITION SQL
SERVER ENGINE DOES WHOLE TABLE SCAN.
IF YOU USE 'EXISTS' AS SOON AS ENGINE FINDS THE REQUIRED
ROW IT WILL STOP EXECUTING QUERY AND GOING FURTHER SCANNING
TABLE.

SO BASICALLY EXISTS IS FASTER AS COMPARED TO IN.

Answer / vijaykumar dolli

using the IN clause, you're telling the rule-based
optimizer that you want the inner query to drive the outer
query (think: IN = inside to outside).

When you write EXISTS in a where clause, you're telling the
optimizer that you want the outer query to be run first,
using each value to fetch a value from the inner query
(think: EXISTS = outside to inside).

Thank you

Answer / pranab

IN:

Returns true if a specified value matches any value in a
sub-query or a list.

Exists:

Returns true if a sub-query contains any rows.

Answer / navneet sharma

IN work like a OR in sql query but in is faster than OR in
case of IN server will search whole table
EXISTS is use to find the required row and does not search
whole table

Answer / arslan

the basic difference between in and exists

let's take the example of for loop in c++ and in loops when you write break statement it will iterates until the condition of break statement will true this like exist and in
if you didn't put break in it then it will execute the whole loop

Answer / raja

in operator returns the condition satisfied rows only

But in exists operator if any condition satisfied it will returns all the rows.

Answer / s. raban

see my answers

Answer / x

No Difference

Answer / santhosh

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