Answer / neha

In the in clause, the inner query is executed first, hence if the inner query return less data than the outer query, then use IN clause, in the other scenario, user exists clause.

Also, in the exists clause the inner query always reference outer query's table, which may or may not be the case with in IN clause.

Answer / rashmi

> we use IN gives better performance when there is less number of record in a table (up to 999 records), But for large number records EXIST give better performance.
>In may or may not depends a sub query all time, But EXIST always depend on a sub query.

Answer / manoranjan sethy

Exist operator always faster then In operator.
because assume that we gave value like in(10) then what is does? it will search my entire table and wherever 10 is found it will return as output.
but in exist operator if 10 found then optimizer will stop the searching process that is how exist gives more performance.

ii) In operator all ways conduct pattern search process but exist conduction boolean state of search process.

How do I get sql certification?

0 Answers  

---

Is big data nosql?

0 Answers  

---

How do you delete duplicates in sql query using rowid?

0 Answers  

---

What are the indexing methods?

0 Answers  

---

What are analytical functions in sql?

0 Answers  

---

what is the difference between where clause and having clause? : Sql dba

0 Answers  

---

What is oracle pl sql developer?

0 Answers  

---

What is difference between hql and sql?

0 Answers  

---

What is the difference between the repeatable read and serializable isolation levels? : Transact sql

0 Answers  

---

I have 2 table A and B. In A 1 lakh record is present. In b 20 thousand data is present. To get the unique data from table A and B which join we should prefer left inner join or right outer join. Please answer.

4 Answers   GE,

---

What is a null value?

0 Answers  

---

What are the blocks in stored procedure?

6 Answers   Microsoft,

---