Why do we need view in sql?

0 Answers  

---

What is data type in database?

0 Answers  

---

Store procedure will return a value?

4 Answers   eMids,

---

Explain the usage of WHERE CURRENT OF clause in cursors ?

3 Answers  

---

What are the benefits of triggers?

0 Answers  

---

---

How is a process of pl/sql compiled?

0 Answers  

---

how many groups of data types? : Sql dba

0 Answers  

---

What is a primary key example?

0 Answers  

---

When a dml statement is executed, in which cursor attributes, the outcome of the statement is saved?

0 Answers  

---

What is Temp Table and type of temp table?

1 Answers   HP, SLK,

---

how to check the 3rd max salary from an employee table? One of the queries used is as follows: select sal from emp a where 3=(select count(distinct(sal)) from emp b where a.sal<=b.sal). Here in the sub query "select count(distinct(sal)) from emp b where a.sal<=b.sal" or "select count(distinct(sal)) from emp b where a.sal=b.sal" should reveal the same number of rows is in't it? Can any one here please explain me how is this query working perfectly. However, there is another query to get the 3rd highest of salaries of employees that logic I can understand. Pls find the query below. "select min(salary) from emp where salary in(select distinct top 3 salary from emp order by salary desc)" Please explain me how "select sal from emp a where 3=(select count(distinct(sal)) from emp b where a.sal<=b.sal)" works source:http://www.allinterview.com/showanswers/33264.html. Thanks in advance Regards, Karthik.

4 Answers  

---

What is pl/sql tables?

7 Answers   TCS,

---