Can we join two tables without common column?

0 Answers  

---

What is count * in sql?

0 Answers  

---

How to load data with sql*loader?

0 Answers  

---

why does the selected column have to be in the group by clause or part of an aggregate function? : Sql dba

0 Answers  

---

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  

---

---

explain advantages of innodb over myisam. : Sql dba

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 explain plan?, given an example...

3 Answers   Polaris,

---

What are string functions in sql?

0 Answers  

---

What is clustered index in sql?

0 Answers  

---

How many types of triggers are there in pl sql?

0 Answers  

---

Explain the usage of WHERE CURRENT OF clause in cursors ?

3 Answers  

---