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How long it takes to learn pl sql?


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More SQL PLSQL Interview Questions

Can we want to pass a parameter payroll_id to this external pl/sql function, how do we do it?

0 Answers  


What found sql?

0 Answers  


What are the two characteristics of a primary key?

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take one table is t1 and in that column name is f1 f1 column values are 200 5000 3000 7000 300 600 100 400 800 400 i want display the values asc and desc in a single output. sample output is f1.a 100 200 300 400 500 600 etc...... and f1.d is 5000 4000 3000 2000 1000 etc...

9 Answers   Zensar,


How does pl sql work?

0 Answers  


write the Sql query for creating database backup?

7 Answers   TCS,


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  


Which is faster subquery or join?

0 Answers  


explain the delete statements in sql

0 Answers  


What are the advantages of the packages

6 Answers   Oracle,


What is the command used to fetch first 5 characters of the string?

0 Answers  


What is the difference between functions, procedures, and packages in pl/sql?

0 Answers  


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