Some basic SQL queries which should be practiced before going to Interview - Part 1

Amatya
Posted by in Sql Server category on for Beginner level | Points: 250 | Views : 730 red flag

Some SQL Server queries which you should prepare before going to your
interview. Basically while going to C#, ASP .Net interview SQL Server interview is common. So be prepare for SQL server
queries.

Introduction

Some basic SQL queries which should be practiced before going to Interview - Part 1

Describe the topic with code snippets

Hi guys, in this article I will talk about some SQL Server queries which you should prepare before going to your
interview. Basically while going to C#, ASP .Net interview SQL Server interview is common. So be prepare for SQL server 
queries. Here we go- 

1) Get employee details from tblEmp table whose employee name is "Amatya"

Select * from tblEmp where F_Name='Amatya'

2)Get employee details from tblEmp table whose employee name are "Amatya" and "Aditya"

Select * from tblEmp where F_Name in ('Amatya','Aditya')

3)Get employee details from tblEmp table whose employee name are not "Amatya" and "Aditya"

Select * from tblEmp where F_Name not in ('Amatya','Aditya')

4)  Get employee details from tblEmp table whose first name ends with 'u'

Select * from tblEmp where FIRST_NAME like '%u'

5)  Get employee details from tblEmp table whose salary is greater than 500000

Select * from tblEmp where Sal >500000

6) Count of number of employees in  department  wise.

select count(EMPNO), b.deptno, dname from tblEmp a, tbldept b  where a.deptno=b.deptno  group by b.deptno,dname;

7) Get unique department from tblEmp table

select distinct department from EMPLOYEE

8) How to delete duplicate rows in a table?

Delete from tblEmp a where rowid != (select max(rowid) from emp b where  a.empno=b.empno);

9)   Get employee details from tblEmp table whose joining year is “2017”

 
  Select * from tblEmp where SUBSTRING(convert(varchar,Work_Date,103),7,4)='2017'

10)  The || (double pipe) symbol concatenates two strings. 

 
SELECT F_Name || L_Name FullName
                              FROM tblEmp;
10 a)  Two column concatenated with comma seperate
                              SELECT L_Name || ',' || F_Name NAME
                                FROM tblEmp;
Hope it will help you guys in your preparation.






Conclusion

As soon as possible I will deliver more part of SQL Server queries to you all guys
All the Best. Stay blessed.
 Your opinion and suggestion are welcome.

Reference

From my notebook and learning experience

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About the Author

Amatya
Full Name: Amatya Agyey
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Member Since: 5/9/2015 12:56:12 AM
Country: India
Feel free to share informations 9731764134 mail Id ' adityagupta200@gmail.com Thanks
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