Skip to main content

Questions on BASIC SELECT Statement



SELECT *|{[DISTINCT] column|expression [alias],...}
FROM table;

1. Display all rows and all columns of emp table
2. Display any 2 columns of emp table
3. Calculate annual salary with Quarterly commission of 500
4. Display distinct salaries of all the employees
5. Display output as following,
      "Hello SMITH your salary is 5000"
6. Is the following statement correct,
       SeleCT ENAME,deptno FROM emp;
       select *,ename from emp;
       select ename deptno from emp;


Namrata Yadav said…
Hi Mithun,

Answers for the Basic SQL stmt are not available. Please recheck and post the same.

Thnaking you
Ysreehari10 said…
i can not find questions on joins concept
Mithun Ashok said…
Yes they are missing. Will share the link in a short while.
Thaman 1025 said…
Shubhi Patil said…
Hie,do you have any SQL queries bit logical ones usually asked in Interviews?
Unknown said…
Guys we can use this query for 5th max salary:

Select Min(salary) as 5thsalary From (Select Top 5 salary From Employee Order by salary Desc);

Thanking You,

Unknown said…
i dint get te answer it says from keyword not found where expected :(
Unknown said…
thank u mithun ashok sir ur tutorial is vvvv helpful to me n nw im gonna pass this link to many of my frnds
ppl teach only basic sql n tey dont evene try to concentrate on different types of questions being asked ur tutorial has really improvised my sql skill a lot

Unknown said…
unable to see database schema..????

Popular posts from this blog

SQL Interview Questions on Subqueries

SUB Queries:
1. List the employees working in research department 2. List employees who are located in New York and Chicago
3. Display the department name in which ANALYSTS are working
4. Display employees who are reporting to JONES
5. Display all the employees who are reporting to Jones Manager
6. Display all the managers in SALES and ACCOUNTING department
7. Display all the employee names in Research and Sales Department who are having at least 1 person reporting to them
8. Display all employees who do not have any reportees
9. List employees who are having at least 2 reporting
10. List the department names which are having more than 5 employees
11. List department name having at-least 3 salesman
12. List employees from research and accounting having at-least 2 reporting
13. Display second max salary
14. Display 4th max salary
15. Display 5th max salary  -- Answer for nth Max Salary
Co-Related Subqueries:
16. Write a query to get 4th max salary from EMP table
17. Write a query to get 2nd…

'Linux-x86_64 Error: 28: No space left on device' While trying to start the database -- Error

SQL> startup mount pfile='/tmp/initdlfasp12.ora'
ORA-27102: out of memory
Linux-x86_64 Error: 28: No space left on device

This as you can see is on Linux x86 with 64 bit processor. We got this error after we changed SGA on 10gR2 database. So was sure that this is something to do with the OS.

Parameters to check for this are shmall.

shmall is the total amount of shared memory, in pages, that the system can use at one time.

$cat /proc/sys/kernel/shmmax

$ getconf PAGE_SIZE

As per Oracle SHMALL should be set to the total amount of physical RAM divided by page size.

Our system has 64GB memory, so change kernel.shmall = 1024 * 1024 * 1024 * 64 / 4096 = 16777216

Once this value is calculated you can modify Linux system configuration file directly.

$ su - root
vi /etc/sysctl.conf file:


# sysctl -p

Once this is done the database was started without any problem.

Answers for SQL Functions

1. SQL> SELECT empno, ename FROM emp WHERE Length(ename) = 4;

2. SQL> SELECT empno, ename, job FROM emp where Length(job)=7;

3. SQL> SELECT Length('qspiders') - Length(replace('qspiders','s','')) FROM dual;

4. SQL>  SELECT empno, ename, job FROM emp WHERE Instr(job,'MAN') >0;

5. SQL> SELECT empno, ename, job FROM emp WHERE Instr(job, 'MAN') =1;

6. SQL> SELECT empno, ename, job FROM emp WHERE (Length(ename) - Length(Replace(ename, 'L',''))) = 1;

7. SQL> SELECT * FROM dept WHERE Instr(dname,'O') > 0;

8. SQL> SELECT Concat(ename,' working as a ') || Concat(job, ' earns ') || Concat(sal, '  in ') || Conc
at('dept ',deptno) AS text from emp;


SQL> SELECT Concat(Concat(Concat(Concat(Concat(Concat(Concat(ename,' working as a '), job),' earns '), sal),'  in '),'dept '), deptno) AS text FROM emp;

9. SQL> SELECT empno, ename…