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Complex SQL Written Questions for Data Engineer

1.We need to populate male and female alternatively
For Example:




Above records need to Populate as below:



Ans:


2.Find all the students whose marks greater than the average marks in each subject within a class
For Example:



Expected Output:

Output:

3.    Find the data given below, and display the data with cumulative values

CREATE TABLE MONTHLYVOLUME
  (YEAR NUMBER(4),
  MONTH CHAR(3),
  SALES NUMBER(3));
/

INSERT INTO MONTHLYVOLUME VALUES (2007,'JAN',11);
INSERT INTO MONTHLYVOLUME VALUES (2007,'FEB',9);
INSERT INTO MONTHLYVOLUME VALUES (2007,'MAR',7);
INSERT INTO MONTHLYVOLUME VALUES (2007,'APR',5);
INSERT INTO MONTHLYVOLUME VALUES (2007,'MAY',14);
INSERT INTO MONTHLYVOLUME VALUES (2007,'JUN',6);
INSERT INTO MONTHLYVOLUME VALUES (2007,'JUL',8);
INSERT INTO MONTHLYVOLUME VALUES (2007,'AUG',17);
INSERT INTO MONTHLYVOLUME VALUES (2007,'SEP',18);
INSERT INTO MONTHLYVOLUME VALUES (2007,'OCT',19);
INSERT INTO MONTHLYVOLUME VALUES (2007,'NOV',12);
INSERT INTO MONTHLYVOLUME VALUES (2007,'DEC',1);
INSERT INTO MONTHLYVOLUME VALUES (2008,'JAN',4);
INSERT INTO MONTHLYVOLUME VALUES (2008,'FEB',7);
INSERT INTO MONTHLYVOLUME VALUES (2008,'MAR',8);
INSERT INTO MONTHLYVOLUME VALUES (2008,'APR',21);
INSERT INTO MONTHLYVOLUME VALUES (2008,'MAY',23);
INSERT INTO MONTHLYVOLUME VALUES (2008,'JUN',24);
INSERT INTO MONTHLYVOLUME VALUES (2008,'JUL',17);
INSERT INTO MONTHLYVOLUME VALUES (2008,'AUG',18);
INSERT INTO MONTHLYVOLUME VALUES (2008,'SEP',15);
INSERT INTO MONTHLYVOLUME VALUES (2008,'OCT',13);
INSERT INTO MONTHLYVOLUME VALUES (2008,'NOV',15);
INSERT INTO MONTHLYVOLUME VALUES (2008,'DEC',16);
INSERT INTO MONTHLYVOLUME VALUES (2009,'JAN',4);
INSERT INTO MONTHLYVOLUME VALUES (2009,'FEB',5);
INSERT INTO MONTHLYVOLUME VALUES (2009,'MAR',8);
INSERT INTO MONTHLYVOLUME VALUES (2009,'APR',1);
INSERT INTO MONTHLYVOLUME VALUES (2009,'MAY',3);
INSERT INTO MONTHLYVOLUME VALUES (2009,'JUN',2);
INSERT INTO MONTHLYVOLUME VALUES (2009,'JUL',7);
INSERT INTO MONTHLYVOLUME VALUES (2009,'AUG',8);
INSERT INTO MONTHLYVOLUME VALUES (2009,'SEP',5);
INSERT INTO MONTHLYVOLUME VALUES (2009,'OCT',3);
INSERT INTO MONTHLYVOLUME VALUES (2009,'NOV',1);
INSERT INTO MONTHLYVOLUME VALUES (2009,'DEC',6);
INSERT INTO MONTHLYVOLUME VALUES (2010,'JAN',4);
INSERT INTO MONTHLYVOLUME VALUES (2010,'FEB',17);
INSERT INTO MONTHLYVOLUME VALUES (2010,'MAR',8);
INSERT INTO MONTHLYVOLUME VALUES (2010,'APR',2);
INSERT INTO MONTHLYVOLUME VALUES (2010,'MAY',2);
INSERT INTO MONTHLYVOLUME VALUES (2010,'JUN',4);
INSERT INTO MONTHLYVOLUME VALUES (2010,'JUL',7);
INSERT INTO MONTHLYVOLUME VALUES (2010,'AUG',8);
INSERT INTO MONTHLYVOLUME VALUES (2010,'SEP',25);
INSERT INTO MONTHLYVOLUME VALUES (2010,'OCT',13);
INSERT INTO MONTHLYVOLUME VALUES (2010,'NOV',19);
INSERT INTO MONTHLYVOLUME VALUES (2010,'DEC',18);

Expected Output:

Actual Output:

3.Find all the students who enrol for all the courses in the particular year
For Example:

Expected Output:

Actual Output:
4.Find out the top 3 highest sold products
For Example:


Expected Output:

Actual Output:
5.Based on the call logs find out the customer whose first call and last call is same person within a day
For Example:

Expected Output:

Actual Output:

6.Find out all the sales representative who involves in sales of subsequent day as well
For Example:


Expected Output:

Actual Output:
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