MySQL Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

MySQL Interview Questions

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Hi Team, This is kartik, I recently completed my B-tech. Importance of posting this question is for to know the best books on SQL(MYSQL/Oracle)? I like SQL concept's so much, at the same time i decided to choose SQL for my career purpose. So please suggest me the best books that are very helpful for a fresher to improve concepts like (SQL/PLSQL)Basics, programming concepts, architectures etc. Please consider my request as an important one. I am very thankful to you for providing this opportunity. If possible can you please send the names of books for my personal id also: karthikgdv1206@yahoo.com. Thanks, Kartik T

2189

how to find 2nd highest salary in random database salary of employer.....

4 7147

why we are join a tow table

1 3230

I have a table like this tblData (month int,Qty int) and i am inserting three rows in this table 1.tblData Values (1,100) 2.tblData Values (2,200) 3.tblData Values (3,300) The Result I want is the Running total of the field Qty that is 1 100 100 2 200 300 3 300 600 What is the Query for that ?

4 6489

mysql> select * from store; +------+-------+-------+ | id | month | sales | +------+-------+-------+ | 1 | 1 | 100 | | 1 | 2 | 100 | | 1 | 3 | 200 | | 1 | 4 | 300 | | 1 | 5 | NULL | | 1 | 6 | 200 | | 1 | 7 | 800 | | 1 | 8 | 100 | | 1 | 9 | 240 | | 1 | 10 | 140 | | 1 | 11 | 400 | | 1 | 12 | 300 | | 2 | 1 | 300 | | 2 | 2 | 300 | | 2 | 3 | 300 | | 2 | 4 | 200 | | 2 | 5 | 200 | | 2 | 6 | 200 | | 2 | 7 | 100 | | 2 | 8 | 100 | | 2 | 9 | 300 | | 2 | 10 | 100 | | 2 | 11 | 150 | | 2 | 12 | 150 | +------+-------+-------+ this is my table. i need to display output like this. +------+----------+----------+----------+----------+ | id | quarter1 | quarter2 | quarter3 | quarter4 | +------+----------+----------+----------+----------+ | 1 | 400 | 500 | 1140 | 840 | | 2 | 900 | 600 | 500 | 400 | +------+----------+----------+----------+----------+ what single query i have to write for this. i tried this query and it displays like the below mysql> select id,sum(sales) as quarter1,(select sum(sales) from store where mont h>3 and month<7 ) as quarter2,(select sum(sales) from store where month>6 and mo nth<10)as quarter3 from store where month>0 and month<4 group by id; +------+----------+----------+----------+ | id | quarter1 | quarter2 | quarter3 | +------+----------+----------+----------+ | 1 | 400 | 1100 | 1640 | | 2 | 900 | 1100 | 1640 | +------+----------+----------+----------+ 2 rows in set (0.00 sec) tel me how to rectify it.

2 4452

how to know the tables in database having foreign key?

2 4401

Difference between MYSQL_ASSOC,MYSQL_NUM and MYSQL_BOTH ?

TCS,

3 21945

using primary can we relate two table, with out foreign key?

2666

what is the size of date datatype in sql?

2 5075

What is the diff. bwt. primary key and unique key?

4 6184

What is the use of indexing table?

2 6267

what is the difference between MyIsam and InnoDb engine?

2 6479

how fastest access of data can be done from database ?

3 5254

what is the querry for all managers salary?

2 4195

how to find max salary from the database

3 5828

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Un-Answered Questions { MySQL }

What is mvcc in mysql?

931

Please can the SQL code below be interpreted IF @xMatchCriteria='MATCH12' BEGIN IF EXISTS (Select * from #InsightData where (EmailAddress=@xDCPEmailAddress ) ) BEGIN SET @xTestMatchCriteria = @xMatchCriteria; SELECT @xCRMCustomerId=CustomerId, @xCRMDcpCustomerId=DcpCustomerId, @xCRMPortalCustomerID=PortalCustomerID,@xCRMDcpID=DcpID, @xCRMCardNumber=CardNumber, @xCRMEmailAddress=EmailAddress, @xCRMfirtLetterFirstName=firtLetterFirstName, @xCRMLastName=Surname,@xCRMAddressLine1=AddressLine1, @xCRMPostCode=PostCode FROM #InsightData where (EmailAddress=@xDCPEmailAddress ) END ELSE BEGIN SET @xTestMatchCriteria='No'+@xMatchCriteria; END END

1579

How to use in conditions?

946

How we get sum of column.

958

What is field in mysql?

874

Explain % and _ inside like statement?

961

What is triggers and how it can be used in mysql?

909

Is mysql free for enterprise?

858

What are Heap tables?

1486

How to calculate the difference between two dates?

990

What are the types of index?

907

What is join in mysql? What are the different types of join?

896

How do I transfer data from one database to another in mysql?

864

Is mysql a dbms?

830

How to extract a unit value from a date and time?

902

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