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SQL Interview Questions & Answers - Learning Mode

SQL Interview Questions & Answers - Learning Mode

SQL (pronounced "ess-que-el") stands for Structured Query Language. SQL is used to communicate with a database. According to ANSI (American National Standards Institute), it is the standard language for relational database management systems. SQL consists of a data definition language, data manipulation language, and Data Control Language. The scope of SQL includes data insert, query, update and delete, schema creation and modification, and data access control. Although SQL is often described as, and to a great extent is, a declarative language (4GL), it also includes procedural elements.

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SQL Interview Questions & Answers - Learning Mode
Try SQL Interview Questions & Answers - Exam Mode
Question: What is the use of CASCADE CONSTRAINTS?

Answer: When this clause is used with the DROP command, a parent table can be dropped even when a child table exists. Source:
Question: Why does the following command give a compilation error?

Answer: Variable names should start with an alphabet. Here the table name starts with an '&' symbol. Source:
Question: What is the difference between TRUNCATE and DELETE commands?

Answer: TRUNCATE is a DDL command whereas DELETE is a DML command. Hence DELETE operation can be rolled back, but TRUNCATE operation cannot be rolled back.<br>WHERE clause can be used with DELETE and not with TRUNCATE. Source:
Question: What is the output of the following query

Answer: 1200. Source:
Question: what is the difference between replace and translate functions?

Answer: I Think here we r discussing abt SQL.Replace function is used to replace a string as well as character to another string or character,Translate function exists in ORACLE for translating single character to some other character........ Source:
Question: What are the advantages and disadvantages of primary key and foreign key in SQL?

Answer: Primary key


1) It is a unique key on which all the other candidate keys are functionally dependent


1) There can be more than one keys on which all the other attributes are dependent on.

Foreign Key


1)It allows refrencing another table using the primary key for the other table
Question: What will be the output of the following query?
SELECT DECODE(TRANSLATE('A','1234567890','1111111111'), '1','YES', 'NO' );

Answer: NO.
Explanation :
The query checks whether a given string is a numerical digit. Source:
Question: How we get second highest salary in
database. Please show me this coding.

Answer: select top 1 from (select top 2 from (select salary from employee order by salary) order by salary dsc) Source:
Question: Which date function is used to find the difference between two dates?

Answer: MONTHS_BETWEEN. Source:
Question: State true or false.
all denote the same operation.

Answer: True. Source:
Question: Difference between decode and case.
in which case we are using case and in which case we are using decode?
with an example.

Answer: First I will give one example using 'decode'


I have used the decode function on 'deptno' column. It will give the user-friendly output. instead of using 'accounting', 'research'.. We can use anything we want to get the friendly outputs.

I have to check-out the ' Source:
Question: How can i hide a particular table name of our schema.

Answer: you can hide the table name by creating synonyms.

e.g) you can create a synonym y for table x

create synonym y for x;
Question: What is the difference between cross product & Cartesian product?

Answer: There is no difference between Cartesian product and cross join.
although there syntax are different but they work as a same.

Cartesian or cross product selects all rows from both the table.

tableA 6 rows
tableB 6 rows

Cartesian or cross product
36 rows.
Question: How to programmatically find out when the SQL Server service started?

Question: What is a default TCP/IP socket assigned for SQL Server?

Answer: 1433 is default tcp/ip socket sql server. Source:
Question: What is outer join?Explain with examples.

Answer: The Left Outer Join returns all the rows from the Left Table with the values that match with the Key from the second table.

The Right Outer Join returns all the rows from the Right Table with the values that match with the key from the first table. Source:
Question: Difference between Stored Procedure and Trigger

Answer: Information related to Stored procedure you can see in USER_SOURCE,USER_OBJECTS(current user) tables.

Information related to triggers stored in USER_SOURCE,USER_TRIGGERS (current user) Tables.

Stored procedure can't be inactive but trigger can be Inactive.
Question: What command is used to create a table by copying the structure of another table?

Answer: CREATE TABLE .. AS SELECT command
To copy only the structure, the WHERE clause of the SELECT command should contain a FALSE statement as in the following.
If the WHERE condition is true, then all the rows or rows satisfying the condition will be copied to the new table. Source:
Question: What will be the output of the following query?

Question: How to delete same id in rows?
For example empid=5 repeated for times in rows. How to delete which sql query is used?

Answer: we can use distinct clause for this type of query.distinct clause is used to remove duplicates from table
select rowid distinct from table name

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Latest 20 Questions
An offer which is open for acceptance over a period of time is: (a) Cross Offer (b) Counter Offer (c) Standing Offer (d) Implied Offer
Specific offer can be communicated to__________ (a) All the parties of contract (b) General public in universe (c) Specific person (d) None of the above
_________ amounts to rejection of the original offer. (a) Cross offer (b) Special offer (c) Standing offer (d) Counter offer
A advertises to sell his old car by advertising in a newspaper. This offer is caleed: (a) General Offer (b) Special Offer (c) Continuing Offer (d) None of the above
In case a counter offer is made, the original offer stands: (a) Rejected (b) Accepted automatically (c) Accepted subject to certain modifications and variations (d) None of the above
In case of unenforceable contract having some technical defect, parties (a) Can sue upon it (b) Cannot sue upon it (c) Should consider it to be illegal (d) None of the above
If entire specified goods is perished before entering into contract of sale, the contract is (a) Valid (b) Void (c) Voidable (d) Cancelled
______________ contracts are also caled contracts with executed consideration. (a) Unilateral (b) Completed (c) Bilateral (d) Executory
A offers B to supply books @ Rs 100 each but B accepts the same with condition of 10% discount. This is a case of (a) Counter Offer (b) Cross Offer (c) Specific Offer (d) General Offer
_____________ is a game of chance. (a) Conditional Contract (b) Contingent Contract (c) Wagering Contract (d) Quasi Contract
There is no binding contract in case of _______ as one's offer cannot be constructed as acceptance (a) Cross Offer (b) Standing Offer (c) Counter Offer (d) Special Offer
An offer is made with an intention to have negotiation from other party. This type of offer is: (a) Invitation to offer (b) Valid offer (c) Voidable (d) None of the above
When an offer is made to the world at large, it is ____________ offer. (a) Counter (b) Special (c) General (d) None of the above
Implied contract even if not in writing or express words is perfectly _______________ if all the conditions are satisfied:- (a) Void (b) Voidable (c) Valid (d) Illegal
A specific offer can be accepted by ___________. (a) Any person (b) Any friend to offeror (c) The person to whom it is made (d) Any friend of offeree
An agreement toput a fire on a person's car is a ______: (a) Legal (b) Voidable (c) Valid (d) Illegal
"Holiday Packages" announced as an advertisement are an example of _________: (a) Offer (b) Counter Offer (c) Invitation to Offer (d) None of the above
A match fixing contract between a player and a broker is a: (a) Valid Contract (b) Unenforceable Contract (c) Void Contract (d) Illegal Contract
When a bookseller sells a book on cash payment then it is called as ___________: (a) Unilateral Contract (b) Bilateral Contract (c) Executed Contract (d) Executory Contract
____________ agreements are created by situation: (a) Written (b) Oral (c) Void (d) Implied
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