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SQL Interview Questions & Answers

Below we have listed all the SQL Interview Questions and answers. Feel free to comment on any SQL Interview Questions or answer by the comment feature available on the page.

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SQL Interview Questions & Answers

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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Question
Rating
View Answer
What is the use of CASCADE CONSTRAINTS?
3.9 Rating
View Answer
Why does the following command give a compilation error?
DROP TABLE &TABLE_NAME;
3.7 Rating
View Answer
What is the difference between TRUNCATE and DELETE commands?
3.7 Rating
View Answer
What is the output of the following query
SELECT TRUNC(1234.5678,-2) FROM DUAL;
3.7 Rating
View Answer
what is the difference between replace and translate functions?
3.8 Rating
View Answer
What will be the output of the following query?
SELECT DECODE(TRANSLATE('A','1234567890','1111111111'), '1','YES', 'NO' );
3.5 Rating
View Answer
What are the advantages and disadvantages of primary key and foreign key in SQL?

4.2 Rating
View Answer
How we get second highest salary in
database. Please show me this coding.
3.7 Rating
View Answer
Which date function is used to find the difference between two dates?
3.5 Rating
View Answer
Difference between decode and case.
in which case we are using case and in which case we are using decode?
with an example.

3.2 Rating
View Answer
What is the difference between cross product & Cartesian product?
3.7 Rating
View Answer
How can i hide a particular table name of our schema.

3.1 Rating
View Answer
How to programmatically find out when the SQL Server service started?
3.6 Rating
View Answer
What is a default TCP/IP socket assigned for SQL Server?
3.7 Rating
View Answer
What is outer join?Explain with examples.
3.7 Rating
View Answer
Difference between Stored Procedure and Trigger

3.2 Rating
View Answer
What will be the output of the following query?
SELECT REPLACE(TRANSLATE(LTRIM(RTRIM('!! ATHEN !!','!'), '!'), 'AN', '**'),'*','TROUBLE') FROM DUAL;
3.5 Rating
View Answer
What command is used to create a table by copying the structure of another table?
3.2 Rating
View Answer
How to delete same id in rows?
For example empid=5 repeated for times in rows. How to delete which sql query is used?
3.0 Rating
View Answer
State true or false.
!=,
<>,
^=
all denote the same operation.
3.4 Rating
View Answer

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