SQL Interview Questions and Answers

SQL Interview Questions and Answers

SQL stands for Structured Query Language. It is a domain specific language for requesting information from a database. It includes database creation, deletion, fetching rows, modifying rows, etc. All RDMS as oracle, Sybase, PostGres, SQL server, MySQL, Informix MS Access use for SQL as their standard database language.

What is SQL?

What are the usages of SQL?

What is the difference between SQL and MySQL?

What is the difference between SQL and PL/SQL?

What are the subsets of SQL?

What is data definition language?

What are various DDL commands in SQL? Give brief description of their purposes.

What is data manipulation language?

What are various DML commands in SQL? Give brief description of their purposes.

What is the purpose of DML statements in SQL?

What is data control language?

What are the type of operators available in SQL?

What is the difference between clustered and non-clustered index in SQL?

What is the purpose of the condition operators BETWEEN and IN?

What are the specific uses of SQL functions?

What are the case manipulation functions of SQL?

What is the difference between cross joins and natural joins?

What is a view? Why should you use a view?

What is the difference between VARCHAR2 AND CHAR data types?

What is the purpose of the MERGE statement in SQL?

How do you copy rows from one table to another?

What is a primary key?

What is a unique key?

What is a foreign key?

What is a join?

What is normalization?

What is Denormalization?

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