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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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What is the use of CASCADE CONSTRAINTS?
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Why does the following command give a compilation error? DROP TABLE &TABLE_NAME;
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What is the difference between TRUNCATE and DELETE commands?
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What is the output of the following query SELECT TRUNC(1234.5678,-2) FROM DUAL;
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what is the difference between replace and translate functions?
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What will be the output of the following query? SELECT DECODE(TRANSLATE('A','1234567890','1111111111'), '1','YES', 'NO' );
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What are the advantages and disadvantages of primary key and foreign key in SQL?
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How we get second highest salary in database. Please show me this coding.
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Which date function is used to find the difference between two dates?
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Difference between decode and case. in which case we are using case and in which case we are using decode? with an example.
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What is the difference between cross product & Cartesian product?
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How can i hide a particular table name of our schema.
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How to programmatically find out when the SQL Server service started?
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What is a default TCP/IP socket assigned for SQL Server?
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Difference between Stored Procedure and Trigger
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What will be the output of the following query? SELECT REPLACE(TRANSLATE(LTRIM(RTRIM('!! ATHEN !!','!'), '!'), 'AN', '**'),'*','TROUBLE') FROM DUAL;
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What is outer join?Explain with examples.
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What command is used to create a table by copying the structure of another table?
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How to delete same id in rows? For example empid=5 repeated for times in rows. How to delete which sql query is used?
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What does the following query do? SELECT SAL + NVL(COMM,0) FROM EMP;
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