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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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    Explain UNION, MINUS, UNION ALL and INTERSECT?
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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 are the advantages and disadvantages of primary key and foreign key in SQL?
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    what is the difference between replace and translate functions?
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    How to find out the 10th highest salary in SQL query?
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    How to find second maximum value from a table?
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    How can we delete records in a table using update table?
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    What is the default format of date in Oracle? How can I change my default date format?
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    What is the use of CASCADE CONSTRAINTS?
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    What are the wildcards used for pattern matching.
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    How we get second highest salary in database. Please show me this coding.
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    Which system table contains information on constraints on all the tables created?
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    What is the output of the following query SELECT TRUNC(1234.5678,-2) FROM DUAL;
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    Which command displays the SQL command in the SQL buffer, and then executes it
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    What is the difference between cross product & Cartesian product?
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    How do I list all of my tables? How do I list all the indexed created for a particular table(say EMP)? How do I SELECT FROM DIFFERENT USERS TABLE?
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    What is the difference between varchar & varchar2?
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    When we give SELECT * FROM EMP; How does oracle respond:
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    What is the difference between "select * from table name" and "select column_name from table name" The above quiries are simple select quiries without having any "where" clause. Secondly which query will be performed faster and why??
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    How to programmatically find out when the SQL Server service started?
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