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What is the purpose of primary key?


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More SQL PLSQL Interview Questions

I have a tablle like this: cust acc ----------- a 1 b 2 b 3 c 4 c 5 c 6 I Want below o/p: cust acc --------------- a 1 b 2|3 c 4|5|6 Please any one can you have any ideas share me. I have urgent requirement.

7 Answers   MTS,


Let us suppose we have a table with structure in order empno empname empdesig empcountry and now i want to re-organize the columns of this table to empno empdesig empname empcountry how can i do this with queries ? assume that table contains the data.

3 Answers  


What does desc stand for?

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How would you hide a table in sql. ie the table can be only visible to its maker?

3 Answers  


How to retrieve Duplicate Rows only in a Table? Suppose if a Table Name is "Education". It consists of multiple columns. Then if we insert rows into this table with duplicate records then how can we retrieve only duplicate records from that table?

29 Answers   Alps, Aricent, Bank Of America, Wipro,


What is the use of index in hive?

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How to create a menu in sqlplus or pl/sql?

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How to display Row Number with Records in Oracle SQL Plus?

0 Answers   MCN Solutions,


Does normalization improve performance?

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What does stand for in sql?

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Is json a nosql?

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Practice 1: Changes to data will only be allowed on tables during normal office hours of 8.45 in the morning until 5.30 in the afternoon, MONDAY through FRIDAY. A. Create a procedure called SECURE_DML that prevents the DML statement from executing outside of normal office hours, returning the message: “you may only make changes during normal office hours” b. Create a statement trigger on the PRODUCT table which calls the above procedure. c. Test it by inserting a new record in the PRODUCT table.

1 Answers   Tech Mahindra,


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