What is nvl function?

4 Answers   Cap Gemini,

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how instead of triger is helpful for mutating tables errors handlling ?

2 Answers   Oracle,

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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?

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

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what is subquery? : Sql dba

0 Answers  

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table :- city name country code abc 11 bcd 22 cde 232 def 33 write a procedure , so that when we give a phone no. eg - 1123456789 - o/p sud be city name = abc if phone no. - 2322345897 , o/p sud be =cde note - bcd and cde city name sud be diff. as dey diff only with th last no. Pls ans. this questnion.

1 Answers  

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Why do we need unique key in a table?

0 Answers  

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Can you inner join the same table?

0 Answers  

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i have table T!. A B C D NULL 1 2 3 4 NULL 5 6 7 8 NULL 9 10 11 12 NULL. I WANT COUNT OF NULL VALUES IN TABLE. WRITE A QUERY.

14 Answers   iGate, Wipro,

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IN A TABLE HAVE ONE COLUMN PRIMARY KEY..IT WILL NOT ALLOWS NULL VALUES AND DUPLICATE VALUES..INSTEAD OF PRIMARY KEY WHY CANT WE USE UNIQUE AND NOT NULL.THESE TWO ALSO DOESNT ACCEPT NULL VALUES IN NOT NULL AND UNIQUE DOESNT ACCEPT DUPLICATE VALUES? SO WHAT IS THE DIFEERENCE BETWEEN(UNIQUE,NOT NULL) AND PRIMARY KEY??????

8 Answers   rsystems,

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How to create an array in pl/sql?

0 Answers  

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when normalization is required

3 Answers   HCL,

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What is mutating trigger?

0 Answers  

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