Why do we use sql constraints?


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More SQL PLSQL Interview Questions

Differentiate between syntax and runtime errors.

0 Answers  


i want insert 10 records from table a to table b. if i m using statement level trigger how many record insert ?in row level trigger how many record inserted???

3 Answers   Scope International,


What is an Integrity Constraint?

4 Answers  


What are the usage of SAVEPOINTS?

5 Answers  


I Have A Table Like This. Cityno Cityname Mails 1 Bangalore 8km 2 Hsr Layout 20km 3 Mejistic 30km 4 Jayadeva 55km 5 Itpl 80km 6 Hebbal 115km I Have Data Like This I Want O/p Like This Distance No.ofcity 0-50km 3 51-100km 2 101-150km 4 And So On

6 Answers   DELL, HCL, Oracle,






What does partition by mean in sql?

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there is A table and B table in A table there 5 rows and in b table there are 2 rows i am firing query select * from a,b what will be the output?

7 Answers   Cognizant,


Can we join more than 2 tables in sql?

0 Answers  


What is difference between inner join and cross join?

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what is union? : Sql dba

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When should I use nosql database?

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What is the difference between syntax error and runtime error?

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