1. What are the grouping function in SQL ?
2. If base table of a view deleted means, what will happen
while we querying on view ? will give any error ?
3. Difference between DROP, DELETE, TRUNCATE table ?
4. What is constraints and types ?
5. What is max size of nchar & nvarchar ?
6. Define ROLLBACK, COMMIT, SAVE POINT
7. How non-clustered better ? or rank the Clustered,
Non-Clustered and Table scan in performance wise
8. Select 10 rows from a table ?
9. Define DML, DDL, DCL, DTL commands ?
10. What is mean by NULL value ? NULL means "" or 0 or
undefined ?
11. Default constraints ?
12. Can we have more then primary Key in table ?
13. Type of integrity ? Entity, Referential, Domain ?
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Answer Posted / laxman
What are the grouping function in SQL ?
Grouping functions are:
max()
min()
sum()
avg()
Select 10 rows from a table ?
select * from table_name where count(*) <=10
or
select top 10 from table _name
10. What is mean by NULL value ? NULL means "" or 0 or
undefined ?
Null is not equal to "" or 0. it is un identified value
12. Can we have more then primary Key in table ?
no, we can't.
2. If base table of a view deleted means, what will happen
while we querying on view ? will give any error ?
i dont know exactly. but it likely base table doesnt exists.
4. What is constraints and types ?
types:
primary key
foreign key
not null
unique
defaults
check
rule
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