Interested to Buy Any Domain ? << Click Here >> for more details...
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 ?
- 10 Answers
- 18170 Views
- Perot Systems, I also Faced
- E-Mail Answers
Answer Posted / mohammad ali
DML
DML is abbreviation of Data Manipulation Language. It is used to retrieve, store, modify, delete, insert and update data in database.
Examples: SELECT, UPDATE, INSERT statements
DDL
DDL is abbreviation of Data Definition Language. It is used to create and modify the structure of database objects in database.
Examples: CREATE, ALTER, DROP statements
DCL
DCL is abbreviation of Data Control Language. It is used to create roles, permissions, and referential integrity as well it is used to control access to database by securing it.
Examples: GRANT, REVOKE statements
TCL
TCL is abbreviation of Transactional Control Language. It is used to manage different transactions occurring within a database.
Examples: COMMIT, ROLLBACK statements
The DELETE command is used to remove rows from a table. A WHERE clause can be used to only remove some rows. If no WHERE condition is specified, all rows will be removed. After performing a DELETE operation you need to
COMMIT or ROLLBACK the transaction to make the change permanent or to undo it.
TRUNCATE removes all rows from a table. The operation cannot be rolled back. As such, TRUCATE is faster and doesn't use as much undo space as a DELETE.
The DROP command removes a table from the database. All the tables' rows,
indexes and privileges will also be removed. The operation cannot be rolled back.
DROP and TRUNCATE are DDL commands, whereas DELETE is a DML command. Therefore DELETE operations can be rolled back (undone), while DROP and TRUNCATE operations cannot be rolled back.
| Is This Answer Correct ? | 4 Yes | 0 No |
Post New Answer View All Answers
What is an inner join?
What happens if the update subquery returns multiple rows in ms sql server?
How do you delete duplicate rows in sql server?
create index myindex on mytable(mycolumn) what type of index will get created after executing the above statement? : Sql server database administration
What is advantage data architect?
How would you use user_constraints table in DB?
how you can configure a running aggregate in SSRS?
What are “lock” hints?
Explain different types of self contained sub query?
Explain few examples of RDBMS?
What is a rollup clause?
What are the advantages of policy management?
Is null in sql server?
how to create “alternate row colour”?
What is microsoft sql server?
