Advertisements
Advertisements
प्रश्न
Write the difference between table constraint and column constraint?
Advertisements
उत्तर
Column constraint:
Column constraints apply only to an individual column.
Table constraint:
Table constraints apply to a group of one or more columns.
APPEARS IN
संबंधित प्रश्न
The command to delete a table is ______
The clause used to sort data in a database.
Write a short note on Primary key constraints.
Write a SQL statement to modify the student table structure by adding a new field.
Write any three DDL commands.
Write a SQL statement using the DISTINCT keyword.
Write the different types of constraints and their functions.
Consider the following employee table. Write SQL commands for the question.
| EMP CODE | NAME | DESIG | PAY | ALLO WANCE |
| S1001 | Hariharan | Supervisor | 29000 | 12000 |
| P1002 | Shaji | Operator | 10000 | 5500 |
| P1003 | Prasad | Operator | 12000 | 6500 |
| C1004 | Manjima | Clerk | 8000 | 4500 |
| M1005 | Ratheesh | Mechanic | 20000 | 7000 |
To remove the employees who are mechanics.
Consider the following employee table. Write SQL commands for the question.
| EMP CODE | NAME | DESIG | PAY | ALLO WANCE |
| S1001 | Hariharan | Supervisor | 29000 | 12000 |
| P1002 | Shaji | Operator | 10000 | 5500 |
| P1003 | Prasad | Operator | 12000 | 6500 |
| C1004 | Manjima | Clerk | 8000 | 4500 |
| M1005 | Ratheesh | Mechanic | 20000 | 7000 |
To add a new row.
Construct the following SQL statement in the student table-
SELECT statement using ORDER BY clause.
