MariaDB FROM Keyword
The MariaDB FROM keyword is used to specify the table from which the data should be selected or deleted.
Example:
Consider a database table called Employee with the following records:
EmpID | Name | City | Age | Salary |
---|---|---|---|---|
1 | John | London | 25 | 3000 |
2 | Marry | New York | 24 | 2750 |
3 | Jo | Paris | 27 | 2800 |
4 | Kim | Amsterdam | 30 | 3100 |
5 | Ramesh | New Delhi | 28 | 3000 |
6 | Huang | Beijing | 28 | 2800 |
-
To select the Name and Salary data of the employees present in the Employee table, the following query can be used:
SELECT Name, Salary FROM Employee;
This will produce the result as shown below:
Name Salary John 3000 Marry 2750 Jo 2800 Kim 3100 Ramesh 3000 Huang 2800 -
To select all fields of the Employee table, the query will be:
SELECT * FROM Employee;
This result of the following code will be:
EmpID Name City Age Salary 1 John London 25 3000 2 Marry New York 24 2750 3 Jo Paris 27 2800 4 Kim Amsterdam 30 3100 5 Ramesh New Delhi 28 3000 6 Huang Beijing 28 2800 -
To delete the records of an employee whose EmpID is 5, the query will be:
DELETE FROM Employee WHERE EmpID = 5; --See the result SELECT * FROM Employee
Now the Employee table will contain following records:
EmpID Name City Age Salary 1 John London 25 3000 2 Marry New York 24 2750 3 Jo Paris 27 2800 4 Kim Amsterdam 30 3100 6 Huang Beijing 28 2800 -
Similarly, to delete the records of an employee where city starts with 'New', the query will be:
DELETE FROM Employee WHERE City LIKE 'New%'; -- see the result SELECT * from Employee;
Now the Employee table will contain following records:
EmpID Name City Age Salary 1 John London 25 3000 3 Jo Paris 27 2800 4 Kim Amsterdam 30 3100 6 Huang Beijing 28 2800
❮ MariaDB Keywords