sql delete example

Example 1: delete all records from table

DELETE FROM table_name;

Example 2: delete and drop in sql

DELETE -
-DML COMMAND
-Delete Rows from the table one by one
-We can use where clause with Delete to delete single row
-Delete is slower than truncate
-ROLLBACK is possible with DELETE

DROP-
-DDL COMMAND
-Delete the entire structure or schema
-We can't use where clause with drop
-Drop is slower than DELETE & TRUNCATE
-ROLLBACK IS NOT POSSIBLE WITH DROP

TRUNCATE-
-DDL COMMAND
-Truncate deletes rows at a one goal
-We can't use where clause with Truncate
-Truncate faster than both DELETE & DROP
-Rollback is not possible with Truncate

Example 3: sql delete where in

-- Deletes all records where `columnName` matches the values in brackets.
DELETE FROM tableName WHERE columnName IN ('val1', 'val2', 'val3');

Example 4: sql delete

DELETE FROM Customers
 WHERE CustomerName='Alfreds Futterkiste';

Example 5: delete query

public function deletedata(){	

	$this->db->where('id', 2);	
	$this->db->delete('table_name');

	}