SQL Delete is a command used to delete one or more rows from a table in a database. It is one of the most commonly used commands in SQL and is used to remove unwanted data from a table. The Delete command is used to remove data from a table based on certain conditions. It is a powerful command that can be used to delete data from a single table or multiple tables at once.
The syntax for the Delete command is as follows:
DELETE FROM table_name WHERE condition;
The Delete command starts with the keyword DELETE, followed by the keyword FROM, which specifies the table from which the data is to be deleted. The WHERE clause is used to specify the condition that must be met for the data to be deleted. If the WHERE clause is not specified, all the rows in the table will be deleted.
Let's take a look at some examples of how the Delete command can be used:
To delete a single row from a table, we can use the following code:
DELETE FROM customers WHERE customer_id = 1;
This code will delete the row from the customers table where the customer_id is equal to 1.
To delete multiple rows from a table, we can use the following code:
DELETE FROM customers WHERE customer_id IN (1, 2, 3);
This code will delete the rows from the customers table where the customer_id is equal to 1, 2, or 3.
To delete all the rows from a table, we can use the following code:
DELETE FROM customers;
This code will delete all the rows from the customers table.
It is important to note that the Delete command is a powerful command and should be used with caution. It is recommended to take a backup of the data before deleting any rows from a table.
The Delete command is a powerful command in SQL that is used to remove unwanted data from a table. It can be used to delete a single row, multiple rows, or all the rows from a table. It is important to use the Delete command with caution and take a backup of the data before deleting any rows from a table.