Скачать или смотреть SQLite Tutorial: Updating and Deleting Data in Python | Python in Tamil

Certainly! In SQLite, the UPDATE and DELETE statements are used to modify and remove data from a table, respectively. Here's an explanation of how these statements work:

*UPDATE statement:*

The UPDATE statement is used to modify existing records in a table. It allows you to change the values of one or more columns for one or more rows in the table. The basic syntax of the UPDATE statement is as follows:

```sql
UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;
```

`table_name`: The name of the table you want to update.
`column1`, `column2`, ...: The columns you want to modify.
`value1`, `value2`, ...: The new values you want to set for the corresponding columns.
`WHERE condition`: An optional condition that specifies which rows should be updated. If omitted, all rows in the table will be updated.

Here's an example of an UPDATE statement in SQLite:

```sql
UPDATE employees
SET salary = 50000, department = 'Sales'
WHERE employee_id = 1001;
```

In the above example, the `employees` table is being updated. The `salary` and `department` columns are being modified for the employee with `employee_id` equal to 1001.

*DELETE statement:*

The DELETE statement is used to remove one or more records from a table. It allows you to delete specific rows that match a given condition. The basic syntax of the DELETE statement is as follows:

```sql
DELETE FROM table_name
WHERE condition;
```

`table_name`: The name of the table you want to delete records from.
`WHERE condition`: An optional condition that specifies which rows should be deleted. If omitted, all rows in the table will be deleted.

Here's an example of a DELETE statement in SQLite:

```sql
DELETE FROM employees
WHERE employee_id = 1001;
```

In the above example, the `employees` table is being modified. The row(s) where `employee_id` is equal to 1001 will be deleted from the table.

Both the UPDATE and DELETE statements can be executed using the `execute()` method provided by SQLite libraries in various programming languages, including Python.