удалите все записи из таблицы
DELETE FROM table_name;
sql удалить
DELETE FROM table_name WHERE condition;
-- Ex.
DELETE FROM Customers WHERE CustomerName='Mustafa Mbari';
sql удалить, где в
-- Deletes all records where `columnName` matches the values in brackets.
DELETE FROM tableName WHERE columnName IN ('val1', 'val2', 'val3');
запрос на удаление sql
CREATE PROC dbo.DeleteLotsOfStuff
(@id int)
AS
Begin
DELETE FROM login WHERE klantid = @id
DELETE FROM klantGegevens WHERE klantid = @id
DELETE FROM orderGegevens WHERE loginNr = @id
End