The delete operator is used to delete non-array objects. It calls operator delete[] and operator delete function respectively to delete the memory that the array or non-array object occupied after (eventually) calling the destructors for the array's elements or the non-array object.
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DELETE FROM table_name / DELETE FROM table_name WHERE 1=1 (is the same) Is a DML (Data Manipulation Language), you can delete all data. DML statements example: SELECT, UPDATE, etc. It is important to know this because if an application is running on a server, when we run a DML there will be no problem.
Just be sure to put the table name (or an alias) between DELETE and FROM to specify which table you are deleting from. This is simpler than using a nested SELECT statement like in the other answers.
And maybe it is answered in the "MySQL doesn't allow it", however, it is working fine for me PROVIDED I make sure to fully clarify what to delete (DELETE T FROM Target AS T). Delete with Join in MySQL clarifies the DELETE / JOIN issue.
Read How to Delete Gmail Messages in Bulk and Find all Emails with Large Attachments. Or maybe How to Automatically Delete Old Messages From Gmail if this is what you want. Another page Delete old email automatically using Google Apps Script How to Find Old Emails in Gmail is also a helpful page, with general information.
Is it allowed to delete this; if the delete-statement is the last statement that will be executed on that instance of the class? Of course I'm sure that the object represented by the this-pointer is