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In SQL, the TRUNCATE TABLE statement is a Data Definition Language (DDL) operation that deletes all rows of a table without causing a triggered action. [1] The result of this operation quickly removes all data from a table , typically bypassing a number of integrity enforcing mechanisms.
The DROP statement is distinct from the DELETE and TRUNCATE statements, in that DELETE and TRUNCATE do not remove the table itself. For example, a DELETE statement might delete some (or all) data from a table while leaving the table itself in the database, whereas a DROP statement removes the entire table from the database.
DELETE requires a shared table lock; Triggers fire; DELETE can be used in the case of: database link; DELETE returns the number of records deleted; Transaction log - DELETE needs to read records, check constraints, update block, update indexes, and generate redo / undo. All of this takes time, hence it takes time much longer than with TRUNCATE
SQL includes operators and functions for calculating values on stored values. SQL allows the use of expressions in the select list to project data, as in the following example, which returns a list of books that cost more than 100.00 with an additional sales_tax column containing a sales tax figure calculated at 6% of the price.
2. Right click on the To Do List you want to delete. 3. Click Edit List. 4. Click Delete. 5. Select the option you want • Delete all the to do's - keeps the list by delete the To Do's. • The whole calendar - deletes the list with all the To Do's. 6. Click Delete.
A plane crashed into a car in Arizona on Tuesday, killing five people, including a child. Three adults and a child on the plane, and the driver of the car, were killed after the jet, a Honda HA ...
SQL-92 was the third revision of the SQL database query language.Unlike SQL-89, it was a major revision of the standard. Aside from a few minor incompatibilities, the SQL-89 standard is forward-compatible with SQL-92.
Keep your sign-in screen neat and tidy! Use the Manage Username setting to remove old or outdated usernames that are cluttering up your sign in screen.