What is the difference between drop and delete command in mysql?

The DROP TABLE statement is used to delete a table. The DELETE statement is used to delete data(records) in a table. DELETE is used to delete one or several rows from the table. DROP TABLE would remove the entire table from the database, so if you want to remove the table, you should use DROP TABLE.

What is the difference between a DROP and DELETE command?

DELETE is a Data Manipulation Language command, DML command and is used to remove tuples/records from a relation/table. Whereas DROP is a Data Definition Language, DDL command and is used to remove named elements of schema like relations/table, constraints or entire schema.

What is the difference between DELETE and DROP in databases?

Delete: The DELETE command is used to remove rows from a table. A WHERE clause can be used to only remove some rows. … Drop: The DROP command removes a table from the database. All the tables’ rows, indexes and privileges will also be removed.

What is DELETE command?

The DELETE command is used to delete specified rows(one or more). While this command is used to delete all the rows from a table. … It is a DML(Data Manipulation Language) command. While it is a DDL(Data Definition Language) command.

IT IS IMPORTANT:  Is it safe to restart SQL Server VSS writer?

Is DROP slower than DELETE?

Objects deleted using DROP are permanently lost and it cannot be rolled back. Unlike TRUNCATE which only deletes the data of the tables, the DROP command deletes the data of the table as well as removes the entire schema/structure of the table from the database.

What is use of DROP command?

DROP is used to delete a whole database or just a table. The DROP statement destroys the objects like an existing database, table, index, or view. A DROP statement in SQL removes a component from a relational database management system (RDBMS).

What is difference between delete table and delete from table?

There is no difference in your delete. However, the FROM clause is a fully functional from clause, so you can use it with JOIN .

What is the difference between the delete and TRUNCATE commands in SQL?

SQL Truncate command places a table and page lock to remove all records. Delete command logs entry for each deleted row in the transaction log. The truncate command does not log entries for each deleted row in the transaction log. Delete command is slower than the Truncate command.

What is delete command SQL?

The DELETE command is used to delete existing records in a table.

How do I DROP a database in MySQL?

To do delete a database you need the command ‘DROP DATABASE’. The syntax is similar to creating a database. ‘DROP DATABASE <name>;’, where <name> is the name of the database you want to delete.

What are 2 differences between delete and truncate?

Delete and truncate both commands can be used to delete data of the table. Delete is a DML command whereas truncate is DDL command. Truncate can be used to delete the entire data of the table without maintaining the integrity of the table. On the other hand , delete statement can be used for deleting the specific data.

IT IS IMPORTANT:  Is float number JavaScript?

Can we rollback DELETE?

We can rollback a delete query but not so for truncate and drop. When I execute queries then successfully done with rollback in delete, drop & truncate. We can rollback the data in conditions of Delete, Truncate & Drop.

What is difference between DROP TRUNCATE and DELETE?

The DROP command removes a table from the database. … DROP and TRUNCATE are DDL commands, whereas DELETE is a DML command. DELETE operations can be rolled back (undone), while DROP and TRUNCATE operations cannot be rolled back.

How do you write a DELETE query?

SQL DELETE Statement

  1. DELETE FROM table_name WHERE condition;
  2. Example. DELETE FROM Customers WHERE CustomerName=’Alfreds Futterkiste’;
  3. DELETE FROM table_name;
  4. Example. DELETE FROM Customers;
Categories PHP