How to create and drop table in SQL?
To demonstrate, we'll:
- Create and populate the employees table again
- Create an index, function and trigger on it
- Create a stored procedure, function, and view that query it
What is difference between delete and drop tables in SQL?
- DELETE is a DML Command. DROP is a DCL command.
- After DELETING records one needs to issue commit or rollback. DROP is an auto commit statement.
- You can have a WHERE clause option in DELETE statement whereas you cannot have a WHERE clause option in DROP statement.
How to create, alter, rename, and drop tables in SQL?
SQL TABLE Keyword
- CREATE TABLE. The CREATE TABLE command creates a new table in the database.
- CREATE TABLE Using Another Table. A copy of an existing table can also be created using CREATE TABLE.
- ALTER TABLE. The ALTER TABLE command adds, deletes, or modifies columns in a table. ...
- DROP TABLE. The DROP TABLE command deletes a table in the database. ...
- TRUNCATE TABLE. ...
How to recover table after drop it in SQL Server?
- EaseUS SQL recovery tool can fully recover the truncated table from the database.
- It also recovers all dropped table on the condition that you only insert data after DROP TABLE.
- It can only recover some of the items if you create a new table and insert data after the DROP TABLE command.
What type of statement is DROP TABLE?
SQL DROP TABLE statement is used to remove table in a database. When you use the SQL DROP TABLE statement to remove a table, the database engine deletes all objects associated to that table including data, table structure, indexes, constraints, triggers and maybe privileges.
What is drop database statement?
DROP DATABASE returns the number of tables that were removed. The DROP DATABASE statement removes from the given database directory those files and directories that MySQL itself may create during normal operation.
How do I drop a table in MySQL?
DROP TABLE MySQL Command Syntax. To remove a table in MySQL, use the DROP TABLE statement. The basic syntax of the command is as follows: DROP [TEMPORARY] TABLE [IF EXISTS] table_name [, table_name] [RESTRICT | CASCADE];
What is the structure of SQL drop command?
A DROP statement in SQL removes a component from a relational database management system (RDBMS). Syntax: DROP object object_name Examples: DROP TABLE table_name; table_name: Name of the table to be deleted. DROP DATABASE database_name; database_name: Name of the database to be deleted.
What happens when a table is dropped?
When a table is dropped, rules or defaults on the table lose their binding, and any constraints or triggers associated with the table are automatically dropped. If you re-create a table, you must rebind the appropriate rules and defaults, re-create any triggers, and add all required constraints.
Can a drop table be used to drop a table that is referenced by a foreign key constraint?
DROP TABLE cannot be used to drop a table that is referenced by a FOREIGN KEY constraint. The referencing FOREIGN KEY constraint or the referencing table must first be dropped. If both the referencing table and the table that holds the primary key are being dropped in the same DROP TABLE statement, the referencing table must be listed first.
Can multiple tables be dropped in a database?
Multiple tables can be dropped in any database. If a table being dropped references the primary key of another table that is also being dropped, the referencing table with the foreign key must be listed before the table holding the primary key that is being referenced.
DROP Table with Cascade Constraints in Oracle
If the Employee table has some primary key, which is referred in other child tables, then first we have to drop referential constraints from the child table and then you can drop the parent table.
DROP Table with Purge Option in Oracle
If we use DROP TABLE without the PURGE option, it moves the table and its dependent objects to recycle bin, and the space occupied by them will not be freed. If we specify the PURGE option while dropping a table, it will a drop table along with its dependent objects and free the space.
Description
The SQL DROP TABLE statement allows you to remove or delete a table from the SQL database.
Example
You may have found that you've created a table that you no longer require. You can use the DROP TABLE statement to remove the table from your database.