Question: Why Drop Table If Exists?

How do you drop a table if it exists in SQL?

SQL Server DROP TABLEFirst, specify the name of the table to be removed.Second, specify the name of the database in which the table was created and the name of the schema to which the table belongs.

The database name is optional.

Third, use IF EXISTS clause to remove the table only if it exists..

How do you check if a table exists in SQL?

SQL: Check if table existsYou can use this table with an IF THEN clause do determine how your query responds whether or not a table exists. … IF EXISTS (SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = N’employee_ids’) BEGIN PRINT ‘Yes’ END ELSE BEGIN PRINT ‘No’ End.More items…•

What is drop table if exists?

The DROP TABLE statement deletes the specified table, and any data associated with it, from the database. The IF EXISTS clause allows the statement to succeed even if the specified tables does not exist. … Attempting to drop the table before dropping the procedure will result in an error.

Are indexes dropped when a table is dropped?

Dropping a table removes the table definition from the data dictionary. All rows of the table are no longer accessible. All indexes and triggers associated with a table are dropped. … All synonyms for a dropped table remain, but return an error when used.

What does drop table do in SQL?

The drop table command is used to delete a table and all rows in the table. To delete an entire table including all of its rows, issue the drop table command followed by the tablename. drop table is different from deleting all of the records in the table.

Can Db_owner drop database?

Members of the db_owner fixed database role can perform all configuration and maintenance activities on the database, and can also drop the database in SQL Server.

How do you clear a database?

To delete a databaseIn Object Explorer, connect to an instance of the SQL Server Database Engine, and then expand that instance.Expand Databases, right-click the database to delete, and then click Delete.Confirm the correct database is selected, and then click OK.

Why we use full join in SQL?

The SQL FULL JOIN command LEFT JOIN and RIGHT JOIN each return unmatched rows from one of the tables— FULL JOIN returns unmatched rows from both tables. It is commonly used in conjunction with aggregations to understand the amount of overlap between two tables.

Are temp tables dropped automatically?

Temp tables are automatically dropped as soon as they go out of scope (the proc that they were created in completes) or the connection that created them closes.

Do we need to drop table variable in SQL Server?

We do not require dropping the table variable. As mentioned earlier, the scope of the table variable is within the batch. The scope of it lasts at the end of the batch or procedure.

Why is the drop database statement used?

The DROP DATABASE Statement is used to drop or delete a database. Dropping of the database will drop all database objects (tables, views, procedures etc.) … The user should have admin privileges for deleting a database. The DROP statement cannot be rollback.

Does Droptable delete data?

The DROP TABLE is another DDL (Data Definition Language) operation. But it is not used for simply removing data from a table; it deletes the table structure from the database, along with any data stored in the table. This removes all data in the table product and the structure of the table. …