How do you drop a synonym in SQL?
To drop a private synonym, either the synonym must be in your own schema or you must have the DROP ANY SYNONYM system privilege. To drop a PUBLIC synonym, you must have the DROP PUBLIC SYNONYM system privilege. You must specify PUBLIC to drop a public synonym. You cannot specify schema if you have specified PUBLIC .
How do you drop a database if it exists in SQL?
SQL Server Drop Sequence If Exists
- Drop sequence object if it exists.
- Create new sequence object.
- Drop default constraint if it exists.
- Create new default constraint.
- Truncate table.
- Restart sequence value.
- Insert data into table.
How do you drop a table if it exists?
Option 1 – DROP TABLE if exists using OBJECT_ID() function (all supported versions) Using OBJECT_ID() will return an object id if the name and type passed to it exists.
How do I delete synonyms?
synonyms for delete
- black out.
- cross out.
- cut out.
Does drop table drop synonym?
If DROP TABLE statement is used with a synonym name, both the synonym and the table identified by the synonym are dropped along with any other synonyms that reference the same table. You can prevent users from specifying a synonym in DROP TABLE statements by setting the USETABLENAME environment variable.
How do I delete an existing MySQL database?
Deleting a MySQL or MariaDB database Use the command ‘SHOW DATABASES;’ in the mysql-console like in the example above. Now copy the name of the database you want to delete. To do delete a database you need the command ‘DROP DATABASE’. The syntax is similar to creating a database.
Why 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.
How do you check table is exists or not in SQL?
Using the OBJECT_ID and the IF ELSE statement to check whether a table exists or not.
- Query :
- Query : USE [DB_NAME] GO IF EXISTS (SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = N’table_name’) BEGIN PRINT ‘Table exists.’ END ELSE BEGIN PRINT ‘Table does not exist.’ END.
- Output :
How do I find synonyms in SQL server?
Connect to your SQL instance, expand the database, and navigate to the Synonyms folder. Right-click on it and choose New Synonym. Enter the required details for the Synonym name, Synonym schema, Database Name, Object schema, Object Type, and name.
What happens to synonym when table is dropped?
If DROP TABLE statement is used with a synonym name, both the synonym and the table identified by the synonym are dropped along with any other synonyms that reference the same table.
How do I drop a column in MySQL?
Syntax. The syntax to drop a column in a table in MySQL (using the ALTER TABLE statement) is: ALTER TABLE table_name DROP COLUMN column_name; table_name.
How do I drop multiple databases in MySQL?
Be careful before you delete multiple databases in MySQL. It cannot be reversed. By default, DROP DATABASE command allows you to delete only 1 database at a time. So if you want to delete multiple databases in MySQL, you need to run separate DROP DATABASE command for each database.
How do I force drop a database?
Using the option -f or –force with dropdb command or FORCE with DROP DATABASE to drop the database, it will terminate all existing connections with the database. Similarly, DROP DATABASE FORCE will do the same.
What happens on drop if exist and the table does not exist?
The IF EXISTS clause allows the statement to succeed even if the specified tables does not exist. If the table does not exist and you do not include the IF EXISTS clause, the statement will return an error. Before dropping a table, you must first remove any stored procedures that reference the table.
Why drop table if exists?
What is “drop if exists” in SQL?
It is an optional clause and if it is mentioned in the DROP statement, it will check the object’s existence, if it exists it will drop, otherwise it will continue to execute the next statement in the block without producing any errors. Now with the introduction of the new method “DROP IF EXISTS” in SQL Server 2016 developers can write brief code.
How to check whether a database object exists before dropping it?
Checking whether a database objects like table, stored procedure, function, etc. exists and then dropping them is always the proper way to drop an object from the database. Till SQL Server 2014 there were no straightforward way to check whether the object exists before executing the drop script.
What is the syntax of using drop if exists (DIY)?
The syntax of using DROP IF EXISTS (DIY) is: As of now, DROP IF EXISTS can be used in the objects like database, table, procedure, view, function, index, trigger, default, rule, schema, aggregate, assembly, role, type, user, security policy, sequence and synonym.
How to drop a stored procedure only if it exists?
Lets start with creating a database and these objects. RETURN (‘Hello ‘ + @Name + ‘!’) In SQL Server 2016 and later versions, you can use the below statement to drop a stored procedure only if it exists. In SQL Server 2014 and older versions, you can use the below statement with IF condition to achieve the same result: