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Database Systems: Design, Implementation, & Management
Database Systems: Design, Implementation, & Management
Concepts of Database Management (MindTap Course List)
Concepts of Database Management
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Databases A Beginner's Guide
In PostgreSQL, you can call a function from another schema by specifying the schema name when calling the function. For example, if you have a function named my_function in a schema named my_schema, you can call it from another schema using the following syntax: SELECT my_schema.my_function(). By specifying the schema name before the function name, PostgreSQL will be able to locate and execute the function from the specified schema. This allows you to access and utilize functions defined in other schemas within your database.
How to grant access to a function in another schema in PostgreSQL?
To grant access to a function in another schema in PostgreSQL, you can use the GRANT command. Here's the general syntax:
GRANT EXECUTE ON FUNCTION <function_name> (<parameter_types>) TO <role_name>;
For example, if you want to grant access to a function named my_function in the public schema to a role named my_role, you would do the following:
GRANT EXECUTE ON FUNCTION public.my_function() TO my_role;
Make sure that the function exists in the specified schema and that the role has the necessary privileges to access it.
What happens if a function in another schema is dropped in PostgreSQL?
If a function in another schema is dropped in PostgreSQL, the function will be permanently removed from the database and will no longer be accessible or able to be executed. Any references to that function in other parts of the database (such as stored procedures or triggers) will no longer be valid and may result in errors when attempting to execute them. It is important to carefully consider the potential impact of dropping a function in another schema before doing so, and to ensure that any necessary steps are taken to update or remove any dependencies on that function.
How to list all functions in a different schema in PostgreSQL?
To list all functions in a different schema in PostgreSQL, you can use the following SQL query:
SELECT routines.routine_name FROM information_schema.routines WHERE routines.specific_schema = 'your_schema_name' AND routines.routine_type = 'FUNCTION';
Replace 'your_schema_name' with the name of the schema you want to list the functions for. This query will return a list of all functions in the specified schema.