How to delete table *or* view from PostgreSQL database?
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19-08-2019 - |
Question
I have a name of table or view in PostgreSQL database and need to delete in in single pgSQL command. How can i afford it?
I was able to select form system table to find out if there any table with such a name but stuck with procedural part:
SELECT count(*) FROM pg_tables where tablename='user_statistics';
Solution
DROP TABLE user_statistics;
DROP VIEW user_statistics;
complete syntax:
And if you want a complete function, i tried something like this:
CREATE OR REPLACE FUNCTION delete_table_or_view(objectName varchar) RETURNS integer AS $$
DECLARE
isTable integer;
isView integer;
BEGIN
SELECT INTO isTable count(*) FROM pg_tables where tablename=objectName;
SELECT INTO isView count(*) FROM pg_views where viewname=objectName;
IF isTable = 1 THEN
execute 'DROP TABLE ' || objectName;
RETURN 1;
END IF;
IF isView = 1 THEN
execute 'DROP VIEW ' || objectName;
RETURN 2;
END IF;
RETURN 0;
END;
$$ LANGUAGE plpgsql;
OTHER TIPS
Consider using DROP TABLE IF EXISTS and DROP VIEW IF EXISTS. That way you won't get an error message if it fails, just a notice.
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