![]() ![]() Superusers can always do this ordinary roles can only do it if they are both the current owner of the object (or a member of the owning role) and a member of the new owning role. ![]() ![]() (However, like all privileges, that right can be inherited by members of the owning role see Section 22.3.)Īn object can be assigned to a new owner with an ALTER command of the appropriate kind for the object, for exampleĪLTER TABLE table_name OWNER TO new_owner The right to modify or destroy an object is inherent in being the object's owner, and cannot be granted or revoked in itself. The following sections and chapters will also show you how these privileges are used. More detail about the meanings of these privileges appears below. The privileges applicable to a particular object vary depending on the object's type (table, function, etc.). There are different kinds of privileges: SELECT, INSERT, UPDATE, DELETE, TRUNCATE, REFERENCES, TRIGGER, CREATE, CONNECT, TEMPORARY, EXECUTE, USAGE, SET and ALTER SYSTEM. To allow other roles to use it, privileges must be granted. For most kinds of objects, the initial state is that only the owner (or a superuser) can do anything with the object. The owner is normally the role that executed the creation statement. This example ALTER TABLE will rename the order_details table to order_information.When an object is created, it is assigned an owner. new_table_name – The new name of the table.Ĭonsider an example that shows how to rename a table to PostgreSQL using the ALTER TABLE operator.The syntax for renaming a table to PostgreSQL (using ALTER TABLE operator): This PostgreSQL example ALTER TABLE will rename the column with the name notes to order_notes in the order_details table. new_name – The new name for the column.Ĭonsider an example that shows how to rename a column in a PostgreSQL table using the ALTER TABLE operator.table_name – Name of the table to change.Syntax to rename the column in the table to PostgreSQL (using ALTER TABLE operator): This ALTER TABLE example will delete the column named notes from the table named order_details. column_name – Will eliminate the name of the table column.Ĭonsider an example that shows how to remove a column in a PostgreSQL table using the ALTER TABLE statement.Syntax to delete a column in a table in PostgreSQL (using ALTER TABLE operator): We will change the data type of the notes field to varchar (500) and change the quantity column’s data type to numeric. In this ALTER TABLE example, two columns of the order details table – notes and quantity – will be altered. column_definition – The changed type of column data.Ĭonsider an example that shows how to change multiple columns in a PostgreSQL table using the ALTER TABLE statement.column_name – The name of the table column has to be modified.Syntax to change multiple columns in a table in PostgreSQL (using ALTER TABLE):ĪLTER COLUMN column_name TYPE column_definition, This ALTER TABLE example will change the column named notes to varchar (500) data type in the order_details table. column_definition – The changed column data type.Ĭonsider an example that shows how to change a column in a PostgreSQL table using the ALTER TABLE statement.column_name – The name of the column to be changed in the table.table_name – The name of the table to change.Syntax to change the column in the table in PostgreSQL (using ALTER TABLE):ĪLTER COLUMN column_name TYPE column_definition The order date field will be a date data type column, whereas the quantity column will create as an integer data type column. This example will add two columns to the order_details table – order_date and quantity. Read more MongoDB profiler and database performance problem diagnosis and identification Feature article NPMD solutions play a key role in helping IT ops support increasingly complex technologies and services with network visibility, detection of performance issues and root cause analysis.The first of its kind, DPM provides decision support for each stage of the performance problem lifecycle DPM DPM is an innovative platform for IT production database performance management. ![]()
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