There is no ALTER EXTERNAL TABLE statement in the SQL standard or regular PostgreSQL. This is the default behavior.Īdd a new column to an external table definition: ALTER EXTERNAL TABLE ext_expenses ADD COLUMN manager text Ĭhange the owner of an external table: ALTER EXTERNAL TABLE ext_data OWNER TO jojo Ĭhange the data type of an external table: ALTER EXTERNAL TABLE ext_leads ALTER COLUMN acct_code TYPE integer ĪLTER EXTERNAL TABLE is a Greenplum Database extension. 1 Answer Sorted by: 4 This is because PostgreSQL does not store the view definition as an SQL string, but as a parsed query tree. Refuse to drop the column or constraint if there are any dependent objects. The role name of the new owner of the external table.Īutomatically drop objects that depend on the dropped column, such as a view that references the column. The name (possibly schema-qualified) of an existing external table definition to alter.ĭata type of the new column, or new data type for an existing column. To modify this information, you must drop and recreate the external table definition. The ALTER EXTERNAL TABLE and ALTER TABLE commands cannot modify the type external table (read, write, web), the table FORMAT information, or the location of the external data. A superuser has these privileges automatically.Ĭhanges to the external table definition with either ALTER EXTERNAL TABLE or ALTER TABLE do not affect the external data. To alter the owner, you must also be a direct or indirect member of the new owning role, and that role must have CREATE privilege on the external table's schema. To change the schema of an external table, you must also have CREATE privilege on the new schema. You must own the external table to use ALTER EXTERNAL TABLE or ALTER TABLE. Set (change) the distribution policy (writable external table only).Use the ALTER TABLE command to perform these actions on an external table. OWNER - Changes the owner of the external table to the specified user.ALTER COLUMN TYPE - Changes the data type of a table column.The CASCADE keyword is required if anything outside the table depends on the column, such as a view that references the column. If you drop readable external table columns, it only changes the table definition in Greenplum Database. DROP COLUMN - Drops a column from the external table definition.ADD COLUMN - Adds a new column to the external table definition.These are the supported ALTER EXTERNAL TABLE actions: Synopsis ALTER EXTERNAL TABLE ĪLTER EXTERNAL TABLE changes the definition of an existing external table. The ALTER TABLE command is very similar to the CREATE. Press Ctrl+Q again to open this documentation in the Documentation tool window.Changes the definition of an external table. If you need to change the schema of an existing table in PostgreSQL, you can use the ALTER TABLE command. Select the necessary table in the Database Explorer and press Ctrl+Q ( View | Quick Documentation). To see the table preview, click Show table preview.įor PostgreSQL and MySQL databases, table preview also contains information about the table size. Quick Documentation displays the information about the table: data source, database, schema, name, auto-generated definition, and table preview. If a qualified object name has more than 36 symbols, it is truncated.įor the column icons, see Possible icon combinations for columns. If you have only one data source, DataGrip does not display the data source name in the tab name. If the data source has a name that is longer than 20 symbols, the name is truncated. It seems that the only solution is to DROP dependent objects, make desired changes to the target object and then recreate dropped objects. For example, if you open two actor tables from different schemas, the schema name is added in the tab name. Very often when you try to ALTER TABLE or REPLACE VIEW it tells you that you cannot do it, because there’s another object (typically a view or materialized view), which depends on the one you want to modify. Tab names for objects are qualified if you open two tabs of objects with the same name. The Always show qualified names for database objects option is now turned off by default. The following rules are applied to long tab titles: In DataGrip, each table opens in a separate tab. You can see a reference on node and object icons in the Icons for data sources and their elements chapter of Database Explorer topic.įor the table column icons, refer to Possible icon combinations for columns. Tables can be seen in the Database Explorer. For more information about the view, see View data. When you double-click a table in the Database Explorer ( View | Tool Windows | Database Explorer), the table is opened in the editor in the Table view. With DataGrip, you can perform data manipulation and data definition operations with tables. The table has a specified number of columns, but can have any number of rows. Data in a table is stored in a cell that is an intersection of a vertical column and horizontal row. A database table is a structure that organises data into rows and columns.
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