PostgreSQL - Rename Table

In PostgreSQL, if you want to rename an existing table, you can use the ALTER TABLE statement along with the RENAME TO clause.

Syntax:

ALTER TABLE old_table_name RENAME TO new_table_name;

Where:

old_table_name: The current name of the table you want to rename.
new_table_name: The new name you want to assign to the table.

Example:

Suppose you have a table named old_table and you want to rename it to new_table. Here's how you would do it:

ALTER TABLE old_table RENAME TO new_table;

Important Points to Remember:

Permissions: Only the owner of the table, a superuser, or someone with the ALTER privilege on the table can rename it.
Referencing Objects: Any database objects (like views, triggers, or stored procedures) that reference the old table name will need to be updated after the renaming. These references won't automatically reflect the new table name.
Foreign Keys and Indexes: Renaming a table will not rename the associated indexes, sequences, or constraints. If the name of the table is used as a prefix for associated objects, you may want to manually rename these objects for consistency.
Application Code: If the table is used by an application, ensure that you update the application code to reference the new table name.
Backup: As a general best practice, always consider taking a backup before making structural changes to your database.

In conclusion, renaming a table in PostgreSQL is a simple task using the ALTER TABLE command. However, it's essential to update all dependent objects and application code to ensure smooth operations after the renaming process.

How to rename a table in PostgreSQL:

ALTER TABLE old_table_name RENAME TO new_table_name;

Changing table name with ALTER TABLE RENAME TO in PostgreSQL:
```
ALTER TABLE old_table_name RENAME TO new_table_name;
```

Renaming a table and its constraints in PostgreSQL:

ALTER TABLE old_table_name RENAME TO new_table_name;
ALTER TABLE new_table_name
RENAME CONSTRAINT old_constraint_name TO new_constraint_name;

Renaming multiple tables in PostgreSQL:

ALTER TABLE old_table1 RENAME TO new_table1;
ALTER TABLE old_table2 RENAME TO new_table2;

Handling dependencies when renaming a table in PostgreSQL:

-- Drop dependent objects
DROP INDEX IF EXISTS your_index;
-- Rename table
ALTER TABLE old_table_name RENAME TO new_table_name;
-- Recreate dependent objects
CREATE INDEX your_index ON new_table_name(your_column);

Renaming a table in a specific schema in PostgreSQL:

ALTER TABLE schema_name.old_table_name
RENAME TO new_table_name;

Using RENAME TABLE with CASCADE in PostgreSQL:

ALTER TABLE old_table_name RENAME TO new_table_name CASCADE;

Undoing a table rename with RENAME TABLE in PostgreSQL:
```
ALTER TABLE new_table_name RENAME TO old_table_name;
```

Renaming tables in temporary schemas in PostgreSQL:

ALTER TABLE temp_schema.old_table_name
RENAME TO new_table_name;

Renaming tables with foreign key relationships in PostgreSQL:

-- Drop foreign key constraints
ALTER TABLE referencing_table
DROP CONSTRAINT referencing_constraint;

-- Rename table
ALTER TABLE old_table_name RENAME TO new_table_name;

-- Recreate foreign key constraints
ALTER TABLE referencing_table
ADD CONSTRAINT new_constraint_name
FOREIGN KEY (referencing_column) REFERENCES new_table_name(referenced_column);

Renaming tables with indexes in PostgreSQL:

-- Drop indexes
DROP INDEX IF EXISTS old_table_index;

-- Rename table
ALTER TABLE old_table_name RENAME TO new_table_name;

-- Recreate indexes
CREATE INDEX new_table_index ON new_table_name(indexed_column);

Renaming tables with CHECK constraints in PostgreSQL:

-- Drop check constraints
ALTER TABLE old_table_name
DROP CONSTRAINT old_check_constraint;

-- Rename table
ALTER TABLE old_table_name RENAME TO new_table_name;

-- Recreate check constraints
ALTER TABLE new_table_name
ADD CONSTRAINT new_check_constraint CHECK (checked_condition);

Renaming tables and views in PostgreSQL:

ALTER TABLE old_table_name RENAME TO new_table_name;
ALTER VIEW old_view_name RENAME TO new_view_name;

Renaming tables and triggers in PostgreSQL:

-- Drop triggers
DROP TRIGGER IF EXISTS old_table_trigger ON old_table_name;

-- Rename table
ALTER TABLE old_table_name RENAME TO new_table_name;

-- Recreate triggers
CREATE TRIGGER new_table_trigger
AFTER INSERT ON new_table_name
FOR EACH ROW EXECUTE FUNCTION your_function();

Renaming tables and sequences in PostgreSQL:

-- Rename table
ALTER TABLE old_table_name RENAME TO new_table_name;

-- Rename associated sequence
ALTER SEQUENCE old_table_name_id_seq RENAME TO new_table_name_id_seq;