alter column in postgresql code example

Example 1: how to change column type psql

ALTER TABLE table_name
ALTER COLUMN column_name [SET DATA] TYPE new_data_type;

Example 2: alter column in table postgres

ALTER TABLE table_name
  ALTER COLUMN column_name TYPE column_definition;

Example 3: update column data type postgres

ALTER TABLE table_name
ALTER COLUMN column_name [SET DATA] TYPE new_data_type;