postgres modify column code example

Example 1: postgresql change column type

ALTER TABLE assets ALTER COLUMN name TYPE VARCHAR;

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;

Example 4: postgres how to add field created at

CREATE TABLE my_table
(
	id serial NOT NULL,
    user_name text,
	created_at timestamp with time zone DEFAULT CURRENT_TIMESTAMP //here
)

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