alter column postgres code example
Example 1: postgresql add column with constraint
ALTER TABLE customers
ADD COLUMN contact_name VARCHAR NOT NULL;
Example 2: postgresql change column type
ALTER TABLE assets ALTER COLUMN name TYPE VARCHAR;
Example 3: alter column in table postgres
ALTER TABLE table_name
ALTER COLUMN column_name TYPE column_definition;
Example 4: update column data type postgres
ALTER TABLE table_name
ALTER COLUMN column_name [SET DATA] TYPE new_data_type;