SQL

postgresql add column with constraint

ALTER TABLE customers 
ADD COLUMN contact_name VARCHAR NOT NULL;

postgresql insert column

ALTER TABLE table_name
ADD COLUMN new_column_name data_type constraint;

add column postgresql

ALTER TABLE table_name
ADD COLUMN column_name1 data_type constraint,
ADD COLUMN column_name2 data_type constraint,
...
ADD COLUMN column_namen data_type constraint;
Code language: SQL (Structured Query Language) (sql)

add column postgresql

ALTER TABLE table_name
ADD COLUMN new_column_name data_type constraint;
Code language: SQL (Structured Query Language) (sql)