Answers for "postgres add column if not exists"

postgresql add column with constraint

ALTER TABLE customers 
ADD COLUMN contact_name VARCHAR NOT NULL;

Posted by: Guest on February-18-2020

postgres add not null to existing column

ALTER TABLE table_name ALTER COLUMN column_name SET NOT NULL;

Posted by: Guest on March-12-2020

add column if not exists postgresql

ALTER TABLE table_name ADD COLUMN IF NOT EXISTS column_name INTEGER;

Posted by: Guest on February-17-2021

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