postgresql add column with constraint
ALTER TABLE customers
ADD COLUMN contact_name VARCHAR NOT NULL;
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;
alter table add column psql
ALTER TABLE table_name
ADD column_name data_type column_constraint;
postgres add column from another table
UPDATE student
SET name = institute.inst_name
FROM institute
WHERE student.student_id = institute.inst_id;
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