ALTER TABLE
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ALTER TABLE tablename ADD CONSTRAINT constraintname UNIQUE (columns);
ALTER, ALTER DATABASE, ALTER DEFAULT PRIVILEGES- SQL, NewSQL: GraphQL (2015), SQLite,
select, insert,select count, Distributed SQL, TablePlus, Cache hit ratio,pg_stat_user_tables,EXPLAIN, Index (PostgreSQL), DDL, SQL/MED, Group by, List users, SQL Injection, SQLAlchemy,CREATE USER, CREATE ROLE, EXPLAIN, ALTER DATABASE, REVOKE, NOLOCK, NOWAIT, EXISTS, Unique constraint
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