postgresql drop primary key constraint
alter table public.test1 drop constraint test1_pkey
postgresql drop primary key constraint
alter table public.test1 drop constraint test1_pkey
postgres alter table add primary key
-- To set a column as primary key:
ALTER TABLE distributors ADD PRIMARY KEY (tablename);
create table postgresql primary key
CREATE TABLE TABLE (
column_1 data_type PRIMARY KEY,
column_2 data_type,
…
);
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