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==Specify not null constaint for column==



   
  <!-- start source code -->
   
    <source lang="sql">

postgres=#
postgres=# CREATE TABLE products (
postgres(#    product_no integer NOT NULL,
postgres(#    name text NOT NULL,
postgres(#    price numeric
postgres(# );
CREATE TABLE
postgres=#
postgres=#
postgres=# drop table products;
DROP TABLE
postgres=#
postgres=#
           
       </source>