title: sqlalchemy PRI and MUL keys
body: <p>I am creating sqlalchemy python script to create tables in sql database.</p>
  
  <p>I need to build a table with keys as PRI and MUL both.</p>
  
  <p>And here is what I have written to achieve that.</p>
  
  <pre><code>test_table = Table('test', metadata, Column('ClientID', Integer, unique=False,
                                              autoincrement=False,
                                              primary_key=True, nullable=False,
                                              server_default=text('0')),
                     Column('UserID', Integer, unique=False, autoincrement=False,
                            primary_key=True, nullable=False),
                     Column('ContactID', Integer, unique=False,
                            autoincrement=False, primary_key=True,
                            nullable=False),
                     Column('ConvoID', Integer, unique=False,
                            autoincrement=False, primary_key=True,
                            nullable=False),
                     Column('Direction', String(4), unique=False,
                            autoincrement=False, primary_key=True,
                            nullable=False), Column('Variable', sa.Unicode(100,
                                                                           collation='utf8mb4_unicode_ci'),
                                                    primary_key=True,
                                                    nullable=False),
                     Column('Value',
                            sa.Unicode(255, collation='utf8mb4_unicode_ci'),
                            nullable=True),
                     Column('CreatedDate', DateTime,
                            server_default=text("CURRENT_TIMESTAMP"),
                            nullable=False),
                     Column('UpdatedDate', DateTime,
                            server_default=text("CURRENT_TIMESTAMP"),
                            nullable=False),
                     Index('UserID', 'UserID', 'ContactID', 'ConvoID'),
                     )
  </code></pre>
  
  <p>But the problem is , I am not able to set this 3 columns  (<code>UserID</code>, <code>ContactID</code> and <code>ConvoId</code>) as MUL keys.</p>
  
  <p>Can anyone please help me with this ?</p>