>>BTW, the correct syntax for above INSERT will be:
>>

>>insert into Ten_name (ten_pk, user_id, user_pwrd)
>>select ten_pk, user_id, user_pwrd from Tenant x

>
>Will that work if the primary key is an auto-increment integer?

What is the goal? Insert exactly same PK or let the PK autogenerate?

In the latter case you need to remove PK column from the INSERT command fields.

In the former case see SET INDENTITY INSERT command.