Key field in a table?
From: Sheng Juexin <sjx_at_peon.rightiming.com>
Date: 19 Jan 1999 20:16:58 GMT
Message-ID: <782p7q$m0h$1_at_news.rightiming.com>
I want to create a table with a field "User_Id". I want "User_Id" to be the key to distinguish different rows in the table. If I insert a new row with the same "Uer_Id" value, the Oracle should refuse to insert the now row. Can I define such a kind of table?
Date: 19 Jan 1999 20:16:58 GMT
Message-ID: <782p7q$m0h$1_at_news.rightiming.com>
I want to create a table with a field "User_Id". I want "User_Id" to be the key to distinguish different rows in the table. If I insert a new row with the same "Uer_Id" value, the Oracle should refuse to insert the now row. Can I define such a kind of table?
Thank you!
sjx Received on Tue Jan 19 1999 - 21:16:58 CET