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Groups > comp.databases.ms-sqlserver > #1671
| From | "Tony Johansson" <johansson.andersson@telia.com> |
|---|---|
| Newsgroups | comp.databases.ms-sqlserver |
| Subject | Re: A question about relationship |
| Date | 2014-02-11 15:39 +0100 |
| Organization | A noiseless patient Spider |
| Message-ID | <lddcn4$i2b$1@dont-email.me> (permalink) |
| References | <ldan3d$f0i$1@dont-email.me> <XnsA2D0F0AEE3E6Yazorman@127.0.0.1> |
Yes a customer without order sounds ok But order without customer is incorrect. //Tony "Erland Sommarskog" <esquel@sommarskog.se> skrev i meddelandet news:XnsA2D0F0AEE3E6Yazorman@127.0.0.1... > Tony Johansson (johansson.andersson@telia.com) writes: >> What I find strange is the relationship between Customer and Order. >> The book print the relationship between Customer and Order like this >> !--------------! !-------------------! >> ! Customer ! 0.1 ................ * ! Order ! >> !--------------! !-------------------! >> I found this strange because it means you can have orders without a >> Customer. > > Not sure how to interpret that, but there can certainly be customers > without orders. I believe that Northwind has three of them. > > > -- > Erland Sommarskog, Stockholm, esquel@sommarskog.se
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A question about relationship "Tony Johansson" <johansson.andersson@telia.com> - 2014-02-10 15:18 +0100
Re: A question about relationship Erland Sommarskog <esquel@sommarskog.se> - 2014-02-10 23:39 +0100
Re: A question about relationship "Tony Johansson" <johansson.andersson@telia.com> - 2014-02-11 15:39 +0100
Re: A question about relationship Ross Presser <rpresser@gmail.com> - 2014-02-11 07:11 -0800
Re: A question about relationship bradbury9 <ray.bradbury9@gmail.com> - 2014-02-11 08:43 -0800
Re: A question about relationship Ross Presser <rpresser@gmail.com> - 2014-02-11 09:33 -0800
Re: A question about relationship Lennart Jonsson <erik.lennart.jonsson@gmail.com> - 2014-02-11 18:01 +0100
Re: A question about relationship Erland Sommarskog <esquel@sommarskog.se> - 2014-02-11 21:54 +0100
Re: A question about relationship rja.carnegie@gmail.com - 2014-02-11 13:49 -0800
Re: A question about relationship Erland Sommarskog <esquel@sommarskog.se> - 2014-02-11 23:23 +0100
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