Basic Computer Notions Databases

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Relational examples (cont'd)

Example relational tables

Question #2: How many babies with birth weights > 2.5 kg have been delivered by each physician?

Here are the projected columns.
B# BWt M#
9418303.6 392382
7439203.4 392382
8402382.7 238427
2304843.4 123456
7492002.9 649308
5302843.7 123456
6382013.1 649308

Next we Join this with the Mother table.

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Last modified: Wed, 2007 Mar 21 17:29:21

Slide show generated from dbms.html by Weasel 2007 Mar 21