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今天考数据库,这是题目和我的答案![3]

[入库：2005年8月18日] [更新：2007年3月24日]

本文简介：选择自 soaktech 的 blog
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5.

 

for two tables to be union compatible, corresponding columns from each table should have which of the following?

 

 

 

 (a) different domains
 (b) different names
 (c) the same domain
 (d) the same name

 

 

 

6.

 

in the relational model, which of the following is true about the data type of a column?

 

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