文档介绍：关系数据库与SQL语言的练****试卷
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several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measurement, such as proceeds of c values are equal and equal to the design value, then the vertical installation accurate. For example a, b, and c valueswhile on horizontal vertical errors for measurement, General in iron angle code bit at measurement level points grid errors, specific method is from baseline to methyl vertical box center line distance for a,, to b vertical box distance for b, list can measured
A）1986 B）1987 C）1988 D）1989
⒏下面关于SQL语言的说法中，哪一种说法是错误的？
A）一个SQL数据库就是一个基本表
B）SQL语言支持数据库的三级模式结构
C）一个基本表可以跨多个存储文件存放，一个存储文件可以存放一个或多个基本表
D）SQL的一个表可以是一个基本表，也可以是一个视图
⒐下面所列条目中，哪一条不是标准的SQL语句？
A）ALTER TABLE B）ALTER VIEW
C）CREATE TABLE D）CREATE VIEW
下面第（10）至（12）题，基于"学生-选课-课程"数据库中如下三个关系：