设有关系表S(NO,NAME,AGE),其中AGE为年龄字段,则表达式
A: E NOT BETWEEN 18 AND 24 等价于:
B: AGE<=18 OR AGE>=24
C: AGE<=18 OR AGE>24
D: AGE<18 OR AGE>=24
E: AGE<18 OR AGE>24
A: E NOT BETWEEN 18 AND 24 等价于:
B: AGE<=18 OR AGE>=24
C: AGE<=18 OR AGE>24
D: AGE<18 OR AGE>=24
E: AGE<18 OR AGE>24
举一反三
- 设有关系表S(NO,NAME,AGE),其中AGE为年龄字段,则表达式AGE NOT BETWEEN 18 AND 24等价于() A: AGE<=18 OR AGE>=24 B: AGE<=18 0R AGE>24 C: AGE<18 OR AGE>=24 D: AGE<18 0R AGE>24
- 表达式“AGE BETWEEN 18 AND 24”等价于 A: AGE>18 AND AGE<24 B: AGE>=18 AND AGE<24 C: AGE>18 AND AGE<=24 D: AGE>=18 AND AGE<=24
- 表达式“AGEBETWEEN18AND24”等价于()。 A: AGE>18ANDG<24 B: AGE>=18ANDG<24 C: AGE>18ANDG<=24 D: AGE>=18ANDAGE<=24
- 下面哪一个表达式能正确表示逻辑关系:"age≥18 或age≤60"? A: age>=18 || age B: age>=18 or age C: age>=18 | age D: age>=18 && age
- 表达式“AGE BETWEEN 18 AND 24”等价于( )。 A: AGE>18 AND G<24 B: AGE>=18 AND G<24 C: AGE>18 AND G<=24 D: AGE>=18 AND AGE<=24