Most of the staple foods in China are boiling, and this habit dates from ( ).
A: Paleolithic Age
B: Mesolithic Age
C: Neolithic Age
D: 无
A: Paleolithic Age
B: Mesolithic Age
C: Neolithic Age
D: 无
举一反三
- In digital age, people’s reading habit has changed from reading to scanning.
- 若有关系St (NO，NAME，SEX，AGE)，删除其中AGE字段的SQL语句是 （ ）。 A: ALTER TABLE St DROP AGE B: DROP AGE FROM St C: ALTER TABLE St DELETE AGE D: DELETE AGE FROM St
- (single choice) In China, when should children get their first dose of measles? A: 6 months of age B: 8 months of age C: 9 months of age D: 12 months of age E: 15 months of age
- 检索所有比“李乐”年龄大的学生姓名、年龄和性别。正确的SELECT语句是（ A ）。 A: SELECT SN，AGE，SEX FROM SWHERE AGE＞(SELECT AGE FROM S WHERE SN="李乐") B: SELECT SN，AGE，SEXFROM SWHERE SN＝"李乐" C: SELECT SN，AGE，SEX FROM SWHERE AGE＞(SELECT AGEWHERE SN="李乐") D: SELECT SN，AGE，SEX FROM SWHERE AGE＞李乐．AGE
- 假定有学生关系S，结构为S(SID, SNAME, AGE)，其中SID为学号，SNAME为姓名，AGE为年龄。查询所有比“李军”年龄大的学生的姓名、年龄，正确的SQL语句是（ ）。 A: SELECT SNAME, AGE FROM S WHERE AGE > ( SELECT AGE FROM S WHERE SNAME = '李军' ) B: SELECT SNAME, AGE FROM S WHERE AGE >( SNAME= '李军' ) C: SELECT SNAME, AGE FROM S WHERE AGE > ( SELECT AGE WHERE SNAME='李军' ) D: SELECT SNAME, AGE FROM S WHERE AGE>李军.AGE