【单选题】STUDENTS表结构 STU_ID NUMBER(10) STU_NAME VARCHAR2(100) AGE NUMBER(3) 把STU_ID为50的学生信息STU_NAME改为“张三”,下面哪条语句是正确的?
A.
UPDATE STUDENTS SET STU_NAME = 张三
B.
UPDATE FROM STUDENTS SET STU_NAME = '张三' WHERE STU_ID = 50
C.
UPDATE SET STU_NAME = '张三' FROM STUDENTS WHERE STU_ID = 50
D.
UPDATE STUDENTS SET STU_NAME = '张三' WHERE STU_ID = 50
【判断题】是进亦忧,退亦忧。然则何时而乐耶?其必曰 “ 先天下之忧而忧,后天之乐而乐 ” 乎。 进:做官退:不做官
【判断题】( )压缩气体钢瓶应避免日光或远离热源。
【简答题】The teacher complained that a majority of her students lacked the ______ (motivate) to study.