Where is the rail service better than U.S? ()
若有关系R(A,B,C,D)和S(C,D,E),则与表达式 https://assets.asklib.com/psource/2016090910531478387.jpg 等价的SQL语句如下:SELECT(1)FROM(2)WHERE(3); 空白(1)处应选择()
若有关系R(A,B,C,D)和S(C,D,E),则与表达式 https://assets.asklib.com/psource/2016090910545055894.jpg 等价的SQL语句如下:SELECT(1)FROM(2)WHERE(3); 空白(2)处应选择()
若有关系R(A,B,C,D)和S(C,D,E),则与表达式 https://assets.asklib.com/psource/2016090910590367564.jpg 等价的SQL语句如下:SELECT(1)FROM(2)WHERE(3); 空白(3)处应选择()
1.在“学生选课”数据库中的两个关系如下。S(SNO,SNAME,SEX,AGE),SC(SNO,CNO,GRADE)则与SQL命令“SELECT SNAME FROM S WHERE SNO IN(SELECT SNO FROM SC WHERE GRADE<60)”等价的关系代数表达式是_____ 。
10. -- Where are the Class 1's students?-- The students ________ their musical play at the hall.
2. Where’s the restaurant the woman is talking about?
Where does Orwell’s humanitarian thought come from?
Where can you see the ball drop on New Year’s Eve in the U.S.? ( )
Where’s the custom trick-or-treating derived from?
有如下的SQL语句。Ⅰ. SELECT sname FROM s,sc WHERE grade<60Ⅱ. SELECT sname FROM s WHERE sno IN(SELECT sno FROM sc WHERE grade<60)Ⅲ.SELECT sname FROM s,sc WHERE s.sno=sc.sno AND grade<60若要查找分数(grade)不及格的学生姓名(sname),则以上正确的有哪些?( )
以下表达是否正确:Do you know where the nearest subway station is?你知道最近的地铁站在哪里?
以下表达是否正确:Where’s the fitting room?洗衣间在哪?
有关系 S(S#,SNAME,SAGE), C(C#,CNAME), SC(S#,C#,GRADE)。要查询选修”ACCESS”课的年龄不小20的全体学生姓名的SQL语句”SELECT SNAME FROM S,C,SC WHERE 子句”。这里的WHERE子句的内容是( )。
What’s the ship’s heading? Ship’s headingis the direction where ___
Always come early because seating is first come, first serve, always be polite, and always know where the nearest exit is in case of emergency.
有关系S(S#,SNAME,SEX),C(C#,CNAME),SC(S#,C#,GRADE)。其中S#是学生号,SNAME是学生姓名,SEX是性别,C#是课程号,CNAME是课程名称。要查询选修“数据库”课的全体男生姓名的SQL语句是SELECT SNAME FROM S,C,SC WHERE子句。这里的WHERE子句的内容是( )。
DELETE FROM S WHERE年龄>60语句的功能是______。
We can get your clients to your nearest location__________ they can buy your product. A.which B. when C. that D. where
对于基本表S(S,Name,Sex,Birthday)和SC(S,C,Grade),其中S、Name、Sex、Birthday、C和G rade分别表示学号、姓名、性别、生日、课程号和成绩。与下列SQL语句等价的关系代数式是______。 SELECT S,Name FROM S WHERE S NOT IN (SELECT S FROM SC WHERE C='c102')。
Po: uh oh~~ahhhh~~~~ ohhhhh~ What’s going on ... Where I am ... What are you 1) ... oh ... ok ... sorry ... I just wanted to see who the dragon warrior was. Wugui: How interesting tigeree: Master are
The demand and supply functions for a leading smart phone are furnished below:Q<sup>d<sub>sp= 1,000 – 20Psp+ 2I; Q<sup>s<sub>sp= –200 + 50Psp– 80W; where,Q<sup>d<sub>sp = Quantity demanded i
As the famous saying goes, “Where there’s ____, there’s a way!”()
Excuse me, where’s the bank? It’s next to the newsagent’s.()