输出50～200之间的所有素数，一行显示5个，并求和。
set talk off
clear
n=50
j=0
S=0
______
i=2
do while i＜n
if int(n/i)=n/i
exit
endif
______
enddo
ifi＞=n
str(n,5)
S=S+N
j=j+l
______

endif
endif
n=n+1
enddo
"S=",S
return

A．SELECT 姓名，COUNT(*) AS 外币种类 FROM 持有数
GROUP BY 姓名 HAVING COUNT(*)＞=4
ORDER BY 外币种类，姓名 DESC
B．SELECT 姓名，COUNT(*) AS 外币种类 FROM 持有数
GROUP BY 姓名 HAVING COUNT(*)＞=4
ORDER BY COUNT(*)，姓名 DESC
C．SELECT 姓名，COUNT(*) AS 外币种类 FROM 持有数
GROUP BY 姓名 HAVING COUNT(*)＞=4
ORDER BY 外币种类 AND 姓名 DESC
D．SELECT 姓名，COUNT(*) AS 外币种类 FROM 持有数
GROUP BY 姓名 HAVING COUNT(*)＞=4
ORDER BY 外币种类+姓名 DESC