请说出该程序段的功能。 declare @e numeric（5,2)declare @ c1 int,@ c2 int,@ c3 int,@ c4 intse

请说出该程序段的功能。

declare @e numeric(5,2)

declare @ c1 int, @ c2 int, @ c3 int, @ c4 int

set @ c1=0; set @ c2 =0; set @ c3=0; set @ c4=0

declare xxx cursor

for select 成绩 from score

open xxx

fetch xxx into @ c

while @'@ fetch_status = 0

begin

if(@c ＞ =90) set @cl =@ e1 +1;

else if(@ c ＞ =70) set @ c2 =@ c2 +1;

else if(@ c＞ =60) set @ c3 =@ c3 +1;

else set @ c4 = @ c4 + 1

fetch from xxx into @ c

end

close xxx

deallocate xxx

print 优秀生人数：'+sb(@ c1，5)；

print食好生人数：'+str(@ c2，5)；

print及格生人数：'+str(@ c3，5)；

print及格生人数：'+sh(@ c4，5)