第17讲++T-SQL流程控制语句

use    xscj
declare    @xm    varchar(10)
if   (select  avg(成绩)  from  xs_kc  where   学号= ‘2012130101’ ) > 85
       begin
            select  @xm= 姓名  from  xsqk  where  学号= ‘2012130101’ 
          print      @xm + ‘考出了高分‘
        end
    else
            print    ‘考得一般‘

declare  @i    int,  @sum   int
select   @i = 1, @sum = 0
while    @i < 100 
           begin
                 set   @sum = @sum + @i
                 set   @i = @i +2
           end
print   ‘奇数和为：‘+ str(@sum)

waitfor  delay   ’00:00:06’
use  xscj
select  *   from   xsqk
go
waitfor  time   ’16:15:30’
use  xscj
select  *   from   xs_kc