Solutions to problems in sqlserver deleting data in tables

When appending tuples in a table with code , A statement is executed multiple times , The following results occur . When deleting manually , There are the following problems .

resolvent ：

Go back to the query page , Input

delete from Student where Sclass ='980301'

Choose this trip , Execution can be

Reopen Student surface —— Edit the first two hundred lines

notes ： A lot of times , Code has been executed , But the results were not updated , Refresh   Just go