Good comrades, my little brother is working on a small examination system.

guo8488

Know how many questions to read

maggic

The practice of random ID. If the ID is continuous, it is constantly taking random numbers-of course, it cannot be repeated.
Discontinuity, that is, take the record number

思念的味道

select top 1 * from YourTable order by NEWID

思念的味道

Connected:
 You also need to filter out the used question numbers