and 1=(select top 1 count(*) from admin where Asc(mid (username,1))=97)这种的。还有left、right神马的。
参考一下吧
https://hi.baidu.com/yjppudydvncilte/item/185019d4ab2ed0e8ca0c3922
© ID1536264 | Powered by LOFTER