摘要:
Clustered Index: Clustered index defines the way in which data is ordered physically on the disk. And there can only be one way in which you can order... 阅读全文
该文被密码保护。 阅读全文
摘要:
exists(sql 返回结果集为真)notexists(sql 不返回结果集为真)如下:表AID NAME1 A12 A23 A3表BID AID NAME11B122B232B3表A和表B是1对多的关系 A.ID=>B.AIDSELECTID,NAMEFROMAWHEREEXIST (SELEC... 阅读全文