1.DDL数据定义语言(Data Definiton Language)用于create 和alter Schema。
2.DML数据操作语言(Data manipulation
Language)用于操作和获取数据,insertion,update,deletion,,,,.
sql书
sql tuning,anintroduction to database system
http://www.mathcomp.uokufa.edu.iq/staff/kbs/file/2/An%20Introduction%20to%20Database%20Systems,%208th%20Edition,%20C%20J%20Date_4.pdf
时间: 2024-10-09 22:03:27