u011559205的专栏

drop proc up_PC_insert go create proc up_PC_insert @model smallint, @speed real, @ram smallint, @hd smallint, @price smallint as while 1 = 1 begin begin try insert into PC(model, speed,

1.数据操纵语言DML(Data Manipulation Language):包括检索()和更新()语句

1.表中每一行在其存储的数据文件中

select * from (SELECT ROWID, ROWNUM R,ENAME FROM EMP WHERE SAL>2000) where 3

1.以大小写敏感的方式应用表名,列名

1.oracle中连接(join)分为内连接和外连接，而外连接又分为