09 2019 档案
摘要：导入数据库--创建表空间（原数据库所在的表空间名）create tablespace 表空间名 datafile 'g:\hygy\zjgltest.dbf' size 1024M;--创建用户create user xhdc identified by hygy default tablespac
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摘要：--数据库多字段去重delete from student a where (a.no,a.name,a.science)in (select a.no,a.name,a.science from student a group by a.no,a.name,a.science having cou
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