02 2021 档案
摘要:create table TABLE5 ( id INTEGER, name VARCHAR2(10) ); prompt Importing table table5... set feedback off set define off insert into table5 (ID, NAME)
阅读全文
摘要:我们通常认为A left join B后,结果集与A表的记录条数一致 但,并不是这样 with x as ( select 1 as id,90 as score from dual union all select 2 as id,80 as score from dual union all s
阅读全文