百度试题 结果1 题目merge函数常用参数中,_是用于连接的列名。A. left B. how C. on D. sort 相关知识点: 试题来源: 解析 C 反馈 收藏
3:inner join def:An inner join combines and displays only the rows from the first table that match rows from the second table, based on the matching criteria (内连接只会对两表中基于准则的行进行组合和显示),In an inner join, a WHERE clause is added to restrict the rows of the Cartesian ...
2009-12-28 16:51 −inner join on,full outer join,left join on,right jion on1.inner join on 内部连接 两表都满足的组合2.full outer 全连 两表相同的组合在一起,A表有,B表没有的数据(显示为null),同样B表有,A表没有的... _eagle ...
based on the matching criteria (内连接只会对两表中基于准则的行进行组合和显示),In an inner join, a WHERE clause is added to restrict the rows of the Cartesian product that will be displayed in output. (在内连接中,where从句是限制在笛卡尔输出集中显示的行的数量)...