我有三个不同的表格,我在这里存储用户的余额。所以我需要的是根据日期对他的余额进行适当的陈述。 是否有可能获得三个不同的表上的值,并根据日期显示它们? 如:从多个表获取数据并按日期显示它们
Table 1
Member = member 1
date = 1 JULY 2016
Amount = 2000
Table 2
Member = member 1
date = 5 JULY 2016
Amount = 5000
Table 3
Member = member 1
date = 10 JULY 2016
Amount = 10000
So the output should be:
Member Date Amount
Member 1 01/07/2016 2000
Member 1 05/07/2016 5000
Member 1 10/07/2016 10000
是否每个“成员”都保证在每个表中都有一行?是否有会员可能会在所有3张桌子中失踪?你能用某种模式定义来改进问题吗? –