创建一个虚拟SQL表，然后插入数据

Question

我正在尝试创建一个临时表，然后插入一个查询来替换该虚拟表中的数据。

在插入新数据之前，我想要为最终虚拟表获取的内容如下所示：

Year    MonthNum  Month Application ResourceClass   UptimePercent

2013    1     Jan   Service1    Enterprise Service  1
2013    2     Feb   Service1    Enterprise Service  1
2013    3     Mar   Service1    Enterprise Service  1
2013    4     Apr   Service1    Enterprise Service  1
2013    5     May   Service1    Enterprise Service  1
2013    6     Jun   Service1    Enterprise Service  1
2013    7     Jul   Service1    Enterprise Service  1
2013    8     Aug   Service1    Enterprise Service  1
2013    9     Sep   Service1    Enterprise Service  1
2013    10    Oct   Service1    Enterprise Service  1
2013    11    Nov   Service1    Enterprise Service  1
2013    12    Dec   Service1    Enterprise Service  1
2013    1     Jan   Service2    Enterprise Service  1
2013    2     Feb   Service2    Enterprise Service  1
2013    3     Mar   Service2    Enterprise Service  1
2013    4     Apr   Service2    Enterprise Service  1
2013    5     May   Service2    Enterprise Service  1
2013    6     Jun   Service2    Enterprise Service  1
2013    7     Jul   Service2    Enterprise Service  1
2013    8     Aug   Service2    Enterprise Service  1
2013    9     Sep   Service2    Enterprise Service  1
2013    10    Oct   Service2    Enterprise Service  1
2013    11    Nov   Service2    Enterprise Service  1
2013    12    Dec   Service2    Enterprise Service  1
2013    1     Jan   Service3    Enterprise Service  1
2013    2     Feb   Service3    Enterprise Service  1
2013    3     Mar   Service3    Enterprise Service  1
2013    4     Apr   Service3    Enterprise Service  1
2013    5     May   Service3    Enterprise Service  1
2013    6     Jun   Service3    Enterprise Service  1
2013    7     Jul   Service3    Enterprise Service  1
2013    8     Aug   Service3    Enterprise Service  1
2013    9     Sep   Service3    Enterprise Service  1
2013    10    Oct   Service3    Enterprise Service  1
2013    11    Nov   Service3    Enterprise Service  1
2013    12    Dec   Service3    Enterprise Service  1

是否有人有一个很好的方法来引入与应用程序分开的日期部分，以及UptimePercent？我不能为我的生活找到决心。

Answer 1

是否有人有一个很好的方法来引入与应用程序分开的日期部分，以及UptimePercent？

是。你可以这样做：

create newtable like oldtable;

无论如何，create like将适用于MySQL。然后：

insert into newtable (Year, MonthNum, Month, UptimePercent) select 
Year, MonthNum, Month, UptimePercent from oldtable;