1. select语句怎么写
关于select语句的书写,了解执行顺序很有必要,用下面的例子做介绍:select from where group by having order by 中,首先执行的是from后的语句,说明数据的来源;-->执行where后的语句,对记录进行初步筛选;-->执行group by后的语句,对初步筛选后剩下的字段进行分组;-->执行having后的语句,对分组后的记录进行二次筛选;-->执行select后的语句,在二次筛选后的字段中进行选择并显示出来;-->执行order by后的语句,对select 后的字段进行排序。
2. select语句怎么写
关于select语句的书写,了解执行顺序很有必要,用下面的例子做介绍:
select from where group by having order by 中,
首先执行的是from后的语句,说明数据的来源;
-->执行where后的语句,对记录进行初步筛选;
-->执行group by后的语句,对初步筛选后剩下的字段进行分组;
-->执行having后的语句,对分组后的记录进行二次筛选;
-->执行select后的语句,在二次筛选后的字段中进行选择并显示出来;
-->执行order by后的语句,对select 后的字段进行排序。
3. 这个select 语句要怎么写
如果你想计算每日的订单总额应该是:
sql="select Date,sum(TotalPrice) as Total_Price from Statistics where Date between #" & FirstDate & "# And #" & EndDate & "# and Factory='"&Factory&"' group by Date order by Date desc"
如果你想要更多新信息:
sql="select Pono,Date,Style,Customer,Factory,sum(TotalPrice) as Total_Price from Statistics where Date between #" & FirstDate & "# And #" & EndDate & "# and Factory='"&Factory&"' group by Pono,Date,Style,Customer,Factory,id order by id desc"
select后非聚集运算Column必须出现在group by后。
4. 怎么写select语句能取到这两种结果
1,行列切换
select a.name,
max(case a.date when b.date then asset else '' end) assert
from table1 a,(select distinct(date) from table1) b
where a.name = b.name
group by a.name2,
select * from table1 a
left join table2 b
on a.name = b.name and a.assert = b.assert
order by date desc
limit 1