如何獲取列記錄sql中兩個日期之間的天數

Question

我有一個表partywise_account_ledger列name_of_the_customer,invoice_date和invoice_value。我想根據天數檢索invoice_value。要獲得< 5 days值我使用查詢：

select name_of_the_customer, sum(invoice_value) 
from partywise_accounts_ledger 
where datediff(d, invoice_date, '2017-04-19') < 5 
group by name_of_the_customer 

This is the Result of the Query

我怎樣才能獲得< 10 days列在單獨的語句追加到它，並說明了什麼？

謝謝！

Answer 1

使用case表達式條件聚合：

select name_of_the_customer, 
     sum(case when datediff(d, invoice_date, '2017-04-19') < 5 then invoice_value end), 
     sum(case when datediff(d, invoice_date, '2017-04-19') < 10 then invoice_value end) 
from partywise_accounts_ledger 
where datediff(d, invoice_date, '2017-04-19') < 10 
group by name_of_the_customer 

第二SUM()（對於< 10天），可作爲simplifed sum(invoice_value)。