我們如何「排序」篩選訂單

Question

我們可以通過在in條款中注入的ID對訂購的SQL查詢執行什麼操作？

，如：

select oh.orderID, oh.orderType, oh.state, oh.orderDateTime 
from orderHeaders oh 
where oh.orderID in (
47185154, 
47185121, 
47184971, 
47863101) 

我orderID場就這樣產生：

47184971... 
47863101... 
47185121... 
47185154... 

怎樣才能得到結果由WHERE IN (...)過濾排序的條目排序？

Answer 1

順序定義它們可以使用field()：

select oh.orderID, oh.orderType, oh.state, oh.orderDateTime 
from orderHeaders oh 
where oh.orderID in (47185154, 47185121, 47184971, 47863101) 
order by field(oh.orderID, 47185154, 47185121, 47184971, 47863101); 

Answer 2

您可以通過子句

ORDER BY 
CASE oh.OrderID 
WHEN '47185154' THEN 1 
WHEN '47185121' THEN 2 
WHEN '47184971' THEN 3 
WHEN '47863101' THEN 4 
ELSE 5 
END