日期之間的SQL語法

Question

我有一個查詢需要返回ShipDate在日期範圍之間的記錄。下面的查詢工作：

$query = "SELECT ECCustomerOrder.ShipDate, 
ECCustomers.Customer, 
ECCustomerOrder.PO, 
ECCustomerOrder.TotalCases, 
ECCustomerOrder.order_number 
FROM ECCustomerOrder INNER JOIN ECCustomers ON ECCustomerOrder.ID = ECCustomers.ID 
WHERE ECCustomerOrder.ShipDate >= $todayMinus"; 

$ todayMinus是一個PHP變量早些時候在接受當前日期減去15天腳本設置。我不能去工作如下：

$query = "SELECT ECCustomerOrder.ShipDate, 
ECCustomers.Customer, 
ECCustomerOrder.PO, 
ECCustomerOrder.TotalCases, 
ECCustomerOrder.order_number 
FROM ECCustomerOrder INNER JOIN ECCustomers ON ECCustomerOrder.ID = ECCustomers.ID 
WHERE ECCustomerOrder.ShipDate BETWEEN $todayMinus AND $todayPlus"; 

，這是什麼SQL查詢的正確語法爲$ todayMinus和$ todayPlus的ShipDates之間返回記錄？

Answer 1

假設您使用的是明碼日期，您必須引用它們。

例如

ShipDate BETWEEN 2013-01-01 AND 2013-02-19 

是不正確的，因爲2013-01-01是減法，你實際上是在做

ShipDate BETWEEN 2011 AND 1992 

嘗試

ShipDate BETWEEN '$todayMinus' AND '$todayPlus'