SQL日期大於X

Question

我正在嘗試運行查詢；

SELECT PO_PurchaseOrderDetail.ItemCodeDesc,   
       PO_PurchaseOrderDetail.QuantityOrdered, 
       PO_PurchaseOrderDetail.QuantityReceived, 
        PO_PurchaseOrderDetail.UnitCost, 
       PO_PurchaseOrderDetail.JT158_WTSalesOrderNo, 
       PO_PurchaseOrderDetail.PurchaseOrderNo, 
       PO_PurchaseOrderHeader.PurchaseName, 
       PO_PurchaseOrderHeader.PurchaseOrderDate
FROM PO_PurchaseOrderDetail PO_PurchaseOrderDetail, PO_PurchaseOrderHeader PO_PurchaseOrderHeader
WHERE (PO_PurchaseOrderDetail.PurchaseOrderNo=PO_PurchaseOrderHeader.PurchaseOrderNo) 
AND ***(PO_PurchaseOrderHeader.PurchaseOrderDate > '2013-12-31')***
ORDER BY PO_PurchaseOrderDetail.JT158_WTSalesOrderNo, PO_PurchaseOrderDetail.PurchaseOrderNo

我的問題是，日期以YYYY-MM-DD格式存儲。 我只需要顯示特定日期之后的數據即可。 因此，由於2013-12-31是字符串而不是數字，因此運算符>不起作用。 有任何想法嗎？

Answer 1

嘗試在以下內容中將字符串CAST作為DATE ：

PS，如果PurchaseOrderDate不是DATE數據類型，則您也可以CAST： CAST(PO_PurchaseOrderHeader.PurchaseOrderDate AS DATE)

SELECT PO_PurchaseOrderDetail.ItemCodeDesc,
       PO_PurchaseOrderDetail.QuantityOrdered,
       PO_PurchaseOrderDetail.QuantityReceived, 
       PO_PurchaseOrderDetail.UnitCost, 
       PO_PurchaseOrderDetail.JT158_WTSalesOrderNo, 
       PO_PurchaseOrderDetail.PurchaseOrderNo, 
       PO_PurchaseOrderHeader.PurchaseName, 
       PO_PurchaseOrderHeader.PurchaseOrderDate
FROM   PO_PurchaseOrderDetail PO_PurchaseOrderDetail, 
       PO_PurchaseOrderHeader PO_PurchaseOrderHeader
WHERE  PO_PurchaseOrderDetail.PurchaseOrderNo = PO_PurchaseOrderHeader.PurchaseOrderNo AND    
       PO_PurchaseOrderHeader.PurchaseOrderDate > CAST('2013-12-31' AS DATE)
ORDER BY PO_PurchaseOrderDetail.JT158_WTSalesOrderNo, 
         PO_PurchaseOrderDetail.PurchaseOrderNo