mysql - SQL 日期大于 X

Question

我正在尝试运行查询；

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

我的问题是，日期以 YYYY-MM-DD 格式存储。我只需要显示特定日期之后的数据。因此，由于 2013-12-31 是字符串而不是数字，因此运算符 > 不起作用。有什么想法吗？

Answer 1

尝试将CAST字符串转换为DATE，如下所示:

附注如果 PurchaseOrderDate 不是 DATE 数据类型，您也可以对其进行 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