带有SQL查询的DateDiff

我想知道是否有人能够指出以下代码的问题。特别是dateDiff部分。我想做的是找出发送发票和存款日期之间的差异（以天为单位）。如果存款日期为空，我想使用今天的日期。很简单，我想

$rs = mysql_query("SELECT i.dateSent
    , i.dateDeposit
    , i.invoiceID
    , i.gstValue
    , i.invoiceValue AS invoiceTotal
    , p.projectValue
    , i.invoiceNumber
    , p.projectName
    , p.projectNumber
    , p.projectID
    , c.clientName
    , c.clientCode
    , c.clientID
    , DATEDIFF(i.dateSent, CASE WHEN i.dateDeposit IS Null Then GetDate() ELSE i.dateDeposit) as numbDays

FROM cms_invoices i

LEFT JOIN cms_projects p ON p.projectID = i.projectID
LEFT JOIN cms_clients c ON p.clientID = c.clientID

ORDER BY i.dateDeposit ASC, c.clientName ASC
");

在这个阶段，结果是没有结果的。dateDiff行中断查询。Arg

谢谢，

---

@rrFive

似乎您缺少了一个

结尾

：

... DATEDIFF(i.dateSent, 
    CASE
        WHEN i.dateDeposit IS NULL
            THEN GetDate()
        ELSE i.dateDeposit
     END) AS numbDays