关于 SQL 服务器中同一列的除法结果问题

Question

我正在尝试在 SQL 服务器中编写语句。我想要做的是获取以“R”结尾的列中计数记录的结果除以所有记录的计数。所以它基本上是一个列的语句，其中有一个语句“count (invoice) where Invoice like "%R" / count( Invoice)"

这是我的代码，没有除法计算。我只是想出了没有除法计算的语句。

SELECT 
    Invoice,
    COUNT(ART_CURRENT__TRANSACTION.Invoice) AS Number_Revisions,
    MAX(ART_CURRENT__TRANSACTION.[Customer]) AS "Customer",
    MAX(ARM_MASTER__CUSTOMER.Name) AS "Name",
    MAX(ART_CURRENT__TRANSACTION.[Job]) AS Job
FROM 
    ART_CURRENT__TRANSACTION
LEFT OUTER JOIN 
    ARM_MASTER__CUSTOMER ON ARM_MASTER__CUSTOMER.Customer = ART_CURRENT__TRANSACTION.Customer
WHERE
    Invoice LIKE '%R'
GROUP BY
    Invoice;

我想问的是如何添加一个列来计算以“R”结尾的发票数量/发票数量。

谢谢大家！

Answer 1

What I am trying to do is to get the result of count records in Columns end with "R" divide the count of all the records.

您似乎需要这样的计算：

SELECT AVG(CASE WHEN t.Invoice LIKE '%R' THEN 1.0 ELSE 0 END)
FROM ART_CURRENT__TRANSACTION t;

这假设 invoice 在事务 table 中。我认为你想做的事情不需要加入。

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