從SQL查詢返回特定數據，錯誤列名無效

Question

下面的SQL查詢返回我需要的數據，但是對於組織返回“付款狀態”，“待付款”和“已付款”表列，我希望為公司而不是以上返回“付款狀態”（已付款/未付款） 。

我以為這可能是where子句，其中付款狀態僅等於“已付款”和“未付款”，因此我試圖這樣做，但出現了錯誤

無效的列名Payment_Status

請告知我如何僅顯示付款狀態（已付款/未付款）

SELECT        
    Account.mm_registrationnumber AS CL_Reg_Number, 
    Account.Name, 
    Account.mm_supplierstatus AS Supplier_Status, 
    Account.PrimaryContactIdName AS Primary_Contact, 
    Account.EMailAddress1 AS Email, 
    Account.Telephone1 AS Telephone, 
    mm_address.mm_line1 AS Line1, 
    mm_address.mm_line2 AS Line2, 
    mm_address.mm_line3 AS Line3, 
    mm_address.mm_line4 AS Line4, 
    mm_address.mm_city AS City, 
    mm_address.mm_county AS County, 
    mm_address.mm_postcode AS Postcode, 
    mm_turnover.mm_name AS Signup_Turnover, 
    Account.mm_signupdate AS SignUp_Date, 
    mm_payment.mm_paymenttype AS Payment_Type, 
    mm_payment.mm_paymentstatus AS Payment_Status, 
    mm_payment.mm_vatamount AS Payment_Amount_VAT, 
    mm_payment.mm_paymentamount AS Payment_Amount_Net, 
    Invoice.InvoiceNumber AS Invoice_ID, 
    Invoice.DueDate AS Due_Date, 
    Invoice.CreatedOn AS Created_Date
FROM  
    Account 
INNER JOIN 
    mm_payment ON mm_payment.mm_organisation = Account.AccountId 
INNER JOIN 
    mm_address ON Account.mm_address = mm_address.mm_addressId 
INNER JOIN 
    mm_turnover ON Account.mm_turnover = mm_turnover.mm_turnoverId 
INNER JOIN 
    Invoice ON Invoice.AccountId = Account.AccountId
WHERE 
    Payment_Status = 'Paid'; //  error 'invalid column name Payment_Status'

Answer 1

您的問題是您在WHERE子句中引用了列別名，而不是列本身。 嘗試這個：

SELECT        Account.mm_registrationnumber AS CL_Reg_Number, Account.Name, Account.mm_supplierstatus AS Supplier_Status, 
                     Account.PrimaryContactIdName AS Primary_Contact, Account.EMailAddress1 AS Email, Account.Telephone1 AS Telephone, mm_address.mm_line1 AS Line1, 
                     mm_address.mm_line2 AS Line2, mm_address.mm_line3 AS Line3, mm_address.mm_line4 AS Line4, mm_address.mm_city AS City, 
                     mm_address.mm_county AS County, mm_address.mm_postcode AS Postcode, mm_turnover.mm_name AS Signup_Turnover, Account.mm_signupdate AS SignUp_Date, 
                     mm_payment.mm_paymenttype AS Payment_Type, mm_payment.mm_paymentstatus AS Payment_Status, mm_payment.mm_vatamount AS Payment_Amount_VAT, 
                     mm_payment.mm_paymentamount AS Payment_Amount_Net, Invoice.InvoiceNumber AS Invoice_ID, Invoice.DueDate AS Due_Date, 
                     Invoice.CreatedOn AS Created_Date

FROM            Account INNER JOIN
                     mm_payment ON mm_payment.mm_organisation = Account.AccountId INNER JOIN
                     mm_address ON Account.mm_address = mm_address.mm_addressId INNER JOIN
                     mm_turnover ON Account.mm_turnover = mm_turnover.mm_turnoverId INNER JOIN
                     Invoice ON Invoice.AccountId = Account.AccountId

WHERE mm_payment.mm_paymentstatus = 'Paid'; //  error 'invalid column name Payment_Status'

我還將您的表名添加到該列中以進行澄清。 這也將解決任何聯接表中具有相同列名的潛在問題。

編輯：如果mm_paymentstatus是整數或位，請嘗試此操作，假設1為“已付費”：

WHERE mm_payment.mm_paymentstatus = 1

Answer 2

請使用WHERE [付款狀態]，因為列名中有空格。 所以你需要使用[]