如何修復 SQL 錯誤“將數據類型 varchar 轉換為數字時出錯”？

Question

我正在從 SQL Server 數據庫中選擇記錄，但結果表明查詢完成時出現錯誤，然后我得到的錯誤是

將數據類型 varchar 轉換為數字時出錯

在我的查詢中，我根據特定代碼獲取記錄，然后使用=查詢失敗但使用<>查詢運行。 任何人都可以在我做錯的地方幫助我，因為我正在尋找解決方案，前提是它們對我不起作用。

我通過下面的查詢分享

SELECT
    MAX(amount) AS amount, 
    MAX(date_of_payment) AS date_of_payment, 
    MAX(customer) AS customer, 
    MAX(payment_type) AS payment_type, 
    MAX(currency) AS currency, 
    MAX(PayCtrNum) AS PayCtrNum, 
    MAX(TRACKING_NO) AS TRACKING_NO, 
    MAX(Payment_id) AS Payment_id 
FROM 
    PAYMENTS_VW 
WHERE 
    date_of_payment = '21/01/2020' 
    AND account_code = '440342' 
GROUP BY 
    Payment_id

Answer 1

我已經使用 CAST 並將列更改為 Int 它現在正在工作。 查詢現在讀取

SELECT max(amount) as amount, 
max(date_of_payment) as date_of_payment, 
max(customer) as customer, 
max(payment_type) as payment_type, 
max(currency) as currency, 
max(PayCtrNum) as PayCtrNum, 
max(TRACKING_NO) as TRACKING_NO, 
max(Payment_id) as Payment_id 
FROM PAYMENTS_VW 
WHERE date_of_payment = '21/01/2020' 
AND CAST(account_code AS int) = '440342' 
GROUP BY Payment_id

它正在工作