mysql日期格式返回null

Question

我有以下SQL查詢。它爲'invoice_date'返回NULL。

SELECT * , fk_uid AS userId, fk_ivid AS invoice_uid, (

SELECT company 
FROM tbl_users 
WHERE pk_uid = userId 
) AS invoice_customer, (

SELECT DATE_FORMAT('%d/%m/%y', purchased) AS invoice_date 
FROM _invoices 
WHERE invoice_uid = invoice_uid 
LIMIT 1 
) AS invoice_date 
FROM tbl_statement_items 
WHERE statement_generated = '1' 
AND fk_statementId = '1' 
LIMIT 0 , 30 

任何幫助將appriciated。

感謝

Answer 1

你倒date_format參數順序。