mysql date-format返回null

Question

我有以下SQL查询。它为'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

任何帮助都会得到满足。

由于

Answer 1

您已经反转了date_format个参数。