调用本机函数“DATE_FORMAT”时的参数计数不正确

Question

Not sure how to fix this error

Incorrect parameter count in the call to native function 'DATE_FORMAT'

Code:

SELECT 
    id, user_id, client_name, client_phone, 
    (SELECT name
     FROM users_permissions
     WHERE users_permissions.user_id = contracts.assistant_id) AS Consultant
FROM 
    contracts
WHERE 
    contracts_statuses IN (1, 2) 
    AND transaction_type = 'rent'
    AND DATE_FORMAT('%Y-%m') > '2017-08'

Answer 1

您需要将日期列添加到date_format ，例如DATE_FORMAT(contracts.date, '%Y-%m')

Answer 2

The DATE_FORMAT() function formats a date as specified by a format mask.

syntax : DATE_FORMAT(date, format_mask)

so in this case you specifiy the date which needs to be masked with the required format. ie :'%Y-%m'