任何人都可以帮助我将这个SQL语句转换成MySQL,因为当我试图从MySQL运行它时出现语法错误。从SQL到MySQL的查询
SELECT
a.userid,
CAST(a.checktime AS VARCHAR) AS timein,
ISNULL(CAST(b.checktime AS VARCHAR),'NO TIMEOUT') AS timeout
FROM timein a
LEFT JOIN timeout b ON a.userid = b.userid
WHERE ISNULL(CAST(b.checktime),'NO TIMEOUT') = 'NO TIMEOUT'
更换'ISNULL'通过'IFNULL' – 1000111
添加错误消息请 – Jens