Grafana MySQL查询错误分析间隔'％Y-％m-％d'

Question

使用Grafana如下查询MySQL将得到错误“错误分析间隔'％Y-％m-％d”。哪个datatime是日期字符串，例如“ 2019-12-12”，“ 2019-12-13”。

SELECT
  $__timeGroupAlias(UNIX_TIMESTAMP(STR_TO_DATE(datatime, '%Y-%m-%d')),$__interval),
  count(dept_id) AS "dept_id"
FROM dm_dept_sales_d
WHERE
  $__timeFilter(UNIX_TIMESTAMP(STR_TO_DATE(datatime, '%Y-%m-%d')))
GROUP BY 1
ORDER BY $__timeGroup(UNIX_TIMESTAMP(STR_TO_DATE(datatime, '%Y-%m-%d')),$__interval)

我该如何进行？