mysql where 后带 case when的查询

SELECT
	* 
FROM
	`eat_milk_every_day` 
WHERE
	ad = 10

这个是要操作的数据

SELECT
	* 
FROM
	`eat_milk_every_day` 
WHERE
	ad = 10 
AND
CASE
	
	WHEN dha = 0 THEN
	fe = 0 ELSE ca = 10 
END

这个查询的意思是：当dha = 0的时候fe = 0 否则 ca = 10，用sql翻译就是： where ad = 10 and fe = 0。或者是：where ad = 10 and ca =10。到底是拼接哪个条件呢，要看case when后的判断数据的  dha字段。