MYSQL 判断字段中指定字符出现的次数

select   *, length(advName)-length(replace(advName, '详情', ''))  from   product_advertisement   

select   *, length(advName)-length(replace(advName, '详情', ''))  from   product_advertisement    

where length(advName)-length(replace(advName, '详情', '')) =6