Mysql count(1) group_concat 高级用法(count 过滤条件，group_concat过滤条件)

1、官方文档：

count：COUNT(expr) [over_clause]

https://dev.mysql.com/doc/refman/8.0/en/group-by-functions.html#function_count

1.1 实例：

select update_time,sid,group_concat(if(age > ‘1‘, tid, NULL)),count(DISTINCT if(age =1,tid,null)) as current_t

from tb_s_members group by update_time,sid order by update_time desc

2、group_concat 官方文档：

GROUP_CONCAT([DISTINCT] expr [,expr ...]
             [ORDER BY {unsigned_integer | col_name | expr}
                 [ASC | DESC] [,col_name ...]]
             [SEPARATOR str_val])

https://dev.mysql.com/doc/refman/8.0/en/group-by-functions.html#function_group-concat

文章来自：https://www.cnblogs.com/cbugs/p/9340751.html