mysql语法根据指定条件做一个数据汇总接口

功能描述：利用mysql+php做一个php接口，根据时间dtime把状态=‘pc’和状态=‘phone’进行汇总，全部数据进行汇总，输出结果如下格式：

[
    {"dtime": "2024-12-28","pc_count": "0","phone_count": "1", "total_count":"1"},
    {"dtime": "2024-12-31","pc_count": "1","phone_count": "0", "total_count":"1"},
    {"dtime": "2025-01-02","pc_count": "1","phone_count": "0", "total_count":"1"}
]

具体实现语法如下：

$sql = 'SELECT 
    DATE(表名.dtime) AS dtime,
    SUM(CASE WHEN 表名.msg = "pc" THEN 1 ELSE 0 END) AS pc_count,
    SUM(CASE WHEN 表名.msg = "phone" THEN 1 ELSE 0 END) AS phone_count,
    SUM(CASE WHEN 表名.msg IN ("pc", "phone") THEN 1 ELSE 0 END) AS total_count
FROM 
    表名
WHERE 
    表名.mid =  "'.$id.'" AND
    表名.dtime >= DATE_SUB(CURDATE(), INTERVAL 30 DAY)
GROUP BY 
    DATE(表名.dtime)';