MySql如何按照日期进行分组统计

CREATE TABLE `tb_count`  (
  `id` int(20) NOT NULL AUTO_INCREMENT COMMENT '编号',
  `tiems` datetime(0) NOT NULL COMMENT '日期',
  `number` varchar(11) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '手机号',
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 18 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

SELECT COUNT(*) AS counts,DATE_FORMAT(tiems,"%Y年%m月%d日") AS dates FROM tb_count  GROUP BY DATE_FORMAT (tiems,"%Y年%m月%d日")
-- DATE_FORMAT();按照格式对某个日期操作,
-- tb_count 表名
-- period 日期
-- 整段代码的意思是：从tb_count表中 查询日期（period ）（将日期按照"%Y年%m月"格式）并作为dates，统计数量（count(*)）,按照日期分组 GROUP BY DATE_FORMAT(period ,"%Y年%m月")

@ApiModel(description = "Statis",value = "Statis")
public class Statis implements Serializable {
    //数量
    @ApiModelProperty(value = "",required = false)
    private int counts;
    //时间
    @ApiModelProperty(value = "",required = false)
    private String dates;
    public int getCounts() {
        return counts;
    }
    public void setCounts(int counts) {
        this.counts = counts;
    }
    public String getDates() {
        return dates;
    }
    public void setDates(String dates) {
        this.dates = dates;
    }
}

  /**
     * 分页查询
     * @param page 当前页
     * @param size 每页显示的条数
     * @return
     */
    Result findPage(int page,int size);

  /**
     * 分页查询
     * @param page 当前页
     * @param size 每页显示的条数
     * @return
     */
    @Override
    public Result findPage(int page, int size) {
        try {
            //分页查询
            PageHelper.startPage(page, size);
            //查询所有
            List<Statis> statisList = countsMapper.findAll();
            PageInfo<Statis> pageInfo = new PageInfo<Statis>(statisList);
            return new Result(true,StatusCode.OK,"分页查询成功",pageInfo);
        }catch (Exception e){
            e.printStackTrace();
            return  new Result(false,StatusCode.ERROR,"分页查询失败");
        }
    }

    /**
     * 分页查询
     * @param page 当前页
     * @param size 每页显示的条数
     * @return
     * @throws Exception
     */
    @GetMapping("/search/{page}/{size}")
    @ApiImplicitParams({
            @ApiImplicitParam(paramType = "path", name = "page", value = "当前页", required = true, dataType = "Integer"),
            @ApiImplicitParam(paramType = "path", name = "size", value = "每页显示条数", required = true, dataType = "Integer")
    })
    @ApiOperation(value = "日期分页查询",notes = "日期分页方法详情",tags = {"MemberController"})
    public Result findPage(@PathVariable int page,@PathVariable int size) throws Exception {
      return   countsService.findPage(page, size);
    }