mysql中选择的图像数量较少的记录数

Question

我有两张表有列表图片。我想获得少于三张图片的列表数量。这是我的查询，但它无法正常工作。

select 
    @table1_pic:=(select 
            count(i.id)
        from
            crm_rentals_images as i,
            crm_rentals as r
        where
            r.id = i.rentals_id and r.status = 2
                and r.is_archive = 0
                and r.is_active = 1
        group by i.rentals_id
        HAVING COUNT(*) < 3) as pic_rentals,
    @table2_pic:=(select 
            count(i.id)
        from
            crm_sales_images as i,
            crm_sales as r
        where
            r.id = i.rentals_id and r.status = 2
                and r.is_archive = 0
                and r.is_active = 1
        group by i.rentals_id
        HAVING COUNT(*) < 3) as ppic_sales,
    (@table1_pic + @table2_pic) as tot_img

这给我错误

Subquery returns more than 1 row

注意：我想得到每个的总数，然后是两者的总和