获取使用的select语句具有不同的列数

Question

如何在单个表中获取此查询的输出

bool setLess(const MySet &, const MySet &)

Answer 1

看看这是否适合您。只需添加您自己的ON条件而不是我的biocard.pk = inventory_listing.fk。我不知道在桌子上加入什么。

SELECT
    common_name,
    category,
    size,
    container,
    flower_image,
    price,
    bio_Count.total_quantity
FROM 
    biocard join inventory_listing
ON
    biocard.pk = inventory_listing.fk LEFT JOIN (SELECT
                                                    common_name,
                                                    count(*) as total_quantity 
                                                FROM
                                                    biocard 
                                                GROUP BY 
                                                    common_name) bio_Count
ON
    bio_Count.common_name = biocard.common_name