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1) ERROR 1222 (21000): The used SELECT statements have a different number of columns : 这是因为使用union的两个SQL语句产生的记录的表结构不一致. 必须是结构完全一致的记录集合才可以使用UNION. 以上就是两个表的字段不一样，导致，所以大家可以检查下。
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执行SQL报错：The used SELECT statements have a different number of columns
以上翻译：使用的SELECT语句具有不同数量的列
原因：我们在 SQL 语句中使用了 UNION 连接两张表时，查询字段数量不一致导致
# 效果展示：
我们需要将数据展示如上图所示
# 错误案例：
SELECT
a.quantity AS in_quantity,
a.price AS in_price,
(a.quantity * a.price)
