我有两张这样的表格:
产品:id>>。
出售品编号:E.06.XI.1。
<编码>产品_id是产品中的一项外国关键产品id 表格
我写了JOIN的准备声明,如:
SELECT p.name, p.description, s.link FROM products AS p
INNER JOIN sales_sheets AS s ON p.id = s.product_id WHERE active=1 AND category=?
基本上,产品可以与人民国防军有联系,但并非所有产品都将有销售单。 因此,如果试图生产一只产品,而该产品有一张附着的销售单,它就永远不会有收益。
因此,我认为,我不得不使用LEFT OUTER JOIN取代INNER JOIN,但是,如果我把表格命名为错误的顺序,那就不会有增长? 我从未像以前一样使用过一种词汇?
SELECT p.name, p.description, s.link FROM products p
LEFT JOIN sales_sheets s ON p.id = s.product_id
WHERE active = 1 && category = ?
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