nav[aria-label="Primary Navigation"] { padding: 0; & ul { list-style: none; width: 100%; display: flex; flex-direction: row; justify-content: start; align-items: start; gap: 30px; padding: 0; & li { margin: 0; } & ul li { list-style: none; } } }

690716_zh-CN

liliconcom

如何避免多条件匹配中缺失值为空时查询不出结果？

当连接多个匹配条件的表时，例如两个表按照USL、LSL、Nominal进行匹配，当只有上限或只有下限时，即缺少下限时，查找会为空值或者上限是缺失值，如何解决这个问题？缺失值全部替换成9999吗？

谢谢！

苹果系统

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