MYSQL:您可以从4个表达式中提取3个匹配的结果吗? [英] MYSQL: Can you pull results that match like 3 out of 4 expressions?

问题描述

说我有一个这样的查询:

Say I have a query like this:

SELECT * FROM my_table WHERE name = "john doe" AND phone = "8183321234" AND email = "[e-mail]" AND address = "330 some lane";

但是说我只需要4个中的3个就可以匹配，我知道我可以用几个OR编写一个很长的查询，但是我想知道是否有此功能吗?

But say I only need 3 out of the 4 to match, I know I can write a very long query with several ORs but I was wondering if there was a feature for this?

谢谢.

推荐答案

SELECT
  * 
FROM 
  my_table 
WHERE 
  CASE WHEN name = "john doe"           THEN 1 ELSE 0 END +
  CASE WHEN phone = "8183321234"        THEN 1 ELSE 0 END +
  CASE WHEN email = "[e-mail]" THEN 1 ELSE 0 END +
  CASE WHEN address = "330 some lane"   THEN 1 ELSE 0 END
  >= 3;

侧面说明:这很可能无法有效地使用索引.另一方面，无论如何，这些列上都没有索引.

Side note: this will very likely not be using indexes efficiently. On the other hand, there will very likely be no indexes on these kinds of columns anyway.

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