如果任何组合匹配，MySQL将显示结果

假设用户有一个搜索表单，在其中搜索属性。假设他选择：

Location : ABC Price Range : 1 million - 5 millions No. of Bedrooms Range : 5 - 12 State : XYZ County : PQR Category: MNO 匹配他选择的所有字段以从数据库生成结果的可能性非常小。所以在这里使用和在条件似乎不有效的地方。我想要的是-

如果所有选择都匹配，则没有问题显示结果 如果位置、价格范围、状态匹配，则也显示结果 如果位置、卧室数量、类别、状态匹配，则也显示结果 以此类推……如果任何组合匹配，则显示结果

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您可能希望在WHERE子句中设置许多条件

WHERE (Location AND price AND Bedrooms AND State AND County AND Category)
OR (Location AND Price AND State)
OR (Location AND Bedrooms AND Category AND State)
OR (...)
...

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这允许任何您希望有效的数据组合返回数据。

您希望在WHERE子句中设置许多条件

WHERE (Location AND price AND Bedrooms AND State AND County AND Category)
OR (Location AND Price AND State)
OR (Location AND Bedrooms AND Category AND State)
OR (...)
...

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这允许任何您希望有效的数据组合返回数据。

如何筛选表中与任何搜索项匹配的记录，并按匹配项的数量降序排列结果：

SELECT   *,
         (Location = 'ABC')
       + (Price BETWEEN 1000000 AND 5000000)
       + (Bedrooms BETWEEN 5 AND 12)
       + (State = 'XYZ')
       + (County = 'PQR')
       + (Category = 'MNO')
           AS relevance
FROM     my_table
WHERE    (Location = 'ABC')
      OR (Price BETWEEN 1000000 AND 5000000)
      OR (Bedrooms BETWEEN 5 AND 12)
      OR (State = 'XYZ')
      OR (County = 'PQR')
      OR (Category = 'MNO')
HAVING   relevance >= ?   -- specify the minimum number of matching terms here
ORDER BY relevance DESC
LIMIT    ?                -- specify the maximum number of matching records here

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如何筛选表中与任何搜索项匹配的记录，并按匹配项的数量降序排列结果：

SELECT   *,
         (Location = 'ABC')
       + (Price BETWEEN 1000000 AND 5000000)
       + (Bedrooms BETWEEN 5 AND 12)
       + (State = 'XYZ')
       + (County = 'PQR')
       + (Category = 'MNO')
           AS relevance
FROM     my_table
WHERE    (Location = 'ABC')
      OR (Price BETWEEN 1000000 AND 5000000)
      OR (Bedrooms BETWEEN 5 AND 12)
      OR (State = 'XYZ')
      OR (County = 'PQR')
      OR (Category = 'MNO')
HAVING   relevance >= ?   -- specify the minimum number of matching terms here
ORDER BY relevance DESC
LIMIT    ?                -- specify the maximum number of matching records here

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类似于eggyals的解决方案，但只是为了恢复您关心的行。未测试，请原谅任何打字错误：-

SELECT Sub2.*
FROM (SELECT MAX(
CASE WHEN Location = 'ABC' THEN 1 ELSE 0 END +
CASE WHEN Price BETWEEN 1000000 AND 5000000 THEN 1 ELSE 0 END +
CASE WHEN Bedrooms BETWEEN 5 AND 12 THEN 1 ELSE 0 END +
CASE WHEN State = 'XYZ' THEN 1 ELSE 0 END +
CASE WHEN County = 'PQR' THEN 1 ELSE 0 END +
CASE WHEN Category = 'MNO' THEN 1 ELSE 0 END) AS MatchCount
FROM     my_table a
WHERE    (Location = 'ABC')
      OR (Price BETWEEN 1000000 AND 5000000)
      OR (Bedrooms BETWEEN 5 AND 12)
      OR (State = 'XYZ')
      OR (County = 'PQR')
      OR (Category = 'MNO'))Sub1
INNER JOIN (SELECT a.*,
CASE WHEN Location = 'ABC' THEN 1 ELSE 0 END +
CASE WHEN Price BETWEEN 1000000 AND 5000000 THEN 1 ELSE 0 END +
CASE WHEN Bedrooms BETWEEN 5 AND 12 THEN 1 ELSE 0 END +
CASE WHEN State = 'XYZ' THEN 1 ELSE 0 END +
CASE WHEN County = 'PQR' THEN 1 ELSE 0 END +
CASE WHEN Category = 'MNO' THEN 1 ELSE 0 END AS MatchCount
FROM     my_table a
WHERE    (Location = 'ABC')
      OR (Price BETWEEN 1000000 AND 5000000)
      OR (Bedrooms BETWEEN 5 AND 12)
      OR (State = 'XYZ')
      OR (County = 'PQR')
      OR (Category = 'MNO')) Sub2
ON Sub1.MatchCount = Sub2.MatchCount

---

类似于eggyals的解决方案，但只是为了恢复您关心的行。未测试，请原谅任何打字错误：-

SELECT Sub2.*
FROM (SELECT MAX(
CASE WHEN Location = 'ABC' THEN 1 ELSE 0 END +
CASE WHEN Price BETWEEN 1000000 AND 5000000 THEN 1 ELSE 0 END +
CASE WHEN Bedrooms BETWEEN 5 AND 12 THEN 1 ELSE 0 END +
CASE WHEN State = 'XYZ' THEN 1 ELSE 0 END +
CASE WHEN County = 'PQR' THEN 1 ELSE 0 END +
CASE WHEN Category = 'MNO' THEN 1 ELSE 0 END) AS MatchCount
FROM     my_table a
WHERE    (Location = 'ABC')
      OR (Price BETWEEN 1000000 AND 5000000)
      OR (Bedrooms BETWEEN 5 AND 12)
      OR (State = 'XYZ')
      OR (County = 'PQR')
      OR (Category = 'MNO'))Sub1
INNER JOIN (SELECT a.*,
CASE WHEN Location = 'ABC' THEN 1 ELSE 0 END +
CASE WHEN Price BETWEEN 1000000 AND 5000000 THEN 1 ELSE 0 END +
CASE WHEN Bedrooms BETWEEN 5 AND 12 THEN 1 ELSE 0 END +
CASE WHEN State = 'XYZ' THEN 1 ELSE 0 END +
CASE WHEN County = 'PQR' THEN 1 ELSE 0 END +
CASE WHEN Category = 'MNO' THEN 1 ELSE 0 END AS MatchCount
FROM     my_table a
WHERE    (Location = 'ABC')
      OR (Price BETWEEN 1000000 AND 5000000)
      OR (Bedrooms BETWEEN 5 AND 12)
      OR (State = 'XYZ')
      OR (County = 'PQR')
      OR (Category = 'MNO')) Sub2
ON Sub1.MatchCount = Sub2.MatchCount

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我试过这个，它几乎产生了所有的记录。总共大约有883条记录，查询返回了858条记录，这看起来很不错irrelevant@Sharmila：您可以添加HAVING子句，将结果限制为仅匹配n个以上项的结果，和/或添加LIMIT子句，将结果限制为最佳n个匹配项。更易于阅读和维护，总的来说，比其他答案要干净得多，你得到了我的选票@eggyal，谢谢你的帮助。但它仍然不起作用，无论我在搜索表单中选择什么，它只给出相同的14个结果。我尝试了这个，它几乎产生了所有记录。总共大约有883条记录，查询返回了858条记录，这看起来很不错irrelevant@Sharmila：您可以添加HAVING子句，将结果限制为仅匹配n个以上项的结果，和/或添加LIMIT子句，将结果限制为最佳n个匹配项。更易于阅读和维护，总的来说，比其他答案要干净得多，你得到了我的选票@eggyal，谢谢你的帮助。但它仍然不起作用，无论我在搜索表单中选择什么，它只会给出相同的14个结果