Question

假设用户有一个搜索表单，他搜索属性。让我们说他选择：

Location : ABC
Price Range : 1 million - 5 millions
No. of Bedrooms Range : 5 - 12
State : XYZ
County : PQR
Category: MNO

很有可能匹配他选择的所有字段以从数据库中产生结果。所以在AND条件下使用WHERE在这里似乎没有效果。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，则显示结果
如果位置，卧室，类别，状态匹配，则显示结果
等......如果任何组合匹配，则显示结果

Answer 1

您希望在WHERE子句中创建多个条件

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 (...)
...

这允许您希望有效的任何数据组合返回数据。

Answer 2

如何过滤表格以查找与任何搜索字词匹配的记录，并按匹配字词数量的降序对结果进行排序：

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

Answer 3

与eggyals解决方案类似，但只是带回你关心的行。没有经过测试，请原谅任何拼写错误： -

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

如果任何组合匹配，MySQL将显示结果

3 个答案: