Question

您好我正在尝试在sql中使用match和from进行查询以按相关性排序。我不想使用类似的查询或REGEXP，因为我的索引是一个FULLTEXT，它会运行得更快......

这是我的疑问：

id  books              relavance

2   book, folder, paper    '0.15835624933242798'

5  'book                  '0.15835624933242798'

我得到的结果是：

key             type      unique   columns

idx_test_books  FULLTEXT  NO       books

数据表是：

id是INT（11）书籍LONGTEXT

我拥有的索引：

count()

我想只检索ID为5的书：'book

Answer 1

您无法使用FULLTEXT搜索'book，撇号将被忽略。 FULLTEXT索引为builds with words。

MariaDB [test]> SELECT *, MATCH(books) AGAINST('"book,.,.,.,$%$:;§$%:;§$%§$:$%"') AS relevance FROM Books ORDER BY relevance;
+----+---------------------+----------------------------+
| id | books               | relevance                  |
+----+---------------------+----------------------------+
|  1 | book, folder, paper | 0.000000001885928302414186 |
|  2 | 'book               | 0.000000001885928302414186 |
+----+---------------------+----------------------------+
2 rows in set (0.00 sec)

MariaDB [test]> SELECT *, MATCH(books) AGAINST('"book,.,.,.,$%$:;§$%folder:;§$%§$:$%"') AS relevance FROM Books ORDER BY relevance;
+----+---------------------+--------------------+
| id | books               | relevance          |
+----+---------------------+--------------------+
|  2 | 'book               |                  0 |
|  1 | book, folder, paper | 0.0906190574169159 |
+----+---------------------+--------------------+
2 rows in set (0.00 sec)

MariaDB [test]> SELECT *, MATCH(books) AGAINST('"book folder"') AS relevance FROM Books ORDER BY relevance;
+----+---------------------+--------------------+
| id | books               | relevance          |
+----+---------------------+--------------------+
|  2 | 'book               |                  0 |
|  1 | book, folder, paper | 0.0906190574169159 |
+----+---------------------+--------------------+
2 rows in set (0.00 sec)

Sql查询匹配和使用正则表达式相关的顺序？

1 个答案: