mysql - 在 MATCH() AGAINST() 中查找匹配列的名称或别名

Question

我正在使用 MATCH() AGAINST() 在我的数据库中进行全文搜索。因为我想要来自多个表的数据，所以我创建了一个 VIEW 并在 MARIADB 中使用以下查询格式，

SELECT 
DAT1, DAT2, DAT3 
FROM VIEW1
WHERE 
MATCH (COL1) AGAINST ('lisa mona aachen' IN NATURAL LANGUAGE MODE) OR
MATCH (COL2) AGAINST ('lisa mona aachen' IN NATURAL LANGUAGE MODE) OR
MATCH (COL3) AGAINST ('lisa mona aachen' IN NATURAL LANGUAGE MODE)

一切正常，但我正在查询中寻找附加输出，那就是我在其中找到搜索结果的列名。

如何在查询输出中获取匹配字符串的名称或别名COL1、COL2 和COL3？

Answer 1

您可以在 select 中使用 case 表达式:

SELECT DAT1, DAT2, DAT3,
       CONCAT_WS(',',
                 (CASE WHEN MATCH(COL1) AGAINST ('lisa mona aachen' IN NATURAL LANGUAGE MODE) > 0 THEN 'col1' END),
                 (CASE WHEN MATCH(COL2) AGAINST ('lisa mona aachen' IN NATURAL LANGUAGE MODE) > 0 THEN 'col2' END),
                 (CASE WHEN MATCH(COL2) AGAINST ('lisa mona aachen' IN NATURAL LANGUAGE MODE) > 0 THEN 'col3' END)
                ) as cols
FROM VIEW1
WHERE MATCH (COL1) AGAINST ('lisa mona aachen' IN NATURAL LANGUAGE MODE) > 0 OR
      MATCH (COL2) AGAINST ('lisa mona aachen' IN NATURAL LANGUAGE MODE) > 0 OR
      MATCH (COL3) AGAINST ('lisa mona aachen' IN NATURAL LANGUAGE MODE) > 0;