加入 2 个相同的表以在 MYSQL 中执行文本搜索

Question

我有 2 个完全一样的表：table1 和 table2，我需要执行相关的 table1，现在我正在使用 table1 进行以下查询。

    select SQL_CALC_FOUND_ROWS
                table1.slug as slugpost,
                table1.titulo,
                table1.id,
                table1.id_usu,
                table1.id_cat,
                table1.slug,
                table1.fecha,
                table1.html,
                table1.hit,
                table1.etiquetas,
                table1.status as table1tatus,
                categorias.nombre,
                categorias.slug as slugcategoria,
                categorias.icon,
                usuarios.id as idusuarios,
                usuarios.usuario
                    from table1 
                        LEFT JOIN usuarios
                            on table1.id_usu = usuarios.id
                        LEFT JOIN categorias on categorias.id=table1.id_cat
                        WHERE
                    MATCH(titulo, etiquetas, html) AGAINST ('".$query."')
                    limit 1,5;

查询工作正常，但如您所见，只需在 table1 上搜索即可。

Table1 保留我网站上的旧 table1（从 0 到 127000），table2 是新帖子的新表（从 127001 开始）。

编辑 我尝试使用 UNION 但我无法使其工作，MYSQL 说 找不到与列列表匹配的 FULLTEXT 索引。

SELECT SQL_CALC_FOUND_ROWS
                    t.slug as slugpost,
                    t.titulo,
                    t.id,
                    t.id_usu,
                    t.id_cat,
                    t.fecha,
                    t.html,
                    t.hit,
                    t.etiquetas,
                    t.status as table1tatus,
                    categorias.nombre,
                    categorias.slug as slugcategoria,
                    categorias.icon,
                    usuarios.id as idusuarios,
                    usuarios.usuario
FROM
(
SELECT table1.slug,table1.titulo,table1.id,table1.id_usu,table1.id_cat,table1.fecha,table1.html,table1.hit,table1.etiquetas,table1.status FROM table1
UNION
SELECT table2.slug,table2.titulo,table2.id,table2.id_usu,table2.id_cat,table2.fecha,table2.html,table2.hit,table2.etiquetas,table2.status FROM table2
) t
 LEFT JOIN usuarios on t.id_usu = usuarios.id
 LEFT JOIN categorias on categorias.id=t.id_cat
 WHERE
   MATCH(titulo, etiquetas, html) AGAINST ('dvdrip latino')
   limit 1,5;

我也运行了以下命令

 ALTER TABLE `table1` ADD FULLTEXT INDEX `test` (`title`, `tags`, `html`); 
 ALTER TABLE `table1` ADD FULLTEXT INDEX `test2` (`title`, `tags`, `html`); 

Answer 1

你可以这样做，通过在子选择中组合你的表

SELECT 
t.slug as slugpost
,...
FROM
(
SELECT * FROM table1 
UNION
SELECT * FROM table2 
) t
 LEFT JOIN usuarios on t.id_usu = usuarios.id
 LEFT JOIN categorias on categorias.id=t.id_cat
 WHERE ...

要使用全文搜索，您应该为两个表的列添加全文索引

ALTER TABLE `table1` ADD FULLTEXT INDEX `test` (`titulo`, `etiquetas`, `html`); 
ALTER TABLE `table1` ADD FULLTEXT INDEX `test2` (`titulo`, `etiquetas`, `html`); 

另一种使用全文索引的方法，您可以编写联合查询，如下所示，为子选择中的每个查询单独使用MATCH()

SELECT SQL_CALC_FOUND_ROWS
t.slug as slugpost,
t.titulo,
t.id,
t.id_usu,
t.id_cat,
t.fecha,
t.html,
t.hit,
t.etiquetas,
t.status as table1tatus,
categorias.nombre,
categorias.slug as slugcategoria,
categorias.icon,
usuarios.id as idusuarios,
usuarios.usuario
FROM
(
SELECT table1.slug,table1.titulo,table1.id,table1.id_usu,table1.id_cat,table1.fecha,table1.html,table1.hit,table1.etiquetas,table1.status FROM table1
WHERE MATCH(`title`, `tags`, `html`) AGAINST ('dvdrip latino')
UNION
SELECT table2.slug,table2.titulo,table2.id,table2.id_usu,table2.id_cat,table2.fecha,table2.html,table2.hit,table2.etiquetas,table2.status FROM table2
WHERE MATCH(`title`, `tags`, `html`) AGAINST ('dvdrip latino')
) t
LEFT JOIN usuarios on t.id_usu = usuarios.id
LEFT JOIN categorias on categorias.id=t.id_cat
limit 1,5;

MATCH() 列列表必须与某些列列表完全匹配 表的 FULLTEXT 索引定义，除非此 MATCH() 为 IN 布尔模式。布尔模式搜索可以在非索引列上进行， 尽管它们可能很慢。

http://dev.mysql.com/doc/refman/5.0/en/fulltext-restrictions.html

Answer 2

您确实在选择列表中将slug 列添加了两次，而这在子查询中是不允许的。删除一个事件：

FROM
(
SELECT table1.slug,table1.titulo,table1.id,table1.id_usu,table1.id_cat,table1.fecha,table1.html,table1.hit,table1.etiquetas,table1.status FROM table1
UNION
SELECT table2.slug,table2.titulo,table2.id,table2.id_usu,table2.id_cat,table2.fecha,table2.html,table2.hit,table2.etiquetas,table2.status FROM table2
) t