Question

我有这个查询工作：

SELECT  posts.titulo as value,
        posts.id as id
FROM posts,familias,textos
WHERE
    lower(titulo) LIKE 'my title' 
    AND posts.id_familia = familias.id $familiaQuery
    AND familias.clave = textos.clave 
    AND textos.lengua = 1
GROUP by posts.id
ORDER by count(*) desc

但我想添加标签搜索

SELECT  posts.titulo as value,
        posts.id as id
FROM posts,familias,textos
    LEFT JOIN tags_map ON tags_map.id_post = posts.id
    LEFT JOIN tags ON tags_map.id_ing = tags.id
WHERE
    tags.nombre LIKE 'php'
    AND lower(titulo) LIKE 'my title' 
    AND posts.id_familia = familias.id $familiaQuery
    AND familias.clave = textos.clave 
    AND textos.lengua = 1
GROUP by posts.id
ORDER by count(*) desc

但是我得到了这个错误Unknown column 'posts.id' in 'on clause'我不明白，这个领域一直都在那里，

为什么它无法找到它？

Answer 1

仅使用来自clause无逗号

的加入.`

SELECT  posts.titulo as value,
        posts.id as id
FROM posts
    JOIN familias ON posts.id_familia = familias.id  
    JOIN textos ON familias.clave = textos.clave 
    LEFT JOIN tags_map ON tags_map.id_receta = posts.id
    LEFT JOIN tags ON tags_map.id_ing = tags.id
WHERE
    tags.nombre LIKE 'php'
    AND lower(titulo) LIKE 'my title' 
    $familiaQuery
    AND textos.lengua = 1
GROUP by posts.id
ORDER by count(*) desc

Answer 2

你可能会混淆语法。

我认为您可以将查询包装在子查询中，以防您想要保留它：

未知的条款＆＃39;添加左连接时

2 个答案: