MySQL双左连接、条件或组

我有点问题。 我试着数一数分类和子分类中的所有文章

我使用这个查询：

SELECT 
    cat.*, COUNT(art.id) AS total
FROM
    article_categories cat
        LEFT JOIN
    article_categories c2 ON (c2.category_parent = cat.category_id)
        LEFT JOIN
    articles art ON (art.cid = cat.category_id
        OR art.cid = c2.category_id)
WHERE
    cat.category_parent = 0 AND art.st = 1
        AND IF(art.cid IN (2 , 4, 16, 17, 18, 19, 20, 21, 22),
        TO_DAYS(CURDATE()) - TO_DAYS(art.date_edit) < 120,
        art.cid)
GROUP BY IF(c2.category_parent > 0,
    c2.category_parent,
    cat.category_id)
ORDER BY cat.category_order ASC

SELECT 
    *
FROM
    `articles`
WHERE
    st = 1
        AND cid IN (2 , 4, 16, 17, 18, 19, 20, 21, 22)
        AND IF(cid IN (2 , 4, 16, 17, 18, 19, 20, 21, 22),
        TO_DAYS(CURDATE()) - TO_DAYS(date_edit) < 120,
        cid)

谢谢你的帮助

[编辑]

$sql1 = "SELECT cat.*, COUNT(art.id) AS total FROM article_categories cat LEFT JOIN articles art ON (art.cid = cat.category_id) WHERE cat.category_parent = 0 AND IF(art.cid IN (2 , 4, 16, 17, 18, 19, 20, 21, 22), TO_DAYS(CURDATE()) - TO_DAYS(art.date_edit) < 120, art.cid) GROUP BY art.cid";

$category = array();
foreach ($row as $cat) {
    $total = $cat['total'];
    $sql2 = "SELECT cat.*, COUNT(art.id) AS total FROM article_categories cat LEFT JOIN articles art ON (art.cid = cat.category_id) WHERE cat.category_parent = ".$cat['category_id']." AND IF(art.cid IN (2 , 4, 16, 17, 18, 19, 20, 21, 22), TO_DAYS(CURDATE()) - TO_DAYS(art.date_edit) < 120, art.cid) GROUP BY art.cid";
    foreach ($row2 as $cat2) {
        $total += $cat2['total'];
    }
    $category[] = array('category_id'=> $cat['category_id'], 'total' => $total);
}

$sql1=“选择cat.*，将（art.id）计算为从文章类别cat LEFT加入文章艺术ON（art.cid=cat.category\u id）的总数，其中cat.category\u parent=0，如果（art.cid在（2,4,16,17,18,19,20,21,22）到（CURDATE（））-到（art.date\u edit）<120，art.cid）按art.cid分组”；
$category=array（）；
foreach（行作为$cat）{
$total=$cat['total']；
$sql2=“选择cat.*，将（art.id）作为从文章类别cat LEFT JOIN articles art ON（art.cid=cat.category_id）中的总计，其中cat.category_parent=“.cat['category_id']”和IF（art.cid在（2,4,16,17,18,19,20,21,22）中）到_DAYS（CURDATE（））-到_DAYS（art.date_edit）<120，art.cid）按art.cid分组”；
foreach（$2行作为$2类）{
$total+=$cat2['total']；
}
$category[]=数组（'category\u id'=>$cat['category\u id']，'total'=>$total）；
}

我创建了另一个表：article\u categories\u rel

article_categories_rel
- child_id
- parent_id

我自己的新查询：

SELECT
    cat.*,
    COUNT(art.id) as ilosc
FROM
    article_categories cat
LEFT JOIN
    article_categories_rel acr
    ON
        (cat.category_id=acr.parent_id)
LEFT JOIN
    articles art
    ON (
        art.cid = acr.child_id AND
        art.st=1 AND
        if(art.cid in(2,4,16,17,18,19,20,21,22),
        TO_DAYS( curdate( ) ) - TO_DAYS( art.date_edit )<120,
        art.cid)
    )
WHERE
    cat.category_parent=0
GROUP BY
    cat.category_id
ORDER BY
    cat.category_order ASC;

选择
猫*，
将（艺术id）计算为ilosc
从…起
第11条类别
左连接
第条（类别）相关acr
在…上
（类别识别号=acr.父类识别号）
左连接
文章艺术
在(
art.cid=acr.child\u id和
第st条=1和
如果（2,4,16,17,18,19,20,21,22）中的第cid条，
TO_DAYS（curdate（））-TO_DAYS（art.date_edit）您期望什么以及为什么？我想显示主要类别，并用文章（包含子类别中的所有文章）计算它们您的问题是什么？您是否期望得到不同的结果？问题是，对某些类别的第一次查询计数为36355条记录，但应计数为7730条记录。请您解释一下为什么期望得到此结果？
SELECT
    cat.*,
    COUNT(art.id) as ilosc
FROM
    article_categories cat
LEFT JOIN
    article_categories_rel acr
    ON
        (cat.category_id=acr.parent_id)
LEFT JOIN
    articles art
    ON (
        art.cid = acr.child_id AND
        art.st=1 AND
        if(art.cid in(2,4,16,17,18,19,20,21,22),
        TO_DAYS( curdate( ) ) - TO_DAYS( art.date_edit )<120,
        art.cid)
    )
WHERE
    cat.category_parent=0
GROUP BY
    cat.category_id
ORDER BY
    cat.category_order ASC;