Question

我使用MySQL，我想根据subQuery的结果过滤table1的结果。我所做的就是2个查询，但不相同。

第一个查询将为我提供用户的所有类别：查询1

SELECT 
 `category-id` as `id`
FROM
 `categories-in-teams` as cit
    JOIN
 `user-role-teams` AS urt ON cit.`team-id` = urt.`team-id`
WHERE
 urt.`user-id` = 62

结果如下：

现在，在我的第二个请求中，我获得了包含一些其他数据的整个类别列表：查询2

SELECT 
cat.`id`,
loc.`name`,
cat.`parent`,
pcat.`id` IS NULL as leaf
FROM
`product-category` AS cat
    LEFT JOIN
`product-category` as pcat ON cat.`id` = pcat.`parent`
    JOIN
`product-category-local` as loc ON cat.`id` = loc.`category-id`
    AND loc.`lang-id` = 1

GROUP BY cat.`id`
ORDER BY cat.`parent` , `name`

输出：

id      name        parent  leaf
1       Root        null    0
2       Bathroom    1       0
3       Bedroom     1       0
100     pillow      3       1
200     sofa        3       1
300     blanket     3       1
400     dunno       3       1

我想从第二个查询获得的结果将从第一个查询中获取结果并排除leaf = 0且id不在{{parent上的所有行（类别） 1}}列。

因此，从上面的例子中，预期的结果将是：

id      name        parent  leaf
1       Root        null    0
3       Bedroom     1       0
100     pillow      3       1
200     sofa        3       1
300     blanket     3       1
400     dunno       3       1

Answer 1

试试这个：

SELECT 
cat.`id`,
loc.`name`,
cat.`parent`,
pcat.`id` IS NULL as leaf
FROM
`product-category` AS cat
    LEFT JOIN
`product-category` as pcat ON cat.`id` = pcat.`parent`
    JOIN
`product-category-local` as loc ON cat.`id` = loc.`category-id`
    AND loc.`lang-id` = 1
WHERE cat.`id` IN (
    SELECT 
   `category-id` as `id`
    FROM
    `categories-in-teams` as cit
    JOIN
    `user-role-teams` AS urt ON cit.`team-id` = urt.`team-id`
    WHERE
    urt.`user-id` = 62
)    
OR
((pcat.`id` = 0) AND (cat.`id` IN (SELECT parent FROM `product-category`)) )
GROUP BY cat.`id`
ORDER BY cat.`parent` , `name`

JOIN表与自身和过滤器取决于子查询

1 个答案: