[英]Two Select query help needed
SELECT r.nid
FROM recipe_node_ingredient r,recipe_ingredient ri
WHERE r.`ingredient_id` = ri.id
AND ri.name = 'carrot'
AND r.nid NOT IN (SELECT r.nid
FROM recipe_node_ingredient r,recipe_ingredient ri
WHERE r.`ingredient_id` = ri.id AND ri.name = 'salt');
该查询将返回节点ID。
并且此查询还返回Node ID。
SELECT nid
FROM taxonomy_index JOIN taxonomy_term_data USING (tid)
WHERE name IN ('Desert."', 'Indian')
GROUP BY nid HAVING COUNT(*) > 1
是否有可能在MySQL查询中检查两个返回节点ID是否相等?
MYSQL中没有什么可以检查查询中是否相等的(从不同的查询返回结果)
您的要求是业务逻辑。 因此,您将第一个查询的返回值与第二个查询的返回值进行比较,并在代码中进行比较!
好吧,你可以尝试这样的事情:
SELECT *
FROM (SELECT r.nid
FROM recipe_node_ingredient r,
recipe_ingredient ri
WHERE r.`ingredient_id` = ri.id
AND ri.name = 'carrot'
AND r.nid NOT IN (SELECT r.nid
FROM recipe_node_ingredient r,
recipe_ingredient ri
WHERE r.`ingredient_id` = ri.id
AND ri.name = 'salt')) subSelect1,
(SELECT nid
FROM taxonomy_index
JOIN taxonomy_term_data USING (tid)
WHERE name IN ('Desert."','Indian')
GROUP BY nid
HAVING COUNT(*) > 1) subSelect2
WHERE subSelect1.nid = subSelect2.nid
如果您没有从该查询中得到结果,则说明这些字符不匹配。
如何使用FULL OUTER JOIN比较结果?
SELECT
nid,
IFNULL(from_recipe, 0) from_recipe,
IFNULL(from_taxonomy, 0) from_taxonomy
FROM
(
SELECT r.nid, 1 AS from_recipe
FROM recipe_node_ingredient r
WHERE EXISTS (
SELECT 1 FROM recipe_ingredient WHERE id = r.ingredient_id AND name = 'carrot'
)
AND NOT EXISTS (
SELECT 1 FROM recipe_ingredient WHERE id = r.ingredient_id AND name = 'salt'
)
) AS recipe
FULL OUTER JOIN (
SELECT ti.nid, 1 AS from_taxonomy
FROM taxonomy_index td
INNER JOIN taxonomy_term_data ti ON td.tid = it.tid
WHERE td.name IN ('Desert."', 'Indian')
GROUP BY ti.nid
HAVING COUNT(*) > 1
) AS taxonomy ON recipe.nid = taxonomy.nid
WHERE
IFNULL(from_recipe, 0) + IFNULL(from_taxonomy, 0) = 1
WHERE from_recipe + from_taxonomy = 1
将返回仅在一个查询中的行。 使用= 2
查看另一半,或将其完全忽略以查看哪个。
select if(select r.nid from recipe_node_ingredient r,recipe_ingredient ri where
r.`ingredient_id` = ri.id and ri.name = 'carrot' and r.nid
NOT IN (select r.nid from recipe_node_ingredient r,recipe_ingredient ri
where r.`ingredient_id` = ri.id and ri.name = 'salt') == (SELECT nid FROM taxonomy_index JOIN taxonomy_term_data
USING (tid) WHERE name IN ('Desert."', 'Indian')
GROUP BY nid HAVING COUNT(*) > 1),'true','false')
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