我正在制作一个电子商务网站,我有一个管理面板来控制网站。
从管理面板激活类别和产品过滤器时,此 sql 查询:
SELECT COUNT(DISTINCT products.product_id) AS products,
companies.company AS range_name,
UPPER(SUBSTRING(companies.company, 1, 1)) AS `index`,
companies.company_id AS range_id,
'S' AS field_type
FROM products
LEFT JOIN companies ON companies.company_id = products.company_id
INNER JOIN products_categories ON products_categories.product_id = products.product_id
LEFT JOIN categories ON categories.category_id = products_categories.category_id
LEFT JOIN companies AS companies ON companies.company_id = products.company_id
WHERE products.status IN ('A')
AND products_categories.category_id IN (261)
AND (categories.usergroup_ids = ''
OR FIND_IN_SET(0, categories.usergroup_ids)
OR FIND_IN_SET(1, categories.usergroup_ids))
AND (products.usergroup_ids = ''
OR FIND_IN_SET(0, products.usergroup_ids)
OR FIND_IN_SET(1, products.usergroup_ids))
AND categories.status IN ('A',
'H')
AND products.status IN ('A')
AND (companies.status = 'A')
GROUP BY products.company_id
ORDER BY companies.company
崩溃并向我显示错误:
Not unique table/alias: 'companies' Database (error): 1066
谁能帮忙找出这个查询中的错误?
提前致谢:)
最佳答案
您两次加入companies 表。这很好,但您必须使用不同的别名。
第一个连接没有别名所以被称为相同的; 公司。第二个是别名,但又使用了相同的名称 companies,这会引起冲突。
尝试使用不同的名称作为别名的良好做法,例如 companies1 和 companies2(或者更好,任何其他更有意义的名称),当然相应地更新您在选择、连接、位置、分组和顺序中的所有表引用。
关于php - 错误 : Not unique table/alias: 'companies' Database (error): 1066,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31362718/