查找重复项（一行/ea）并列出每个查找代码的重复项数

Question

我正在尝试查询具有重复项的产品，但每个重复条目只有一行。我还希望每个条目都显示有多少其他人喜欢它。这是我到目前为止所拥有的，但它有很多错误。我们将不胜感激有关如何简化和排除故障的提示。

 SELECT p1.id AS product_id,
 p1.lookup_code AS product_lookup_code,
 p1.name AS product_name,
 p2.id AS duplicate_id,
 p2.lookup_code AS duplicate_lookup_code,
 p2.name AS duplicate_name,
 COUNT(*) (FROM products AS p1 INNER JOIN products AS p2 ON p1.lookup_code = p2.lookup_code 
 INNER JOIN items ON p1.id = items.product_id 
 WHERE p1.id != p2.id 
 AND items.available = true 
 AND items.visible = true 
 AND items.unlisted = false) 
 HAVING COUNT > 1 LIMIT 5000

Answer 1

SELECT p.id, p.lookup_code, p.name, t.duplicate_count from products p INNER JOIN (
  SELECT count(id) as duplicate_count, lookup_code from products GROUP BY lookup_code HAVING count(id) > 1
) t on t.lookup_code = products.lookup_code;