显示Rownum问题MySQL

Question

我有这个查询：

SET @row_num = 0;
SELECT
(SELECT @row_num := @row_num + 1) AS itempurchase_code,
(SELECT supplier_code FROM qa_items_purchases a WHERE a.item_invoicecodesupplier = b.item_invoicecodesupplier GROUP BY supplier_code ORDER BY COUNT(*) DESC LIMIT 1) AS supplier_code, 
(SELECT user_code FROM qa_items_purchases a WHERE a.item_invoicecodesupplier = b.item_invoicecodesupplier GROUP BY user_code ORDER BY COUNT(*) DESC LIMIT 1) AS user_code,
22 AS status_code,
item_invoicecodesupplier AS item_invoicecodesupplier,
(SELECT itempurchase_date FROM qa_items_purchases a WHERE a.item_invoicecodesupplier = b.item_invoicecodesupplier GROUP BY itempurchase_date ORDER BY COUNT(*) DESC LIMIT 1) AS itempurchase_date
FROM qa_items_purchases b 
GROUP BY (item_invoicecodesupplier) 
ORDER BY itempurchase_code;

我得到了这个结果：

如果您看起来没有（2）itempurchase_code列，我可以做些什么来按顺序显示数字？

Answer 1

如果您的查询包含GROUP BY，则必须在外部查询中添加行号。

SET @row_num = 0;
SELECT (SELECT @row_num := @row_num + 1) AS itempurchase_code, *
FROM
(
    SELECT ... -- your original query goes here
) AS T1
ORDER BY itempurchase_code