mysql - 如何为每个订单创建一个 MySQL 视图

Question

我的数据：

我如何到那里？我试图在我的 TAX 表上创建一个 MySQL 视图。

创建视图 TaxSplitPerOrder AS SELECT OrderNumber, tax_invoiced, total_invoiced, created_at, tax_percent, SUM( tax_invoiced_order_item) FROM test GROUP by OrderNumber;

谁能帮我？

Answer 1

SELECT您需要在GROUP BY子句中包含您的所有其他非汇总列。您可能也想求和total_invoiced，否则每个订单号仍然有 2 行。

Answer 2

查询：

SELECT OrderNumber, tax_invoiced, total_invoiced, created_at, MAX(CASE WHEN tax_percent= 21 THEN tax_invoiced_order_itemEND) tax_21, MAX(CASE WHEN tax_percent= 6 THEN tax_invoiced_order_itemEND)tax_6 从测试组按订单号；