我有这个问题:
SELECT COUNT(*) AS invoice_count, IFNULL(SUM(qa_invoices.invoice_total), 0)
AS invoice_total, IFNULL(SUM(qa_invoices.invoice_discount) ,0) AS invoice_discount
FROM qa_invoices
WHERE (DATE(qa_invoices.invoice_date) BETWEEN '12/06/25' AND '12/06/25')
AND qa_invoices.status_code IN (5, 8)
UNION
SELECT IFNULL(SUM(qa_returns.client_credit), 0)
FROM qa_returns
WHERE (DATE(qa_returns.returnlog_date) BETWEEN '12/06/25' AND '12/06/25');
我得到错误:
The used SELECT statements have a different number of columns.
我正在尝试使用 UNION 命令加入这 2 个选择,如果我们查看 returnlog_date
和 invoice_date
具有相同的数据条件,如果有任何方法可以执行将两个查询合二为一会更好。
最佳答案
使用子选择:
SELECT
COUNT(*) AS invoice_count,
IFNULL(SUM(invoice_total), 0) AS invoice_total,
IFNULL(SUM(invoice_discount), 0) AS invoice_discount,
(
SELECT IFNULL(SUM(qa_returns.client_credit), 0)
FROM qa_returns
WHERE qa_returns.returnlog_date >= '2012-06-25'
AND qa_returns.returnlog_date < '2012-06-26'
) AS client_credit
FROM qa_invoices
WHERE invoice_date >= '2012-06-25'
AND invoice_date < '2012-06-26'
AND status_code IN (5, 8)
关于mysql - UNION MySQL 的问题,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/11215110/