每日日志类型摘要

Question

tbl_logs包含以下列：

logtimestamp, level, message

'level'可以是：错误，警告，信息，确定

我想创建一个查询，返回每天每个级别的日志数量摘要：

logdate, error_qty, warning_qty, info_qty, ok_qty

这可以在一个查询中完成吗？

我试过了：

SELECT DATE(logtimestamp) as logdate, count(*) as qty, level
FROM tbl_logs
GROUP BY logdate, level
ORDER BY logdate DESC

但是这个查询每个logdate / level组合返回一个ROW（日期将重复）。

我还尝试使用UNION：

创建查询

SELECT count(*) as error_qty ... WHERE level = 'error'...
UNION 
SELECT count(*) as warning_qty ... WHERE level = 'warning'...
...

但无法使其发挥作用。

这可以在一个查询中完成，还是我需要进行多次查询并在我的应用程序中组合输出？

Answer 1

SELECT DATE(logtimestamp) AS logdate,
    SUM(level = 'error') AS error_qty,
    SUM(level = 'warning') AS warning_qty,
    SUM(level = 'info') AS info_qty,
    SUM(level = 'ok') AS ok_qty
FROM tbl_logs
GROUP BY logdate
ORDER BY logdate DESC