Oracle-将多个计数作为一个查询返回

问题描述

我有几个查询，详细说明如下.我希望能够运行一个同时返回两个计数的SQL查询，这可能吗?

I have a couple of queries, detailed below. I'd like to be able to run one SQL query which returns both counts, is this possible?

1.

select nvl(count(rowid), 0) from tablename where OPP = 'FOO' and date = 'BAZ';

2.

select nvl(count(rowid), 0) from tablename where OPP = 'BAR' and date = 'BAZ';

到目前为止，我仅在搜索中找到MSSQL特定的解决方案.

I've only found MSSQL specific solutions in my searches so far.

推荐答案

如果在一行中需要它们:

If you need them in a single row:

SELECT
    COUNT(CASE OPP WHEN 'FOO' THEN 1 END),
    COUNT(CASE OPP WHEN 'BAR' THEN 1 END)
FROM tablename
WHERE OPP IN ('FOO', 'BAR') AND date = 'BAZ'

(无论如何，Thilo的GROUP BY方法都是更好的通用解决方案.)

(The GROUP BY approach by Thilo is a better generic solution anyway.)

修改:我已删除NVL().我已经忘记了为什么我从不使用它.

I've removed NVL(). I had forgotten why I never use it.

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