SQL：将两个计数查询合并为一个

目前，我有两个sql查询，每个查询返回特定日期特定列的总计数：

select first_name COUNT(*) as totalCount from some_table
where the_date >= '2020-09-14' and the_date <='2020-09-15' 
group by first_name

select first_name COUNT(*) as totalCount from some_table
where the_date >= '2020-09-16' and the_date <='2020-09-17' 
group by first_name

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但它仍然只返回count1的结果。

使用条件聚合：

SELECT
    first_name,
    COUNT(*) FILTER (WHERE the_date >= '2020-09-14' AND the_date < '2020-09-15') AS totalCount1,
    COUNT(*) FILTER (WHERE the_date >= '2020-09-16' AND the_date < '2020-09-17') AS totalCount2
FROM some_table
GROUP BY
    first_name;

---

使用条件聚合：

SELECT
    first_name,
    COUNT(*) FILTER (WHERE the_date >= '2020-09-14' AND the_date < '2020-09-15') AS totalCount1,
    COUNT(*) FILTER (WHERE the_date >= '2020-09-16' AND the_date < '2020-09-17') AS totalCount2
FROM some_table
GROUP BY
    first_name;

---

你试过联合吗？@Mech我试过，让我加上我试过的。你试过联合吗？@Mech我试过，让我加上我试过的。这太棒了！！当totalCount1和totalCount2同时为0时，我如何过滤掉呢？@MohamadZein检查更新的答案，希望这有帮助。哦，我是说，从你写的第一个查询中，我想过滤掉totalCount1列和totalCount2列同时为0的行…我的答案底部的查询是这样做的：-这太棒了！！当totalCount1和totalCount2同时为0时，我如何过滤掉呢？@MohamadZein检查更新的答案，希望这有帮助。哦，我是说，从你写的第一个查询中，我想过滤掉totalCount1列和totalCount2列同时为0的行……我的答案底部的查询是这样做的：-

the_date >= '2020-09-14' AND the_date < '2020-09-15'

SELECT
    first_name
FROM some_table
GROUP BY
    first_name
HAVING
    COUNT(*) FILTER (WHERE the_date >= '2020-09-14' AND the_date < '2020-09-15' OR
                           the_date >= '2020-09-16' AND the_date < '2020-09-17') = 0;