SELECT 来自 2 个条件不同的表

Question

我试了大约 2 个小时没有成功。这是我需要做的一个例子：

表格

people:

nameA           score
---------------------
someone1        24
someone2        24
someone3        24
someone4        23
someone5        21
someone6        24
someone7        19
someone8        20
someone9        24
someone10       24

runs:

nameB           add
---------------------
someone1        s
someone2
someone2
someone4        s
someone5
someone4
someone7        s
someone8        s
someone7
someone7        s

请注意，这只是一个直观地展示我的问题的例子。我的table的设置就不用说了吧

我想知道的：
首先，我需要来自 table people 的所有条目，其中分数小于 24（很容易到这里）。

下一步是只显示 people.name 在 table runs 中没有 s 的结果（我的实际问题）。

输出应该是：

name            score
---------------------
someone2        22      /*  no "s"-entry in runs        */
someone5        21      /*  also no entries             */

很遗憾，我对联接不是很熟悉。这是我最后一次尝试：

SELECT nameA,score FROM runs,people WHERE people.nameA = runs.nameB
AND people.score < 24
AND runs.add != "s"
GROUP BY people.nameA

在伪代码中：

foreach Person in (SELECT nameA as Person,score FROM people WHERE score < 24)
SHOW name.B = Person WHERE add != "s"

我知道这很糟糕 :)。但它用两行描述了我需要的东西。

如有任何帮助，我将不胜感激。
谢谢！

Answer 1

select * from people where score<24 and 
name in (select name from runs where add!=s) and
name not in (select name from runs where add=s)

Answer 2

SELECT people.nameA,runs.score FROM runs,people WHERE people.nameA = runs.nameB
AND people.score < 24
AND people.nameA NOT IN (SELECT runs.nameB FROM RUNS WHERE runs.add = "s")
GROUP BY people.nameA

SELECT 来自 2 个条件不同的表

SELECT from 2 tables with different conditions

mysql

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join

multi-query