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目录

深入理解数据库

sql执行顺序

FROM -> WHERE -> GROUP BY -> HAVING -> SELECT -> DISTINCT -> UNION -> ORDER BY -> LIMIT

FROM 才是 SQL 语句执行的第一步,并非 SELECT 。数据库在执行 SQL 语句的第一步是将数据从硬盘加载到数据缓冲区中,以便对这些数据进行操作

SELECT 是在大部分语句执行了之后才执行的,严格的说是在 FROM 和 GROUP BY 之后执行的。理解这一点是非常重要的,这就是你不能在 WHERE 中使用在 SELECT 中操作后产生的字段作为判断条件的原因。

无论在语法上还是在执行顺序上, UNION 总是排在在 ORDER BY 之前。也就是说,先进行聚合,再排序。

SELECT A.x + A.y AS z
FROM A
WHERE z = 10;  # z 在此处不可用,因为SELECT是最后执行的语句!

SELECT A.x + A.y AS z
FROM A
WHERE (A.x + A.y) = 10; # 重新写一遍 z 所代表的表达式
select A.aaa as a,max(B.bbb) as max_b,min(C.ccc)
from A left join B as BB on A.aaa = B.xxx left join C on B.xxx = C.xxx
where A.aaa = 'xxx' and BB.xxx < 'xxx'
group by A.aaa
having count(*) > 2
order by max_b desc
limit 10
  • 对上面这条 sql 语句的理解,我们必须按照 sql 的执行顺序来,并且要知道一个道理,先执行的语句 无法引用 后执行的语句中的内容

  • 首先,是from最先执行,它决定了对哪些表进行引用,将其加载到内存中处理,所以,我们知道,引用了 3 张表 ,A 表是完整的记录,B 表和C表的字段对A表进行补充

  • 表引用完后,我们得到的是一整张 大表 ,字段为三表字段之和,字段为 A.aaa A.xxx ... B.bbb B.xxx ...C.ccc C.xxx... 这样子,记录的话,由于是A表的左连接,所以A表的记录全在,A表记录中 没匹配到B表C表记录 的字段,全部设置为 Null

  • 拿到大表后,我们接着使用 where条件对大表里面记录进行筛选,由于select语句还未执行,所以不能使用select语句里面的字段别名,比如A.aaa就不能替换为a; 而from语句中使用的表别名 是可以引用的,因为它已经执行了,比如 B.xxx 可以替换为 BB.xxx
    - where筛选完后,接着 如果有按照某字段分组需求,或者聚合需求,就使用group by语句和聚合函数进行处理了

  • 分组完后,如果对组还有筛选的话,就使用having来处理了,having条件是对每个分组进行筛选,在条件内的聚合函数的作用范围只在该分组内,比如count(*)就是只统计该分组内的记录个数,所以having count(*) > 2就是筛选出记录数大于2个的分组,再比如having min(收入) > 1000 就是筛选出最低收入于1000的组

  • 分完组之后,就是select挑选数据了,用select挑选想要的字段,但是如果进行了group by的话,一定要 对除分组字段以外 的字段进行聚合,比如max(B.bbb)min(C.ccc)

  • select完数据后,记录是无序的,这时可以对记录进行排序了,order by max_b desc,这里就可以使用select语句里的别名了,因为select已经执行过了

  • 最后limit选下要输出几条记录

SQL 语言的核心是对表的引用(table references)

FROM a, b # 两个表的笛卡尔积 组成的新表
  • 上面这句 FROM 语句的输出是一张联合表,联合了表 a 和表 b 。如果 a 表有三个字段, b 表有 5 个字段,那么这个 输出表 就有 8 个字段。这个联合表里的数据是 a * b,即 a 和 b 的笛卡尔积。换句话说,也就是 a 表中的每一条数据都要跟 b 表中的每一条数据配对。如果 a 表有3 条数据, b 表有 5 条数据,那么联合表就会有 15 条数据。

  • FROM 输出的结果被 WHERE 语句筛选后要经过 GROUP BY 语句处理,从而形成新的输出结果。

  • 从集合论(关系代数)的角度来看,一张数据库的表就是一组数据元的关系,而每个 SQL 语句会改变一种或数种关系,从而产生出新的数据元的关系,即产生新的表

ON 条件 vs Where 条件 vs Having 条件

  • ON 条件用在表的连接,比如 from A left join B on A.xxx = B.xxx

  • Where 条件 在表的连接完成后执行,用于筛选记录 form ... where A.xxx = xxx

  • Having 条件用在where完成筛选,并且再进行group by分组之后,用于筛选分组,group by xxx having count(*) > 2 用于筛选出记录数多于2个的分组