SQL 从 Access 数据库中查找击球平均值的语句

Question

我正在使用 Microsoft Access 数据库创建 Visual Basic 程序。

数据库有两个表。

Table 1 名被称为 Players，具有名称、命中率、atBats 和团队列
Table 2 人被称为 Teams，有团队和联赛列

我需要帮助编写 SQL 声明以找到特定联盟中击球率最高的球员 National 或 American联赛。

Batting Average 公式是 hits 除以 atBats。

代码：

SELECT 
    name, (hits / atBats) AS bAVG 
FROM 
    Players 
INNER JOIN 
    Teams ON Teams.team = Players.Team 
WHERE 
    Teams.league = 'American' 
    AND bAVG = (SELECT MAX(bAVG) FROM Players);

我认为问题出在别名列 bAVG 上。

Answer 1

联接的 table 中没有列 bAVG，因此出现错误。您可以使用类似的东西：

SELECT name from Players, (hits/atBats) as bAVG FROM Players INNER JOIN Teams ON Teams.team = Players.Team WHERE Teams.league = 'American' AND (hits/atBats) = (select MAX((hits/atBats) from Players));

Answer 2

您可以使用 order by 和 top 来做到这一点：

SELECT TOP 1 name, (hits/atBats) AS bAVG
FROM Players INNER JOIN
     Teams
     ON Teams.team = Players.Team
WHERE Teams.league = 'American'
ORDER BY hits/atBats DESC;

SQL 从 Access 数据库中查找击球平均值的语句

SQL statement to find batting average from Access Database

sql

ms-access

vba