Question

我对Acccess 2013有这个SQL查询，但我想有一个额外的条件说：

 WHERE CLASS = 'ECN'.

我无法找到将其集成到现有查询中的方法 - 希望有人可以给我一个提示。

    SELECT m.ID, m.PN, m.CLASS, m.ZAHL, (
        SELECT Count(*)
        FROM Table1 AS m2
        WHERE m2.PN = m.PN AND m2.ID <= m.ID
    ) AS IncByPN
FROM Table1 AS m
ORDER BY m.ID;

所以我希望结果表只显示

行

   CLASS = 'ECN'

Answer 1

尝试这样的事情：

SELECT m.ID,
    m.PN,
    m.CLASS,
    m.ZAHL,
    Count(M2.id) AS IncByPN
FROM Table1 AS m
    INNER JOIN Table1 AS m2 ON m2.PN = m.PN AND m2.ID <= m.ID
WHERE m.CLASS='ECN'
GROUP BY m.ID, m.PN, m.CLASS, m.ZAHL
ORDER BY m.ID

带有额外AND条件的SQL ACCESS子查询

1 个答案: