Question

qFieldInner

PARAMETERS pText1 Text ( 255 );
SELECT entries.en_main, MIN(entries.en_id) AS en_id
FROM entries
WHERE (((entries.en_main) In (625, 1310)))
GROUP BY en_main;

当我运行此查询时，它返回：

625 76719
1310 177239

但是，如果我将其转换为：

PARAMETERS pText1 Text ( 255 );
SELECT entries.en_main, MIN(entries.en_id) AS en_id
FROM entries
WHERE (((entries.en_main) In (SELECT en_main FROM qFieldInnest)))
GROUP BY en_main;

然后它就会挂起。

qFieldInnest 是这个，当我手动运行时正确返回625和1310

PARAMETERS pText1 Text ( 255 );
SELECT DISTINCT entries.en_main
FROM entries
WHERE (((entries.en_lect) Like ("* " & [pText1] & "*") Or (entries.en_lect) Like ([pText1] & "*")) AND ((entries.en_ref)=0) AND (((entries.en_se)=1) OR ((entries.en_meros)=6))) OR (((entries.en_thama) Like ("* " & [pText1] & "*") Or (entries.en_thama) Like ([pText1] & "*")));

我无法理解这里出了什么问题。

Answer 1

我会使用查询来处理此问题，该查询使用qFieldInnest中的SQL作为子查询，并将INNER JOIN子查询使用entries表。

WHERE中的qFieldInnest条款让我难以理解。它也将挑战数据库引擎，因为它必须做多少工作。

我没有什么可以测试的，所以不确定我是否在下面的SQL中犯了错误。如果它不起作用，请将子查询SQL分解为新查询并单独测试。

PARAMETERS pText1 Text ( 255 );
SELECT e.en_main, MIN(e.en_id) AS en_id
FROM
    entries AS e
    INNER JOIN
    (
        SELECT DISTINCT en_main
        FROM entries
        WHERE
                (
                    (
                           en_lect Like "* " & [pText1] & "*"
                        Or en_lect Like [pText1] & "*"
                    )
                    AND en_ref=0
                    AND
                        (
                               en_se=1
                            OR en_meros=6
                        )
                )
            OR
                (
                       en_thama Like "* " & [pText1] & "*"
                    Or en_thama Like [pText1] & "*"
                )

    ) AS sub
    ON e.en_main = sub.en_main
GROUP BY e.en_main;

ms访问查询挂起

1 个答案: