Question

我有一张看起来像这样的表：

country + form_ID + Original_form_Id + catalog

country  original_form   catalog form_id
1        6                  42           6
1        7                  368           7
1        69                  722         69
1        69                 1837         697
1        659                  2           659
1        666                 2           666

original_form_id和form id：它总是相等的，除了的情况 country + original_form-id转到不同的目录，意思是这行：

country  original_form   catalog form_id
1        69                  722         69
1        69                 1837         697

我需要从中创建3个表。一个表用于所有行1：1（国家+ original_form到目录），第二个N：1和第三个1：N个案例。含义：

第一张表1：1

country  original_form   catalog
1        6      42
1        7      368

第二表1：N

country  original_form catalog
1        69      722
1        69     1837

第三张桌子N：1

country  original_form   catalog
1        659      2
1        666     2

我使用下面的答案实现它，但有重复：

INSERT INTO Mapping_1ToN
(SELECT  ot1.Country_id, ot1.original_form_id, ot1.catalog_id, ot1.Local_id
FROM    mappingtable ot1
WHERE   EXISTS -- Multiple catalogs for same country+form
        (
        SELECT  *
        FROM    mappingtable ot2
        WHERE   ot1.country_id = ot2.country_id
                AND ot1.original_form_id = ot2.original_form_id
                AND ot1.form_id <> ot2.form_id
                AND ot1.catalog_id <> ot2.catalog_id
        ));

INSERT  INTO Mapping_NTo1
(SELECT  ot1.Country_id, ot1.original_form_id, ot1.catalog_id, ot1.Local_id
FROM    mappingtable ot1
WHERE   EXISTS -- Multiple forms for same catalog
        (
        SELECT  *
        FROM    mappingtable ot2
        WHERE   ot1.country_id = ot2.country_id
                AND ot1.original_form_id <> ot2.original_form_id
                AND ot1.catalog_id = ot2.catalog_id
        ));


INSERT  INTO Mapping_1To1
(SELECT  ot1.Country_id, ot1.original_form_id, ot1.catalog_id, ot1.Local_id
FROM    mappingtable ot1
WHERE   NOT EXISTS -- form+catalog unique per country
        (
        SELECT  ot2.Country_id, ot2.original_form_id, ot2.catalog_id, ot2.Local_id
        FROM    mappingtable ot2
        WHERE   ot1.country_id = ot2.country_id
                AND (
                    (ot1.original_form_id = ot2.original_form_id AND ot1.catalog_id <> ot2.catalog_id AND ot1.form_id = ot2.form_id)
                    OR
                    (ot1.original_form_id <> ot2.original_form_id AND ot1.catalog_id = ot2.catalog_id)
                )
        ));

Answer 1

第一张表：

insert  Table1
select  *
from    OriginalTable ot1
where   not exists -- form+catalog unique per country
        (
        select  *
        from    OriginalTable ot2
        where   ot1.country = ot2.country
                and (
                    (ot1.form = ot2.form and ot1.catalog <> ot2.catalog)
                    or
                    (ot1.form <> ot2.form and ot1.catalog = ot2.catalog)
                )
        )

第二张表：

insert  Table2
select  ot1.*
from    OriginalTable ot1
where   exists -- Multiple catalogs for same country+form
        (
        select  *
        from    OriginalTable ot2
        where   ot1.country = ot2.country
                and ot1.form = ot2.form
                and ot1.catalog <> ot2.catalog
        )

第三张表：

insert  Table3
select  ot1.*
from    OriginalTable ot1
where   exists -- Multiple forms for same country+catalog
        (
        select  *
        from    OriginalTable ot2
        where   ot1.country = ot2.country
                and ot1.form <> ot2.form
                and ot1.catalog = ot2.catalog
        )

要查找最终会出现在Table2和Table3中的行，请运行：

select  *
from    OriginalTable ot1
where   exists
        (
        select  *
        from    OriginalTable ot2
        where   ot1.country = ot2.country
                and ot1.form <> ot2.form
                and ot1.catalog = ot2.catalog
        )
        and exists
        (
        select  *
        from    OriginalTable ot2
        where   ot1.country = ot2.country
                and ot1.form = ot2.form
                and ot1.catalog <> ot2.catalog
        )

SQL-如何在表中查找不同的案例

1 个答案: