多个表的视图。需要删除“双打”由1个表定义
好吧,这就是我所坚持的。
SELECT dbo.InstellingGegevens.INST_SUBTYPE, dbo.InstellingGegevens.INST_BRON, dbo.InstellingGegevens.INST_INSTELLINGSNUMMER,
dbo.InstellingGegevens.INST_NAAM, dbo.InstellingGegevens.INST_KORTENAAM, dbo.InstellingGegevens.INST_VESTIGINGSNAAM,
dbo.InstellingGegevens.INST_ROEPNAAM, dbo.InstellingGegevens.INST_STATUUT, dbo.InstellingGegevens.ONDERWIJSNIVEAU_REF,
dbo.InstellingGegevens.ONDERWIJSSOORT_REF, dbo.InstellingGegevens.DATUM_TOT, dbo.InstellingGegevens.DATUM_VAN,
dbo.InstellingGegevens.VERBOND_REF, dbo.InstellingGegevens.VSKO_LID, dbo.InstellingGegevens.NET_REF, dbo.Instellingen.Inst_ID, dbo.Instellingen.INST_TYPE,
dbo.Instellingen.INST_REF, dbo.Instellingen.INST_LOC_REF, dbo.Instellingen.INST_LOCNR, dbo.Instellingen.Opt_KalStandaard, dbo.InstellingTelecom.INST_TEL,
dbo.InstellingTelecom.INST_FAX, dbo.InstellingTelecom.INST_EMAIL, dbo.InstellingTelecom.INST_WEB, dbo.InstellingAdressen.SOORT,
dbo.InstellingAdressen.STRAAT, dbo.InstellingAdressen.POSTCODE, dbo.InstellingAdressen.GEMEENTE, dbo.InstellingAdressen.GEM_REF,
dbo.InstellingAdressen.FUSIEGEM_REF, dbo.InstellingAdressen.FUSIEGEM, dbo.InstellingAdressen.ALFA_G, dbo.InstellingAdressen.PROVINCIE,
dbo.InstellingAdressen.BISDOM, dbo.InstellingAdressen.ARRONDISSEMENT, dbo.InstellingAdressen.GEWEST, dbo.InstellingLogin.Inst_Gebruikersnaam,
dbo.InstellingLogin.Inst_Concode, dbo.InstellingLogin.Inst_DirCode, dbo.InstellingLogin.DOSSNR, dbo.InstellingLogin.Instelling_ID,
dbo.InstellingContPersDirecteurs.AANSPREKING, dbo.InstellingContPersDirecteurs.CONTACTPERSOON, dbo.InstellingContPersDirecteurs.FUNCTIE
FROM dbo.InstellingGegevens RIGHT OUTER JOIN
dbo.Instellingen ON dbo.InstellingGegevens.INST_TYPE = dbo.Instellingen.INST_TYPE AND dbo.InstellingGegevens.INST_REF = dbo.Instellingen.INST_REF AND
dbo.InstellingGegevens.INST_LOC_REF = dbo.Instellingen.INST_LOC_REF AND
dbo.InstellingGegevens.INST_LOCNR = dbo.Instellingen.INST_LOCNR LEFT OUTER JOIN
dbo.InstellingTelecom ON dbo.InstellingGegevens.INST_TYPE = dbo.InstellingTelecom.INST_TYPE AND
dbo.InstellingGegevens.INST_REF = dbo.InstellingTelecom.INST_REF AND
dbo.InstellingGegevens.INST_LOC_REF = dbo.InstellingTelecom.INST_LOC_REF LEFT OUTER JOIN
dbo.InstellingAdressen ON dbo.InstellingGegevens.INST_TYPE = dbo.InstellingAdressen.INST_TYPE AND
dbo.InstellingGegevens.INST_REF = dbo.InstellingAdressen.INST_REF AND
dbo.InstellingGegevens.INST_LOC_REF = dbo.InstellingAdressen.INST_LOC_REF LEFT OUTER JOIN
dbo.InstellingLogin ON dbo.InstellingLogin.Inst_InstellingIKONType = dbo.Instellingen.INST_TYPE AND
dbo.InstellingLogin.Inst_InstellingIKON_REF = dbo.Instellingen.INST_REF AND dbo.InstellingLogin.Inst_Loc_REF = dbo.Instellingen.INST_LOC_REF AND
dbo.InstellingLogin.Inst_Loc_Nr = dbo.Instellingen.INST_LOCNR LEFT OUTER JOIN
dbo.InstellingContPersDirecteurs ON dbo.InstellingGegevens.INST_TYPE = dbo.InstellingContPersDirecteurs.INST_TYPE AND
dbo.InstellingGegevens.INST_REF = dbo.InstellingContPersDirecteurs.INST_REF AND
dbo.InstellingGegevens.INST_LOC_REF = dbo.InstellingContPersDirecteurs.INST_LOC_REF
WHERE (NOT (dbo.InstellingLogin.Inst_InstellingIKON_REF IS NULL))
所以问题是:
“应该是”PK 是 1 varchar 3 int钥匙。对于每个键,每个表中应该有 1 行,如图所示。这些键的“父级”是表 Instellingen
。该表是使用 InstellingenLogin
的distinct select
生成的,
真正的问题是 InstellingenLogin
中有大约 10 个双精度值(大约 5k 条记录),并且因此,某些行在视图中返回双精度,只有 InstellingLogin
的列不同。
我想要的是,如果 InstellingLogin
中有 2 行或更多行具有相同的密钥,则只有 1 行会显示(第一个行,...不重要,只显示 1 行)。
简而言之,这意味着对于 Instellingen 中的每条记录,我希望此视图中有 1 条记录。
有什么办法可以做到这一点吗?
Ok, so this is what i'm stuck with.
SELECT dbo.InstellingGegevens.INST_SUBTYPE, dbo.InstellingGegevens.INST_BRON, dbo.InstellingGegevens.INST_INSTELLINGSNUMMER,
dbo.InstellingGegevens.INST_NAAM, dbo.InstellingGegevens.INST_KORTENAAM, dbo.InstellingGegevens.INST_VESTIGINGSNAAM,
dbo.InstellingGegevens.INST_ROEPNAAM, dbo.InstellingGegevens.INST_STATUUT, dbo.InstellingGegevens.ONDERWIJSNIVEAU_REF,
dbo.InstellingGegevens.ONDERWIJSSOORT_REF, dbo.InstellingGegevens.DATUM_TOT, dbo.InstellingGegevens.DATUM_VAN,
dbo.InstellingGegevens.VERBOND_REF, dbo.InstellingGegevens.VSKO_LID, dbo.InstellingGegevens.NET_REF, dbo.Instellingen.Inst_ID, dbo.Instellingen.INST_TYPE,
dbo.Instellingen.INST_REF, dbo.Instellingen.INST_LOC_REF, dbo.Instellingen.INST_LOCNR, dbo.Instellingen.Opt_KalStandaard, dbo.InstellingTelecom.INST_TEL,
dbo.InstellingTelecom.INST_FAX, dbo.InstellingTelecom.INST_EMAIL, dbo.InstellingTelecom.INST_WEB, dbo.InstellingAdressen.SOORT,
dbo.InstellingAdressen.STRAAT, dbo.InstellingAdressen.POSTCODE, dbo.InstellingAdressen.GEMEENTE, dbo.InstellingAdressen.GEM_REF,
dbo.InstellingAdressen.FUSIEGEM_REF, dbo.InstellingAdressen.FUSIEGEM, dbo.InstellingAdressen.ALFA_G, dbo.InstellingAdressen.PROVINCIE,
dbo.InstellingAdressen.BISDOM, dbo.InstellingAdressen.ARRONDISSEMENT, dbo.InstellingAdressen.GEWEST, dbo.InstellingLogin.Inst_Gebruikersnaam,
dbo.InstellingLogin.Inst_Concode, dbo.InstellingLogin.Inst_DirCode, dbo.InstellingLogin.DOSSNR, dbo.InstellingLogin.Instelling_ID,
dbo.InstellingContPersDirecteurs.AANSPREKING, dbo.InstellingContPersDirecteurs.CONTACTPERSOON, dbo.InstellingContPersDirecteurs.FUNCTIE
FROM dbo.InstellingGegevens RIGHT OUTER JOIN
dbo.Instellingen ON dbo.InstellingGegevens.INST_TYPE = dbo.Instellingen.INST_TYPE AND dbo.InstellingGegevens.INST_REF = dbo.Instellingen.INST_REF AND
dbo.InstellingGegevens.INST_LOC_REF = dbo.Instellingen.INST_LOC_REF AND
dbo.InstellingGegevens.INST_LOCNR = dbo.Instellingen.INST_LOCNR LEFT OUTER JOIN
dbo.InstellingTelecom ON dbo.InstellingGegevens.INST_TYPE = dbo.InstellingTelecom.INST_TYPE AND
dbo.InstellingGegevens.INST_REF = dbo.InstellingTelecom.INST_REF AND
dbo.InstellingGegevens.INST_LOC_REF = dbo.InstellingTelecom.INST_LOC_REF LEFT OUTER JOIN
dbo.InstellingAdressen ON dbo.InstellingGegevens.INST_TYPE = dbo.InstellingAdressen.INST_TYPE AND
dbo.InstellingGegevens.INST_REF = dbo.InstellingAdressen.INST_REF AND
dbo.InstellingGegevens.INST_LOC_REF = dbo.InstellingAdressen.INST_LOC_REF LEFT OUTER JOIN
dbo.InstellingLogin ON dbo.InstellingLogin.Inst_InstellingIKONType = dbo.Instellingen.INST_TYPE AND
dbo.InstellingLogin.Inst_InstellingIKON_REF = dbo.Instellingen.INST_REF AND dbo.InstellingLogin.Inst_Loc_REF = dbo.Instellingen.INST_LOC_REF AND
dbo.InstellingLogin.Inst_Loc_Nr = dbo.Instellingen.INST_LOCNR LEFT OUTER JOIN
dbo.InstellingContPersDirecteurs ON dbo.InstellingGegevens.INST_TYPE = dbo.InstellingContPersDirecteurs.INST_TYPE AND
dbo.InstellingGegevens.INST_REF = dbo.InstellingContPersDirecteurs.INST_REF AND
dbo.InstellingGegevens.INST_LOC_REF = dbo.InstellingContPersDirecteurs.INST_LOC_REF
WHERE (NOT (dbo.InstellingLogin.Inst_InstellingIKON_REF IS NULL))
So here is the problem:
the 'should be' PK is a 1 varchar 3 int's key. for every key there is supposed to be 1 row in each of the tables which you can see in the image. the 'parent' of those keys is the table Instellingen
. This table is generated with a distinct select
of InstellingenLogin
the real problem is that there are about 10 doubles in InstellingenLogin
(of about 5k records) and because of this, some rows return double in the view, with only the columns of InstellingLogin
different.
what i want is that if there are 2 or more rows in InstellingLogin
with the same key, that only 1 will show (the first one,... doenst matter which one, just 1 will do).
in short that means that for every record in Instellingen
i want 1 record in this view.
is there any way to do that?
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我有点困惑,但我认为下面的答案应该说明如何实现您所需要的:
这基本上会加入 Instellingen 和 InstellingenLogin 但仅在找到的第一条记录上
I'm a bit confused but I think the answer below should illustrate how to acheive what you need:
This will basically join on Instellingen and InstellingenLogin but only on the first record found
您可以使用 DENSE_RANK 任意选择一行。基本上创建一个对 instellinglogin 进行排名的 CTE,然后仅选择排名为 1 的 CTE。棘手的一点是您有一个到 instellinglogin 的左连接,因此您需要像这样在左连接内执行内部连接。我还保留了连接条件作为要分区的列。这可能不正确。
下面是完整的 SQL
You can use DENSE_RANK to Arbitrarily select a row. Basically create a CTE that ranks the instellinglogin and then only select the one with a Rank of 1. The tricky bit is that you have a left join to instellinglogin so you'll need to do the inner join inside the left join like so. Also I kept the Join condition as the the columns to partition. This may not be correct.
Here's the complete SQL Below
您需要将
InstellingenLogin
包装在某种聚合中以删除重复项,然后连接到结果 - 您可以使用子查询来完成此操作。您可以使用MIN()
或MAX()
执行GROUP BY
来选择一个值,也可以执行ROW_NUMBER() OVER (ORDER BY some_criteria PARTIION BY your_key)
并选择第一行。另外,我建议在表上使用别名 - 使其更具可读性
You need to wrap
InstellingenLogin
in some kind of aggregate to remove the duplicates and then join to the result - you can do this with a subquery. You could do aGROUP BY
withMIN()
orMAX()
to pick a value or you could doROW_NUMBER() OVER (ORDER BY some_criteria PARTIION BY your_key)
and pick the first row.Also, I recommend using aliases on your tables - makes it far more readable
或者,您可以将查询中的 IntellingLogin 表替换为派生表,例如:
并添加连接条件:A.RN = 1
Or you could substitute the IntellingLogin table in the query with a derived table such as:
and add in the join condition: A.RN = 1