MS 服务器插入 IF 和 GeoLocation

Question

我在 MS Server 中有 3 个 table。 1：包含所有美国邮政编码和这些邮政编码的地理定位。 2：包含商店和地理位置数据。 3：告诉我邮政编码和最近的商店之间的距离（以英里为单位）。如果邮编在营业地点的 50 英里范围内。将数据插入 table 3 的脚本是：

declare @zip varchar (10);
declare @RangeInMiles int
set @RangeInMiles = 50

declare zip_cursor CURSOR FOR
Select ZipCode from dimZip;

OPEN zip_cursor;

FETCH NEXT FROM zip_cursor
INTO @zip;

WHILE @@FETCH_STATUS = 0
BEGIN

declare @geo geography
set @geo = (select z.GeographyLocation
        from dimZip z
        where z.ZipCode = @zip)


--Select the nearest Postal Codes
INSERT INTO dimZipToStore
(ZipCode, ZipStateID, StoreID, StoreState, DistanceInMiles)
SELECT top 1 dz.ZipCode, dz.StateID, ld.StoreID, l.StoreState, 
ld.GeographyLocation.STDistance(@geo)/1609.34 as DistanceInMiles 
--1609.344 meteres in mile
FROM dimZip dz
cross join dimLocationDetail ld
join dimlocation l on l.StoreID = ld.StoreID  
WHERE ld.GeographyLocation is not null
and dz.ZipCode = @zip 
and ld.GeographyLocation.STDistance(@geo)<=(@RangeInMiles * 1609.344)
order by DistanceInMiles

FETCH NEXT FROM zip_cursor  
INTO @zip;  
END  
CLOSE zip_cursor;
DEALLOCATE zip_Cursor;
GO

这非常有效。但是，现在我必须创建一个更新脚本，我们将每 3 个月左右运行一次。这适用于新店、关店或搬家。它必须做的是 INSERT （作为新行）如果数据已更改，则将新数据添加到旧条目（此列已存在于 table 3 中）。我已经浏览了整个网络，但找不到任何东西。我对 Tsql 还是新手，可能错过了解决方案。非常感谢任何 leads/help。谢谢。

根据要求添加：

 CREATE TABLE dimZipToStore(
  ZipCode varchar (10),
    ZipStateID varchar (2),
    StoreID varchar (5),
    StoreState varchar (3),
    DistanceInMiles FLOAT,
    CreateDate DateTime not null default (GetDate()),
    ExipiredDate Datetime       
    )

在将上述游标重新运行为临时文件后，我可能找到了插入的解决方案Table:

 INSERT INTO dimZipToStore
 (ZipCode, ZipStateID, StoreID, StoreState, DistanceInMiles)
 select * from(
 select ZipCode, ZipStateID, StoreID, StoreState, DistanceInMiles
 from #tempDimZipToStore TZ
 EXCEPT
 select ZipCode, ZipStateID,    StoreID, StoreState, DistanceInMiles 
 from dimZipToStore Z)
 where TZ.DistanceInMiles < Z.DistanceInMiles

这是正确的吗？在弄清楚如何更新旧条目的 expiredDate 列时仍然存在问题。

Answer 1

我认为您需要类似于以下内容的内容。请查看并根据您的需要进行调整。这些语句假定您的临时 table.

中已有新的、更新的记录

-- Insert new stores if there isn't one currently by zip code and distance is no more than 50 miles
 INSERT INTO dimZipToStore (
    ZipCode,
    ZipStateID,
    StoreID,
    StoreState,
    DistanceInMiles)
SELECT
    ZipCode = N.ZipCode,
    ZipStateID = N.ZipStateID,
    StoreID = N.StoreID,
    StoreState = N.StoreState,
    DistanceInMiles = N.DistanceInMiles
FROM
    #tempDimZipToStore AS N
WHERE
    N.DistanceInMiles <= 50 AND
    NOT EXISTS (
        SELECT
            'there is currently no store for this zip code'
        FROM
            dimZipToStore AS O
        WHERE
            N.ZipCode = O.ZipCode)


 -- Insert the new, closer store (just the closest one)
;WITH DistanceRankingsByZipCode AS
(
    SELECT
        N.ZipCode,
        N.ZipStateID,
        N.StoreID,
        N.StoreState,
        N.DistanceInMiles,
        DistanceRankingByZipCode = ROW_NUMBER() OVER (PARTITION BY N.ZipCode ORDER BY N.DistanceInMiles ASC)
    FROM
        #tempDimZipToStore AS N
)
INSERT INTO dimZipToStore (
    ZipCode,
    ZipStateID,
    StoreID,
    StoreState,
    DistanceInMiles)
SELECT
    ZipCode = N.ZipCode,
    ZipStateID = N.ZipStateID,
    StoreID = N.StoreID,
    StoreState = N.StoreState,
    DistanceInMiles = N.DistanceInMiles
FROM
    DistanceRankingsByZipCode AS N
WHERE
    N.DistanceRankingByZipCode = 1 AND
    EXISTS (
        SELECT
            'there is currently a farther active store for the same zip code'
        FROM
            dimZipToStore AS O
        WHERE
            N.ZipCode = O.ZipCode AND
            N.DistanceInMiles < O.DistanceInMiles AND
            O.ExpiredDate IS NULL)



-- Update old record if a closer store exists (it's now on the same table)
;WITH MinDistanceByZipCode AS
(
    SELECT
        D.ZipCode,
        MinDistanceInMiles = MIN(D.DistanceInMiles)
    FROM
        dimZipToStore AS D
    GROUP BY
        D.ZipCode
)
UPDATE O SET
    ExipiredDate = GETDATE()
FROM
    dimZipToStore AS O
    INNER JOIN MinDistanceByZipCode AS C ON O.ZipCode = C.ZipCode
WHERE
    O.ExpiredDate IS NULL AND
    O.DistanceInMiles > C.MinDistanceInMiles

在第二条语句中，我们使用函数 ROW_NUMBER() 生成从 1 开始的递增排名（没有关系），当 PARTITION BY 列的值发生变化时，它会重置回 1，并按 ORDER BY 中的列排序。因此，这个特定的行号将为每个不同邮政编码具有最小距离的商店提供值 1，为第二近的商店提供 2，依此类推。我相信您只需要最近的活动记录，因此我们在插入之前按此排名过滤 N.DistanceRankingByZipCode = 1。

MS 服务器插入 IF 和 GeoLocation

MS Server Insert IF and GeoLocation

tsql

sql-server

insert-update