1

IDに複数の行が関連付けられている場合でも、IDごとに1つの行のみを取得したいと思います。

シナリオは、データが土地/不動産を販売するサイトを反映しており、リストごとに、各IDに関連付けられた複数の画像が存在する可能性があるというものです。必要なのは1つだけです。

ありがとうございました。

要求に応じて、サンプルデータ：

RowNumber   ID  UserID  CountryID   tbl_detailsID   Name    Description Price   AddressLine1    AddressLine2    City    State   Zip AddressGPS  Space   Amenities   Policies    URL DateEntered DateExpires NumViews    IsCompanyProperty   EnforceMinStay  IsOtherSite rate_Avg    isFeatured  DayPrice    ImageURL    Name    check_in    check_out   currency    bathroom_count  pet unit_size   elder   handicap    occupancy   bedroom_count   LinkURL smoking unit_size_Units property_Type   children    Minimum_stay    Minimum_stay_Unit   CountryName
2   247586  1   1   161398  Beautiful Oceanfront Home in Cambria California Located on the Central Coast of California 10 minutes from Hearst Castle.
Phone 1: Toll Free (800) 240-2277
Phone 2: (805) 927-0306 (California, USA)
direct email contact: debbie (@) maisonsdecambria.com

Leopold Cove" is a beautiful Oceanfront Home located on the Central Coast of California. It has fabulous ocean views and access to the water from a private stairway. The living area has large plate glass windows that feature 180 degree views of the Pacific Ocean. A comfortable platform style bed & a warm, cozy fireplace are also located in the living area so you can relax for hours, or even days, enjoying the beauty that surrounds you. There is a full kitchen & a separate bedroom with 2 twin beds. The property also has a picnic area & places to sit, perhaps with a good book & a glass of wine while you watch the sunset. If you are a nature lover, you will enjoy the otters, seals & birdlife that we are privileged to have so close to us. During the gray whale migration times, this is a p     2183 Sherwood Drive     Cambria California  93428   35.544712|-121.095444               http://www.flipkey.com/cambria-vacation-rentals/p202618/    2012-10-01 10:52:00 2012-10-15 10:52:00 0   0   0   703 5.0 0   NULL    http://images1.flipkey.com/img/photos/302459/243298/large_302459-243298-007-1346943508.jpg  Beautiful Oceanfront Home in Cambria California         USD 1   Ask 0   Ask Ask 4   1   http://www.flipkey.com/cambria-vacation-rentals/p202618/    Ask     House   Ask 0   NULL    United States
3   247586  1   1   161398  Beautiful Oceanfront Home in Cambria California Located on the Central Coast of California 10 minutes from Hearst Castle.
Phone 1: Toll Free (800) 240-2277
Phone 2: (805) 927-0306 (California, USA)
direct email contact: debbie (@) maisonsdecambria.com

Leopold Cove" is a beautiful Oceanfront Home located on the Central Coast of California. It has fabulous ocean views and access to the water from a private stairway. The living area has large plate glass windows that feature 180 degree views of the Pacific Ocean. A comfortable platform style bed & a warm, cozy fireplace are also located in the living area so you can relax for hours, or even days, enjoying the beauty that surrounds you. There is a full kitchen & a separate bedroom with 2 twin beds. The property also has a picnic area & places to sit, perhaps with a good book & a glass of wine while you watch the sunset. If you are a nature lover, you will enjoy the otters, seals & birdlife that we are privileged to have so close to us. During the gray whale migration times, this is a p     2183 Sherwood Drive     Cambria California  93428   35.544712|-121.095444               http://www.flipkey.com/cambria-vacation-rentals/p202618/    2012-10-01 10:52:00 2012-10-15 10:52:00 0   0   0   703 5.0 0   NULL    http://images1.flipkey.com/img/photos/302459/243298/large_302459-243298-006-1346943508.jpg  Beautiful Oceanfront Home in Cambria California         USD 1   Ask 0   Ask Ask 4   1   http://www.flipkey.com/cambria-vacation-rentals/p202618/    Ask     House   Ask 0   NULL    United States
4   247586  1   1   161398  Beautiful Oceanfront Home in Cambria California Located on the Central Coast of California 10 minutes from Hearst Castle.
Phone 1: Toll Free (800) 240-2277
Phone 2: (805) 927-0306 (California, USA)
direct email contact: debbie (@) maisonsdecambria.com

Leopold Cove" is a beautiful Oceanfront Home located on the Central Coast of California. It has fabulous ocean views and access to the water from a private stairway. The living area has large plate glass windows that feature 180 degree views of the Pacific Ocean. A comfortable platform style bed & a warm, cozy fireplace are also located in the living area so you can relax for hours, or even days, enjoying the beauty that surrounds you. There is a full kitchen & a separate bedroom with 2 twin beds. The property also has a picnic area & places to sit, perhaps with a good book & a glass of wine while you watch the sunset. If you are a nature lover, you will enjoy the otters, seals & birdlife that we are privileged to have so close to us. During the gray whale migration times, this is a p     2183 Sherwood Drive     Cambria California  93428   35.544712|-121.095444               http://www.flipkey.com/cambria-vacation-rentals/p202618/    2012-10-01 10:52:00 2012-10-15 10:52:00 0   0   0   703 5.0 0   NULL    http://images1.flipkey.com/img/photos/302459/243298/large_302459-243298-005-1346943508.jpg  Beautiful Oceanfront Home in Cambria California         USD 1   Ask 0   Ask Ask 4   1   http://www.flipkey.com/cambria-vacation-rentals/p202618/    Ask     House   Ask 0   NULL    United States
5   247586  1   1   161398  Beautiful Oceanfront Home in Cambria California Located on the Central Coast of California 10 minutes from Hearst Castle.
Phone 1: Toll Free (800) 240-2277
Phone 2: (805) 927-0306 (California, USA)
direct email contact: debbie (@) maisonsdecambria.com

Leopold Cove" is a beautiful Oceanfront Home located on the Central Coast of California. It has fabulous ocean views and access to the water from a private stairway. The living area has large plate glass windows that feature 180 degree views of the Pacific Ocean. A comfortable platform style bed & a warm, cozy fireplace are also located in the living area so you can relax for hours, or even days, enjoying the beauty that surrounds you. There is a full kitchen & a separate bedroom with 2 twin beds. The property also has a picnic area & places to sit, perhaps with a good book & a glass of wine while you watch the sunset. If you are a nature lover, you will enjoy the otters, seals & birdlife that we are privileged to have so close to us. During the gray whale migration times, this is a p     2183 Sherwood Drive     Cambria California  93428   35.544712|-121.095444               http://www.flipkey.com/cambria-vacation-rentals/p202618/    2012-10-01 10:52:00 2012-10-15 10:52:00 0   0   0   703 5.0 0   NULL    http://images1.flipkey.com/img/photos/302459/243298/large_302459-243298-004-1346943508.jpg  Beautiful Oceanfront Home in Cambria California         USD 1   Ask 0   Ask Ask 4   1   http://www.flipkey.com/cambria-vacation-rentals/p202618/    Ask     House   Ask 0   NULL    United States
6   247586  1   1   161398  Beautiful Oceanfront Home in Cambria California Located on the Central Coast of California 10 minutes from Hearst Castle.
Phone 1: Toll Free (800) 240-2277
Phone 2: (805) 927-0306 (California, USA)
direct email contact: debbie (@) maisonsdecambria.com

Leopold Cove" is a beautiful Oceanfront Home located on the Central Coast of California. It has fabulous ocean views and access to the water from a private stairway. The living area has large plate glass windows that feature 180 degree views of the Pacific Ocean. A comfortable platform style bed & a warm, cozy fireplace are also located in the living area so you can relax for hours, or even days, enjoying the beauty that surrounds you. There is a full kitchen & a separate bedroom with 2 twin beds. The property also has a picnic area & places to sit, perhaps with a good book & a glass of wine while you watch the sunset. If you are a nature lover, you will enjoy the otters, seals & birdlife that we are privileged to have so close to us. During the gray whale migration times, this is a p     2183 Sherwood Drive     Cambria California  93428   35.544712|-121.095444               http://www.flipkey.com/cambria-vacation-rentals/p202618/    2012-10-01 10:52:00 2012-10-15 10:52:00 0   0   0   703 5.0 0   NULL    http://images1.flipkey.com/img/photos/302459/243298/large_302459-243298-003-1346943508.jpg  Beautiful Oceanfront Home in Cambria California         USD 1   Ask 0   Ask Ask 4   1   http://www.flipkey.com/cambria-vacation-rentals/p202618/    Ask     House   Ask 0   NULL    United States
7   247586  1   1   161398  Beautiful Oceanfront Home in Cambria California Located on the Central Coast of California 10 minutes from Hearst Castle.
Phone 1: Toll Free (800) 240-2277
Phone 2: (805) 927-0306 (California, USA)
direct email contact: debbie (@) maisonsdecambria.com

Leopold Cove" is a beautiful Oceanfront Home located on the Central Coast of California. It has fabulous ocean views and access to the water from a private stairway. The living area has large plate glass windows that feature 180 degree views of the Pacific Ocean. A comfortable platform style bed & a warm, cozy fireplace are also located in the living area so you can relax for hours, or even days, enjoying the beauty that surrounds you. There is a full kitchen & a separate bedroom with 2 twin beds. The property also has a picnic area & places to sit, perhaps with a good book & a glass of wine while you watch the sunset. If you are a nature lover, you will enjoy the otters, seals & birdlife that we are privileged to have so close to us. During the gray whale migration times, this is a p     2183 Sherwood Drive     Cambria California  93428   35.544712|-121.095444               http://www.flipkey.com/cambria-vacation-rentals/p202618/    2012-10-01 10:52:00 2012-10-15 10:52:00 0   0   0   703 5.0 0   NULL    http://images1.flipkey.com/img/photos/302459/243298/large_302459-243298-002-1346943508.jpg  Beautiful Oceanfront Home in Cambria California         USD 1   Ask 0   Ask Ask 4   1   http://www.flipkey.com/cambria-vacation-rentals/p202618/    Ask     House   Ask 0   NULL    United States
8   247586  1   1   161398  Beautiful Oceanfront Home in Cambria California Located on the Central Coast of California 10 minutes from Hearst Castle.
Phone 1: Toll Free (800) 240-2277
Phone 2: (805) 927-0306 (California, USA)
direct email contact: debbie (@) maisonsdecambria.com

Leopold Cove" is a beautiful Oceanfront Home located on the Central Coast of California. It has fabulous ocean views and access to the water from a private stairway. The living area has large plate glass windows that feature 180 degree views of the Pacific Ocean. A comfortable platform style bed & a warm, cozy fireplace are also located in the living area so you can relax for hours, or even days, enjoying the beauty that surrounds you. There is a full kitchen & a separate bedroom with 2 twin beds. The property also has a picnic area & places to sit, perhaps with a good book & a glass of wine while you watch the sunset. If you are a nature lover, you will enjoy the otters, seals & birdlife that we are privileged to have so close to us. During the gray whale migration times, this is a p     2183 Sherwood Drive     Cambria California  93428   35.544712|-121.095444               http://www.flipkey.com/cambria-vacation-rentals/p202618/    2012-10-01 10:52:00 2012-10-15 10:52:00 0   0   0   703 5.0 0   NULL    http://images1.flipkey.com/img/photos/302459/243298/large_302459-243298-001-1346943508.jpg  Beautiful Oceanfront Home in Cambria California         USD 1   Ask 0   Ask Ask 4   1   http://www.flipkey.com/cambria-vacation-rentals/p202618/    Ask     House   Ask 0   NULL    United States

そして、数百行の一時テーブルを置き換えるために構築しているオムニクエリI：

SELECT DISTINCT ROW_NUMBER() OVER(ORDER BY tbl_Properties.ID DESC) AS [RowNumber], tbl_Properties.ID, tbl_Properties.UserID, tbl_Properties.CountryID, tbl_Properties.tbl_detailsID, tbl_Properties.Name, 
tbl_Properties.[Description], tbl_Properties.Price, tbl_Properties.AddressLine1, tbl_Properties.AddressLine2, tbl_Properties.City, tbl_Properties.[State], tbl_Properties.Zip, tbl_Properties.AddressGPS,
 tbl_Properties.[Space],
 tbl_Properties.Amenities,
 tbl_Properties.Policies,
 tbl_Properties.URL,
 tbl_Properties.DateEntered,
 tbl_Properties.DateExpires,
 tbl_Properties.NumViews,
 tbl_Properties.IsCompanyProperty,
 tbl_Properties.EnforceMinStay,
 tbl_Properties.IsOtherSite,
 tbl_Properties.rate_Avg,
 tbl_Properties.isFeatured,
 tbl_Properties.DayPrice,
 tbl_Images.ImageURL,
 tbl_Details.Name,
 tbl_Details.check_in,
 tbl_Details.check_out,
 tbl_Details.currency,
 tbl_Details.bathroom_count,
 tbl_Details.pet,
 tbl_Details.unit_size,
 tbl_Details.elder,
 tbl_Details.handicap,
 tbl_Details.occupancy,
 tbl_Details.bedroom_count,
 tbl_Details.url As [LinkURL],
 tbl_Details.smoking,
 tbl_Details.unit_size_Units,
 tbl_Details.property_Type,
 tbl_Details.children,
tbl_Details.Minimum_stay,
tbl_Details.Minimum_stay_Unit,
 tbl_Countries.Name As [CountryName]
 FROM [tbl_Details] 
 INNER JOIN [tbl_Properties] ON [tbl_Details].[detailsID] = [tbl_Properties].[tbl_detailsID]
 INNER JOIN [tbl_Images] ON [tbl_Images].PropertyID = [tbl_Properties].ID
 INNER JOIN [tbl_Countries] ON [tbl_Countries].ID = [tbl_Properties].CountryID

もちろん、クエリ自体はまだ完了していません。

4

4 に答える 4

1

SQLServerバージョンがrow_number（）OVERをサポートしている場合（2008、2012サポート）

select * from 
(select t.*, 
  row_number() over (partition by id order by id) as rownumber from t
) t1
where t1.rownumber=1

これがSQLFiddleの例です

于 2012-11-28T07:15:53.737 に答える
0

サンプルデータがないため、ニーズに合わせてこの応答を曲げる必要があります

select 
  Listings.*, SingleImage.Column1, SingleImage.Column2
from Listings
  cross apply (
    select top 1 *
    from Images
    where Listings.ListingID = Images.ListingID
    ) SingleImage

SQL 2005以降が必要です（「相互適用」が機能するには）

SQL 2000でも機能させる方法はありますが、それほど効率的ではありません。

于 2012-11-28T07:05:39.347 に答える
0

これを試して：

SELECT TOP 1 * FROM
imagestable
WHERE imagestable.landID = <theID>

これにより、プロパティに属するテーブルの最初の画像が返されます。

すべてのプロパティ情報を単一のレコードとして返したい場合は、このクエリをプロパティテーブルと内部結合できます。

于 2012-11-28T07:08:15.427 に答える
0

SQL Server 2005+あなたはこれを使うことができます

use tempdb
go

create table tbl (id int, s varchar(50))
insert into tbl values (1,'qwe'),(1,'asd'), (1,'qwff'),(2,'ert'),(2,'ykf'),(3,'')

;with cte
AS
(
SELECT id,s, ROW_NUMBER() OVER (PARTITION BY id ORDER BY s ) n
FROM tbl
)
SELECT id,s
FROM CTE
WHERE n=1

drop table tbl
于 2012-11-28T07:11:09.423 に答える