我想每个ID只返回一行，即使有多个行与ID相关联。
情景是数据反映了销售土地/房产的网站，并且对于每个列表，可能存在与每个ID相关联的多个图像。我只需要一个。
谢谢。
根据要求，样本数据：
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
我正在构建的Omni查询我将替换几百行临时表：
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
查询本身当然还没有完成。
答案 0 :(得分：1)
如果您的SQLServer版本支持row_number() OVER（2008,2012支持）
select * from
(select t.*,
row_number() over (partition by id order by id) as rownumber from t
) t1
where t1.rownumber=1
答案 1 :(得分：0)
由于没有样本数据，您需要弯曲此响应以满足您的需求
select
Listings.*, SingleImage.Column1, SingleImage.Column2
from Listings
cross apply (
select top 1 *
from Images
where Listings.ListingID = Images.ListingID
) SingleImage
需要SQL 2005或更新版本（用于“交叉应用”）
有一些方法可以使它在SQL 2000中运行，但它们效率不高
答案 2 :(得分：0)
试试这个：
SELECT TOP 1 * FROM
imagestable
WHERE imagestable.landID = <theID>
这将返回属于该属性的表中的第一个图像。
如果要将所有属性信息作为单个记录返回，可以使用属性表INNER JOIN此查询。
答案 3 :(得分：0)
在SQL Server 2005+中，您可以使用此
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