请查看以下查询:
tbl_Contents
Content_Id Content_Title Content_Text
10002 New case Study New case Study
10003 New case Study New case Study
10004 New case Study New case Study
10005 New case Study New case Study
10006 New case Study New case Study
10007 New case Study New case Study
10008 New case Study New case Study
10009 New case Study New case Study
10010 SEO News Title SEO News Text
10011 SEO News Title SEO News Text
10012 Publish Contents SEO News …我使用包含视图的实体框架.我有疑问:
var data = this.context.vwRevenues
.Where(x => x.revenue >= 0);
.OrderByDescending(x => x.year)
.ThenByDescending(x => x.month)
.Take(10)
.ToList();
此查询返回实体集,但第一个实体等于第5个.
data[0] == data[4] // true
我从sql tracer获取此查询的sql脚本并将其运行到SQL Management Studio中,它返回不同的记录.
我有一个带有重复元素的向量,并希望将它们删除,以便每个元素只出现一次.
在Python中,我可以Set用向量构造一个来实现这个,但是我怎么能在R中做到这一点？
我的表中有重复的行,我想以最有效的方式删除重复项,因为表很大.经过一番研究,我得出了这个问题:
WITH TempEmp AS
(
SELECT name, ROW_NUMBER() OVER(PARTITION by name, address, zipcode ORDER BY name) AS duplicateRecCount
FROM mytable
)
-- Now Delete Duplicate Records
DELETE FROM TempEmp
WHERE duplicateRecCount > 1;
但它只适用于SQL,而不适用于Netezza.它似乎不喜欢DELETE后面的WITH条款？
我有一个数据框,其中包含两列(A和B)的重复值:
A B C
1 2 1
1 2 4
2 7 1
3 4 0
3 4 8
我想删除重复项,在C列中保留行的最大值.这将导致:
A B C
1 2 4
2 7 1
3 4 8
我无法弄清楚如何做到这一点.我应该使用drop_duplicates()其他什么吗？
假设我有一个重复值的链接列表如下:
<a href="#">Book</a>
<a href="#">Magazine</a>
<a href="#">Book</a>
<a href="#">Book</a>
<a href="#">DVD</a>
<a href="#">DVD</a>
<a href="#">DVD</a>
<a href="#">Book</a>
我将如何使用JQuery删除重复项,并留下以下内容,例如:
<a href="#">Book</a>
<a href="#">Magazine</a>
<a href="#">DVD</a>
基本上我正在寻找一种方法来删除找到的任何重复值并显示每个链接1.
这是我在编译时收到的错误消息...
Ld /Users/ilia3546/Library/Developer/Xcode/DerivedData/MasterDetail-fhgogwnbpzovbtaskgecptdnvgjs/Build/Products/Debug-iphonesimulator/MasterDetail.app/MasterDetail normal i386
cd /Users/ilia3546/???????/iDecide
setenv IPHONEOS_DEPLOYMENT_TARGET 5.0
setenv PATH "/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch i386 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.0.sdk -L/Users/ilia3546/Library/Developer/Xcode/DerivedData/MasterDetail-fhgogwnbpzovbtaskgecptdnvgjs/Build/Products/Debug-iphonesimulator -F/Users/ilia3546/Library/Developer/Xcode/DerivedData/MasterDetail-fhgogwnbpzovbtaskgecptdnvgjs/Build/Products/Debug-iphonesimulator -filelist /Users/ilia3546/Library/Developer/Xcode/DerivedData/MasterDetail-fhgogwnbpzovbtaskgecptdnvgjs/Build/Intermediates/MasterDetail.build/Debug-iphonesimulator/MasterDetail.build/Objects-normal/i386/MasterDetail.LinkFileList -Xlinker -objc_abi_version -Xlinker 2 -fobjc-link-runtime -Xlinker -no_implicit_dylibs -mios-simulator-version-min=5.0 -framework UIKit -framework Foundation -framework CoreGraphics -o /Users/ilia3546/Library/Developer/Xcode/DerivedData/MasterDetail-fhgogwnbpzovbtaskgecptdnvgjs/Build/Products/Debug-iphonesimulator/MasterDetail.app/MasterDetail
duplicate symbol _main in:
/Users/ilia3546/Library/Developer/Xcode/DerivedData/MasterDetail-fhgogwnbpzovbtaskgecptdnvgjs/Build/Intermediates/MasterDetail.build/Debug-iphonesimulator/MasterDetail.build/Objects-normal/i386/main-E0BAF2CA88EDEE32.o
duplicate symbol _OBJC_IVAR_$_MasterDetailAppDelegate._window in:
/Users/ilia3546/Library/Developer/Xcode/DerivedData/MasterDetail-fhgogwnbpzovbtaskgecptdnvgjs/Build/Intermediates/MasterDetail.build/Debug-iphonesimulator/MasterDetail.build/Objects-normal/i386/MasterDetailAppDelegate-C2C06F734ECE2E36.o
duplicate symbol _OBJC_IVAR_$_MasterDetailAppDelegate._navigationController in:
/Users/ilia3546/Library/Developer/Xcode/DerivedData/MasterDetail-fhgogwnbpzovbtaskgecptdnvgjs/Build/Intermediates/MasterDetail.build/Debug-iphonesimulator/MasterDetail.build/Objects-normal/i386/MasterDetailAppDelegate-C2C06F734ECE2E36.o
duplicate symbol _OBJC_IVAR_$_MasterDetailAppDelegate._splitViewController in:
/Users/ilia3546/Library/Developer/Xcode/DerivedData/MasterDetail-fhgogwnbpzovbtaskgecptdnvgjs/Build/Intermediates/MasterDetail.build/Debug-iphonesimulator/MasterDetail.build/Objects-normal/i386/MasterDetailAppDelegate-C2C06F734ECE2E36.o
duplicate symbol _OBJC_CLASS_$_MasterDetailAppDelegate in:
/Users/ilia3546/Library/Developer/Xcode/DerivedData/MasterDetail-fhgogwnbpzovbtaskgecptdnvgjs/Build/Intermediates/MasterDetail.build/Debug-iphonesimulator/MasterDetail.build/Objects-normal/i386/MasterDetailAppDelegate-C2C06F734ECE2E36.o
duplicate symbol _OBJC_METACLASS_$_MasterDetailAppDelegate in:
/Users/ilia3546/Library/Developer/Xcode/DerivedData/MasterDetail-fhgogwnbpzovbtaskgecptdnvgjs/Build/Intermediates/MasterDetail.build/Debug-iphonesimulator/MasterDetail.build/Objects-normal/i386/MasterDetailAppDelegate-C2C06F734ECE2E36.o
duplicate symbol _OBJC_IVAR_$_MasterDetailDetailViewController._detailItem in:
/Users/ilia3546/Library/Developer/Xcode/DerivedData/MasterDetail-fhgogwnbpzovbtaskgecptdnvgjs/Build/Intermediates/MasterDetail.build/Debug-iphonesimulator/MasterDetail.build/Objects-normal/i386/MasterDetailDetailViewController-B3C32DC7B1BE4E38.o
duplicate symbol _OBJC_IVAR_$_MasterDetailDetailViewController._TitleOfDetail in:
/Users/ilia3546/Library/Developer/Xcode/DerivedData/MasterDetail-fhgogwnbpzovbtaskgecptdnvgjs/Build/Intermediates/MasterDetail.build/Debug-iphonesimulator/MasterDetail.build/Objects-normal/i386/MasterDetailDetailViewController-B3C32DC7B1BE4E38.o
duplicate symbol …有没有办法检测视频中的重复帧ffmpeg.
我尝试用-vf旗帜select=gt(scene\,0.xxx)改变场景.但是,它对我的情况不起作用.
如何让php数组有重复键？当我尝试插入一个键,具有已存在键的值对时,它会用新值覆盖相应前一个键的值.有没有办法可以维护两个具有不同值的重复键？
这是我应该重复5次的数据框:
>>> x = pd.DataFrame({'a':1,'b':2},index = range(1))
>>> x
a b
0 1 2
我想得到这样的结果:
>>> x.append(x).append(x).append(x)
a b
0 1 2
0 1 2
0 1 2
0 1 2
但是必须有一种比继续追加更聪明的方法..实际上我正在研究的数据框应该重复50次.
我还没有找到任何实用的东西,包括那些像np.repeat----它只是在数据框架上工作.
有人可以帮忙吗？