#DISTINCT

ORA-13347: the coordinates defining an arc are not distinct

文档解释ORA-13347:thecoordinatesdefininganarcarenotdistinctCause:Twoormoreofthethreepointsdefininganarcarethesame.Action:Alterthedefinitionofthearctoensurethatthree...

ORA-40108: input data contains too few distinct target (string) values

文档解释ORA-40108:inputdatacontainstoofewdistincttarget(string)valuesCause:AtleasttwodistincttargetvaluesarerequiredforBuild.Action:Providecounter-exampletargetvalu...

ORA-40113: insufficient number of distinct target values

文档解释ORA-40113:insufficientnumberofdistincttargetvaluesCause:Lessthantwodistincttargetvalueswerefoundinthebuilddata.Action:Providetheclassificationbuilddatawithv...

ORA-14011: names assigned to resulting partitions must be distinct

文档解释ORA-14011:namesassignedtoresultingpartitionsmustbedistinctCause:NamesofpartitionsresultingfromsplittingofanexistingtableorindexpartitionarenotdistinctAction...

ORA-40323: Attribute string has too many distinct values (string)

文档解释ORA-40323:Attributestringhastoomanydistinctvalues(string)Cause:Exceededmaximumnumberofdistinctvaluesallowedinanattribute.Action:Binnumericaldatawithfewertha...

ORA-40027: Target attribute has more than two distinct values

文档解释ORA-40027:TargetattributehasmorethantwodistinctvaluesCause:GeneralizedLinearModelsonlysupportbinaryclassification.Action:Consolidatetargetvaluesintotwodisti...

ORA-02014: cannot select FOR UPDATE from view with DISTINCT, GROUP BY, etc.

文档解释ORA-02014:cannotselectFORUPDATEfromviewwithDISTINCT,GROUPBY,etc.Cause:AnattemptwasmadetoselectFORUPDATEfromaviewwhichhadnotbeenmergedbecausetheviewusedsynta...

ORA-01415: too many distinct aggregate functions

文档解释ORA-01415:toomanydistinctaggregatefunctionsCause:Thequerycontainsmoredistinctaggregatesthancanbeprocessed.Thecurrentlimitis255.Action:Reducethenumberofdisti...

C# Linq 去重-Select、Distinct 对唯一性的认定

C#Linq去重-Select、Distinct对唯一性的认定C#Linq去重-GroupBy、Select巧对类去重看代码public class C{public int Id { get; set; }public stri...

Rxjava2的操作符Filter、Debounce 、DistinctUntilChanged 、SwitchMap 的使用

publicclassRxSearchObservable{publicstaticObservable<String>fromView(SearchViewsearchView){      //Subject的理解看这里https://www.cnblogs.com/yongfengnice/p/102...

hive中groupby和distinct区别以及性能比较

Hive去重统计先说核心:都会在map阶段count,但reduce阶段,distinct只有一个,groupby可以有多个进行并行聚合,所以groupby会快。 经常在公司还能看到。很多老人用distinct去重,很容易数据量大的时候的数据倾斜。感谢上次冲哥的指正。相信使用Hive的人平时会经常用到去重统计...

LINQ标准查询操作符(三)——Aggregate、Average、Distinct、Except、Intersect、Union、Empty、DefaultIfEmpty、Range、Repeat

聚合函数将在序列上执行特定的计算,并返回单个值,如计算给定序列平均值、最大值等。共有7种LINQ聚合查询操作符:Aggregate、Average、Count、LongCount、Max、Min和Sum。Aggregate操作符对集合值执行自定义聚合运算。例如,需要列出所有产品类别清单,每个类别名称之间用顿号连接。以下...

SQL DISTINCT 用法(去重)

现在以下数据查有出现的TeacherId 1SELECTTeacherIDFROMStudentViewCode结果有重复的ID出现确实查法:1SELECTTeacherIDFROMStudent2GROUPBYTeacherIDViewCode1SELECTDISTINCTTeacherIDFROMStud...
代码星球 ·2021-02-15

SQL SELECT DISTINCT 语句

在表中,可能会包含重复值。这并不成问题,不过,有时您也许希望仅仅列出不同(distinct)的值。关键词DISTINCT用于返回唯一不同的值。语法:SELECTDISTINCT列名称FROM表名称如果要从"Company"列中选取所有的值,我们需要使用SELECT语句:SELECTCompanyFROMOrders...
代码星球 ·2021-02-11

使用distinct出现的一个问题

如果指定了SELECTDISTINCT,那么ORDERBY子句中的项就必须出现在选择列表中。错误的写法:selectdistincttop100 userphone frommessageorderbyproxyiddesc 正确的写法:selectdistincttop100 ...
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