WHERE主题的文章列表，还有WHERE的技术要点_第1页

thinkphp where中or多个like模糊搜索

$where['m_username|mnickname']=array('like',"%{$keyword}%",'or');['name|seo_title|keywords|description|desc|introduce_text...

开发笔记 ·2024-03-19

ORA-25955: all tables must be joined in the where clause

文档解释ORA-25955:alltablesmustbejoinedinthewhereclauseCause:Anattempttocreateajoinindexwasmade,whichfailedbecauseoneofthetablesinthefromclausedidnotappearinthewher...

IT技术学习 ·2023-07-26

ORA-24348: Update or Delete without Where

文档解释ORA-24348:UpdateorDeletewithoutWhereCause:AnupdateordeletewasexecutedwithoutwhereclauseAction:AnOCI_SUCCESS_WITH_INFOisreturned.ORA-24348：没有WHERE子句的update/d...

IT技术学习 ·2023-07-23

ORA-27054: NFS file system where the file is created or resides is not mounted with correct options

文档解释ORA-27054:NFSfilesystemwherethefileiscreatedorresidesisnotmountedwithcorrectoptionsCause:ThefilewasonanNFSpartitionandeitherreadingthemounttabfilefailedorth...

IT技术学习 ·2023-07-11

ORA-25950: missing where clause in join index specification

文档解释ORA-25950:missingwhereclauseinjoinindexspecificationCause:Anattempttocreateajoinindexwasmade,whichfailedbecausenovalidwhereclausewasfound.Action:Ensurethata...

IT技术学习 ·2023-07-11

ORA-25958: join index where clause predicate may only contain column references

文档解释ORA-25958:joinindexwhereclausepredicatemayonlycontaincolumnreferencesCause:Anattempttocreateajoinindexwasmade,whichfailedbecauseapredicateinthewhereclauseco...

IT技术学习 ·2023-07-11

ORA-25951: join index where clause cannot contain OR condition

文档解释ORA-25951:joinindexwhereclausecannotcontainORconditionCause:Anattempttocreateajoinindexwasmade,whichfailedbecausetherewasanORbranchinthewhereclause.Action:R...

IT技术学习 ·2023-07-11

ORA-01859: a non-alphabetic character was found where an alphabetic was expected

文档解释ORA-01859:anon-alphabeticcharacterwasfoundwhereanalphabeticwasexpectedCause:Theinputdatatobeconvertedusingadateformatmodelwasincorrect.Theinputdatadidnotcon...

IT技术学习 ·2023-07-08

ORA-25957: join index where clause cannot contain cycles

文档解释ORA-25957:joinindexwhereclausecannotcontaincyclesCause:Anattempttocreateajoinindexwasmade,whichfailedbecausethewhereclausecontainsacycle.Action:Ensurethatth...

IT技术学习 ·2023-07-08

ORA-01532: cannot create database; instance being started elsewhere

文档解释ORA-01532:cannotcreatedatabase;instancebeingstartedelsewhereCause:DuringCREATEDATABASE,anotheruserappearstobesimultaneouslyalteringtheinstance.Action:Makesu...

IT技术学习 ·2023-07-08

ORA-01858: a non-numeric character was found where a numeric was expected

文档解释ORA-01858:anon-numericcharacterwasfoundwhereanumericwasexpectedCause:Theinputdatatobeconvertedusingadateformatmodelwasincorrect.Theinputdatadidnotcontainanu...

IT技术学习 ·2023-07-05

MySQL Error number: MY-011683; Symbol: ER_GRP_RPL_SINGLE_PRIM_MODE_NOT_ALLOWED_WITH_UPDATE_EVERYWHERE; SQLSTATE: HY000

文档解释Errornumber:MY-011683;Symbol:ER_GRP_RPL_SINGLE_PRIM_MODE_NOT_ALLOWED_WITH_UPDATE_EVERYWHERE;SQLSTATE:HY000Message:Itisnotallowedtorunsingleprimarymodewith&#...

IT技术学习 ·2023-06-19

C# 利用泛型 where 解决 List 项无法转换的问题

假设有类：public class Car : ICar{}还有一个类有方法：public class CarHelper{ public static void Remove(Lis...

代码星球 ·2023-04-16

小心 List.Where 中 Lambda 表达式，性能问题

List<int> list = new List<int>();list.Add(1);list.Add(2);list.Add(3);// 写法一var obj = list.Where(m =>...

代码星球 ·2023-04-16

使用 Dictionary 代替 List.Where，提高速度

在C#中，有一List，有上万条数据项，每个数据项，又是一个类，List.Where去查找符合条件的类，然后计算，由于不断地调用List.Where，整个时间耗时约2分钟。不能忍受该时间。由于每调一次List.Where，就去循环一次，所以考虑使用Dictionary来代替，Where中判断条件，写作key，需要输出的...

代码星球 ·2023-04-16