here主题的文章列表，还有here的技术要点_第4页

ORA-30957: cannot downgrade because there are XML indexes

文档解释ORA-30957:cannotdowngradebecausethereareXMLindexesCause:AnattemptwasmadetodowngradeadatabasethathasXMLindexes.Action:DropallXMLindexesbeforeattemptingthedow...

IT技术学习 ·2023-07-08

ORA-00976: Specified pseudocolumn or operator not allowed here.

文档解释ORA-00976:Specifiedpseudocolumnoroperatornotallowedhere.Cause:LEVEL,PRIOR,ROWNUM,CONNECT_BY_ROOT,CONNECT_BY_ISLEAForCONNECT_BY_ISCYCLEwasspecifiedatanillega...

IT技术学习 ·2023-07-08

ORA-13705: There was a instance shutdown/startup between the snapshots in the range [string, string].

文档解释ORA-13705:Therewasainstanceshutdown/startupbetweenthesnapshotsintherange[string,string].Cause:Instancewasshutdownandrestartedbetweenthetwospecifiedsnapshots...

IT技术学习 ·2023-07-08

ORA-04044: procedure, function, package, or type is not allowed here

文档解释ORA-04044:procedure,function,package,ortypeisnotallowedhereCause:Aprocedure,function,orpackagewasspecifiedinaninappropriateplaceinastatement.Action:Makesure...

IT技术学习 ·2023-07-08

ORA-27607: Smart I/O failed because there were no online disks. tablespace number: “string”, file number: “string”

文档解释ORA-27607:SmartI/Ofailedbecausetherewerenoonlinedisks.tablespacenumber:“string”,filenumber:“string”Cause:Therewerenoonlinedisksfound...

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-02201: sequence not allowed here

文档解释ORA-02201:sequencenotallowedhereCause:Anattemptwasmadetoreferenceasequenceinafrom-list.Action:Asequencecanonlybereferencedinaselect-list.ORA-02201：sequencen...

IT技术学习 ·2023-07-08

ORA-54035: keyword HIDDEN cannot be specified here

文档解释ORA-54035:keywordHIDDENcannotbespecifiedhereCause:AttemptedtospecifyHIDDENkeywordforavirtualcolumnAction:Thisisnotsupported.官方解释ORA-54035:keyword“stri...

IT技术学习 ·2023-07-08

ORA-54006: keyword VISIBLE cannot be specified here

文档解释ORA-54006:keywordVISIBLEcannotbespecifiedhereCause:ThekeywordVISIBLEwaseitherrepeatedorincorrectlyspecified.Action:Removethekeywordfromthespecifiedsyntax.。O...

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-010258; Symbol: ER_CONN_UNIX_IS_THERE_ANOTHER_USING_SOCKET; SQLSTATE: HY000

文档解释Errornumber:MY-010258;Symbol:ER_CONN_UNIX_IS_THERE_ANOTHER_USING_SOCKET;SQLSTATE:HY000Message:Doyoualreadyhaveanothermysqldserverrunningonsocket:%s?错误说明：MyS...

IT技术学习 ·2023-07-03

MySQL Error number: MY-010257; Symbol: ER_CONN_TCP_IS_THERE_ANOTHER_USING_PORT; SQLSTATE: HY000

文档解释Errornumber:MY-010257;Symbol:ER_CONN_TCP_IS_THERE_ANOTHER_USING_PORT;SQLSTATE:HY000Message:Doyoualreadyhaveanothermysqldserverrunningonport:%d?错误说明MY-010257...

IT技术学习 ·2023-06-30

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