IQ主题的文章列表，还有IQ的技术要点_第4页

ORA-02273: this unique/primary key is referenced by some foreign keys

文档解释ORA-02273:thisunique/primarykeyisreferencedbysomeforeignkeysCause:Self-evident.Action:Removeallreferencestothekeybeforethekeyistobedropped.ORA-02273错误由Oracl...

IT技术学习 ·2023-07-08

ORA-16184: DB_UNIQUE_NAME string hashes to the same value as DB_UNIQUE_NAME string

文档解释ORA-16184:DB_UNIQUE_NAMEstringhashestothesamevalueasDB_UNIQUE_NAMEstringCause:TheinternalhashvaluegeneratedforoneDB_UNIQUE_NAMEcollidedwiththehashvalueofano...

IT技术学习 ·2023-07-08

ORA-02270: no matching unique or primary key for this column-list

文档解释ORA-02270:nomatchinguniqueorprimarykeyforthiscolumn-listCause:AREFERENCESclauseinaCREATE/ALTERTABLEstatementgivesacolumn-listforwhichthereisnomatchingunique...

IT技术学习 ·2023-07-08

ORA-02429: cannot drop index used for enforcement of unique/primary key

文档解释ORA-02429:cannotdropindexusedforenforcementofunique/primarykeyCause:userattemptedtodropanindexthatisbeingusedastheenforcementmechanismforuniqueorprimarykey....

IT技术学习 ·2023-07-08

ORA-55622: DML, ALTER and CREATE UNIQUE INDEX operations are not allowed on table “string”.”string”

文档解释ORA-55622:DML,ALTERandCREATEUNIQUEINDEXoperationsarenotallowedontable“string”.”string”Cause:Anattemptwasmadetowritetooralterorcreate...

IT技术学习 ·2023-07-08

ORA-01761: DML operation does not map to a unique table in the join

文档解释ORA-01761:DMLoperationdoesnotmaptoauniquetableinthejoinCause:Theprimarytableisthebasetableagainstwhichtheupdate,insertordeleteoperationisfinallybeingdone.Fo...

IT技术学习 ·2023-07-08

ORA-39793: Attribute “string” is not unique within the hierarchy being loaded.

文档解释ORA-39793:Attribute“string”isnotuniquewithinthehierarchybeingloaded.Cause:Theattributewasdefinedinmultiplelinesofdescentinthehierarchybeingloade...

IT技术学习 ·2023-07-06

ORA-01715: UNIQUE may not be used with a cluster index

文档解释ORA-01715:UNIQUEmaynotbeusedwithaclusterindexCause:AnattemptwasmadetocreateaclusterindexwiththeUNIQUEattribute.Action:RemoveUNIQUEfromtheCREATEINDEXstatemen...

IT技术学习 ·2023-07-05

MySQL Error number: MY-010482; Symbol: ER_NDB_OOM_IN_FIX_UNIQUE_INDEX_ATTR_ORDER; SQLSTATE: HY000

文档解释Errornumber:MY-010482;Symbol:ER_NDB_OOM_IN_FIX_UNIQUE_INDEX_ATTR_ORDER;SQLSTATE:HY000Message:fix_unique_index_attr_order:my_malloc(%u)failure错误说明MY-010482ER...

IT技术学习 ·2023-06-27

MySQL Error number: MY-010905; Symbol: ER_FAILED_TO_GENERATE_UNIQUE_LOGFILE; SQLSTATE: HY000

文档解释Errornumber:MY-010905;Symbol:ER_FAILED_TO_GENERATE_UNIQUE_LOGFILE;SQLSTATE:HY000Message:Can’tgenerateauniquelog-filename%s.(1-999).错误说明：MY-010905ER_FA...

IT技术学习 ·2023-06-25

MySQL Error number: 3728; Symbol: ER_SPATIAL_UNIQUE_INDEX; SQLSTATE: HY000

文档解释Errornumber:3728;Symbol:ER_SPATIAL_UNIQUE_INDEX;SQLSTATE:HY000Message:Spatialindexescan’tbeprimaryoruniqueindexes.错误说明：ER_SPATIAL_UNIQUE_INDEX是MySQL错误...

IT技术学习 ·2023-06-17

linux命令：uniq

uniq功能说明：检查及删除文本文件中重复出现的行列。语　　法：uniq [-cdu][-f<栏位>][-s<字符位置>][-w<字符位置>][--help][--version][输入文件][输出文件]补充说明：uniq可检查文本文件中重复出现的行列。参　　数： ...

开发笔记 ·2023-03-16

爆表！猜猜这个大会的IQ总值有多高？

“人人可及的未来，同样存在于「日拱一卒」的琐碎生活当中，那也是技术对生活最为直观的改变和演进。”“以通神明之德，以类万物之情”，这句来自《易经》的话，放到现今也合宜。人类掌控事物发展的基本规律和内在联系，然后通过技术把智慧赋予万事万物中，就像AI，亦不再发生在科幻小说中，而成为了这个时代的生活日常。什么样的算法能够满足...

代码星球 ·2021-02-24

去除重复命令uniq

命令uniq经常用于去除一个文本中的重复行。用sort命令也可以去除重复行，但二者有较大区别：用sort去除重复行时，sort将整个文本中的多个重复行去除，仅保留一行，而uniq会将多个连续重复的行去除，仅保留一行。命令格式：uniq[option][input[output]]常用选项：c：输出重复行的重复次数。d：...

代码星球 ·2021-02-21

IQueryable<T>和表达式树

https://www.cnblogs.com/zhaopei/p/IQueryable-IQueryProvider.html...

代码星球 ·2021-02-19