Oracle 11g r2 migrates from CentOS to Windows 10 using Data dump

****** Expdp Export, Impdp Import **** 1 Source system: Operating System: CentOS Oracle database version: Oracle 11g Enterprise Edition Release 11.2.0.1.0 SID: orcl Port: 1521 1 2 3 4 5 Target system: Operating System: Windows 10 Oracle database version: Oracle 11g Enterprise Edition Release 11.2.0.1.0 SID: orcl Port: 1521 1 2 3 4 5 ...

Posted on Tue, 25 Dec 2018 20:42:06 -0500 by blackhawk08

Instructions and Significance of OVER(PARTITION BY... ORDER BY...)

The function looks like this: OVER(PARTITION BY... ORDER BY...) As the name implies, PARTITION means segmentation in Chinese and ORDER means sorting, so the translation is to first divide a set of data into groups according to the field formulated, and then sort the data according to a field within the group. The use of this fu ...

Posted on Tue, 25 Dec 2018 20:03:06 -0500 by Shai-Hulud

Baptizing the soul, practicing python (91) -- Knowledge Gathering - python operation of py mysql module

First you have to learn the basic mysql operation statements: mysql learning Secondly, if Python wants to operate mysql, it is impossible to rely on python's built-in module. If calling cmd command through os module is feasible in principle, but it is not convenient, then this problem has been thought about for a long time, and it has been mad ...

Posted on Mon, 24 Dec 2018 21:00:06 -0500 by feyd

ArcEngine Query Statistics IQuery Filter, ISpatial Filter, IQuery Def, WHEREclauses

Students who have done query statistics with ArcEngine's interface should know that because ArcEngine does not fully support SQL, it's good to do simple queries, and a little more complex, they begin to be stretched. Now summarize several query methods: 1.IQueryFilter, ISpatialFilter interface. This is the most commo ...

Posted on Mon, 24 Dec 2018 16:06:06 -0500 by donbonzo

Default Sorting Behavior and Query of NULL Value in PostgreSQL Database, Index Definition Specification - nulls first last, asc desc

Label PostgreSQL, NULLS FIRST, NULLS LAST, ASC, DESC, default behavior, sort background In the database, NULL value refers to the value of UNKNOWN, which does not store any value. When sorting, it is specified by grammar before or after the line with value. for example -- Express null In front of the line of value select * from tbl order b ...

Posted on Mon, 24 Dec 2018 15:51:06 -0500 by Swardh

Mybatis's <where><foreach><set> etc. tag details and mybits configuration file resultMap tag configuration

1. Details of Mybatis's <where><foreach><set> and other labels In the where condition of sql statement, some security judgments are needed, such as searching by sex. If the incoming parameters are empty, then the query results are likely to be empty. Perhaps we need the parameters to be empty, which is to fi ...

Posted on Mon, 24 Dec 2018 14:48:07 -0500 by xploita

HTAP database PostgreSQL scenario and performance test 38 - (OLTP+OLAP) does not contain index multi-form point writing

Label PostgreSQL, HTAP, OLTP, OLAP, Scenario and Performance Testing background PostgreSQL is a database with a long history, which can be traced back to 1973. It was first awarded by the 2014 Computer Turing Prize winner and the originator of relational database. Michael_Stonebraker PostgreSQL has similar functions, performance, architectur ...

Posted on Mon, 24 Dec 2018 13:45:06 -0500 by tjmbc

Introduction to the most complete iOS data storage methods: FMDB, SQLite3, Core Data, Plist, Preference preference settings, NSKeyed Archiver archiving

For reproducing, please indicate the address of this article: http://www.jianshu.com/p/e88880be794f objective The project is going to use Core Data for local data storage. It was originally intended to write only about Core Data, but now that it comes to data storage, it's just a summary of the data storage base. This article will describe the ...

Posted on Mon, 24 Dec 2018 13:39:06 -0500 by phpdood

demo of a simple express+jade+mysql+bootstrap+nodejs

Nodejs With the rapid development of Nodejs, the hottest framework for Nodejs construction is not express. Github It can be proved by 32 K star. Let's build a simple demo with Nodejs as the center, which includes both front and back ends. Whatever project you develop, it's easy to understand and develop with scaffolding. Simple demo allows you ...

Posted on Mon, 24 Dec 2018 05:18:06 -0500 by LarryK

PostgreSQL 10.0 preview feature enhancement - increase access method CHECK interface amcheck

Label PostgreSQL, 10.0, amcheck, logical consistency checking, physical storage checking background Some high-end storage, including ZFS filesystems, have block detection and abnormal block repair functions after using RAID. For databases, the reliability of data is a very important indicator, for example: 1. Write what you enter and read wh ...

Posted on Sun, 23 Dec 2018 23:03:05 -0500 by acroporas