what is fact and dimension table in data warehousing

What to do when the Excel table is filled with errors And the result is this ... You can only work at the desk, the incorrect correction, not clear to a variety of consecutive one to confirm, trouble not to say, without a lot of increase in workload, efficiency low to heinous, how to do? In

[Translated from mos] What is the difference between basic table compression and advanced compression in oracle databases?Differences between basic table compression and advanced compression,Extracted from the mos Article Difference Between Basic Table Compression And Advanc

What is the page allocation status when SQL Server creates a table? Thanks again to the sqlskill website and the person who reproduced and translated the article on the sqlskill website, because your reprinting and translation have helped the younger brother learn the tools used in the article "o (_) o: view the small plug-in InternalsViewer on the internal

What is a data structure ?, Data structure?1. Introduction It has been more than half a year since I learned the data structure in March this year, and it's quite comfortable. What should I do? I have been working for a while, I h

large amount of data (although many people have the big data defined above the T level, in fact, I think this is problematic, big data in fact should be a relative concept, is relative

[] longtext VARCHAR ENUM (' java.lang.String ', ' value1 ',...) CHAR java.lang.String SET (' value1 ', ' value2 ',...) CHAR java.lang.String For the Boolean type, in the MySQL database, the individual thinks that it is not convenient to use the int type, especially in projects with Web page development, representing 0/1, which corresponds to an integer of Java type. When the page is displayed, it can be ju

Article Source: http://blog.csdn.net/haiross/article/details/383796151 Oracle: Table name, field name, constraint name are limited in length2 3 naming rules for Oracle:41, to start with a letter52, contains letters and numbers, and # $63, cannot exceed 30 characters7 8 This is the limitation of Oracle! 9 Ten database table name length limit problem One Modify the

What is a data structure ?, Data structure? 1. Introduction It has been more than half a year since I learned the data structure in March this year, and it's quite comfortable. What should I do? I have been working for a while, I

characterized by a large amount of data (although many people have the big data defined above the T level, in fact, I think this is problematic, big data in fact should be a relative concept,

Item category idcategoryname item table idnamecategoryname, what should I do with this product? Directly copy the categorynam... product category of the product category Id categoryname Item tableId name categoryname (The problem is that the id of the product category or the categoryname of the product category is

Department of Technology 2018.4.161. Callable and Thread differencesThe line Cheng Nen that implements the callable interface returns the execution result, and runable is not. Callable's call method allows exceptions to be thrown.Since callable can return execution results, if a thing can be divided into more than do, and then merge the results, you can use callablePublic interface CallablePublic interface Runnable {public abstract void run ();2.

When the data table name is changed (a regular prefix is added), must the system modify the SQL statement? The SQL format of the original system is as follows: Select * from 'table '; After going online today, you will know: Fo

Open Jinshan WPS Form document, we will find, Jinshan WPS table toolbar has a "camera" function, then, Jinshan wps form of the camera function what use? Still do not know the netizen can take a look at today's small series to share the Jinshan WPS form Camera function use method Introduction! First, we set up a data area in the

Label:A set of powerful and comprehensive sqlite graphical user interface tools, Navicat forSQLite provides users with a full set of server management functions. It is equipped with SQL query, data editing and data Model tools, and supports all SQLite object types. But some users don't know much about their functionality. This tutorial will give you a detailed in

When submitting a form, the Name property of the form and the field names of the data table are the same, so what's wrong with that? Reply content: When submitting a form, the Name property of the form and the field names of the data table are the same, so what's wrong with that? The more information you get fr

experience. So from the mastery of the skills, the two are very different, the data Modeler in fact rarely mentions the word algorithm, more say what model to use, have feelings? However, from the practical perspective, these two models more and more do not have a clear division of labor, in general, will be two positions of people will learn each other's knowle

What is the value of the null and non-null settings when MySQL creates a table? Reply to discussion (solution) Did anyone answer???? I generally try not to use nullIf your 0 and null or ' and null have different meanings, then you need to allow empty It depends on your business needs.Null null means nothing is

Send JSON file Request File category.php Corresponding tables in the database JSON results Data results in front of many inexplicable don't know where the table data "expression" What do we do? Reply to discussion (solution) That's the wrong message!Your PHP version

Ex.change (ex.str,ex.ch);7System.out.print (ex.str+ "and");8 System.out.print (ex.ch);9 }Ten Public voidChange (String str,Charch[]) { Onestr= "Test OK"; ACh[0]= ' C '; - } -}The answer to the output is:? Hello and CB;It is explained that the string class is of the final type and cannot inherit and modify the class. str= "Tesk OK", in

://files.cnblogs.com/foundation/WFWCF.rar Project Description Data warehouse, in the wfwcf.rar File Generally, a [data logic layer] is built when an enterprise application is built. The general structure is as follows: This example uses a simple example to explain h