etl example

barcomplement : Now it seems that at that time was caught in the work of a misunderstanding, that is, the interviewer did not say join the field is the primary key, it can not only ha, not only will lead to greater than 3, because there are duplicates, and B table records are not enough places are null, so may be less than. Do not believe Sir you see:Example 1:The number of records in Table A is all in table B and the B-table ID is unique Example 2

ETL scheduling Read and write data information, all need to connect to the database, the following sub-program through the incoming database connection string and Database command (or SQL) to perform the required actions:#!/usr/bin/bash#created by Lubinsu#2014source ~/.bash_profilevalues= ' sqlplus-s Parameters are: Database connection string, Database command (or SQL statement)

dynamicpartitionsallowedtobecreatedineachmapper/reducer nodehive.exec.max.dynamic.partitions=1000 maximumnumberofdynamicpartitionsallowedtobecreated intotalhive.exec.max.created.files=100000 MaximumnumberofHDFSfiles createdbyallmappers/reducersinamapreducejob hive.error.on.empty.partition=false*/selectinput__file__name,ordernumber,event_time, block__offset__inside__file/ (Length (ordernumber) +length (event_time) +2) +1fromorder_created_dynamic_partition;selectinput__file__name,ordernumber, eve

Cost:Software costs include software products, pre-sales training, after-sales consulting, and technical support.Open-source products are free of charge and the cost is mainly training and consulting, so the cost will remain at a low

When data is extracted from the production environment to the warehouse, Chinese characters in the target database are garbled. My environment is from MySQL to MySQL. There are no heterogeneous databases at the moment, and the architecture is

The company has been involved in the development of Bi projects for a period of time, but it is only developed as needed. This afternoon, the company will train you on the knowledge of data warehouses, let's hear about the two to three hours, what

2006-12-20 The Excel file in the source file cannot be written into a combination of letters when the data is listed. The date format contains "Noon, when the source file is used as an Excel worksheet, modify these columns ('A' is added to the

Public Sub Main ()         '          ' Add your code here         '          Dim Sbwa As New StringBuilder         Dim i as Integer          Dim ArWA as New collections.arraylist         Dim beof as Boolean         for each R as DataRow in

QueryInfo info = new QueryInfo ();Info. Customsql = @ "SelectCOLUMN_NAME,Data_type,Data_precision,Data_scale,NVL ((Select T_s.commentsFrom All_col_comments t_swhere t_s.column_name = T.column_nameand t_s.table_name = ' ccr_company_fundamental '),

The traditional relational database generally uses the form of two-dimensional tables to represent data, one dimension is a row, the other is a column, and the intersection of rows and columns is the data element. Relational data is based on the

Sde:source Dependent ExtractSDE mappings-Extracts the data from the transactional Source System and loads into the Data Warehouse staging tables.SDE mappings is designed with respect to the source ' s unique data model.Sde_* workflows has only the

Gathen: 397706991, learning together Conf/hive.xml Specific shell code Download: http://download.csdn.net/detail/luo849278597/9490920 create table if not exists think_statistics (date_type_name string,date_name string,type int,type_ Name

Zipper Algorithm Summary Daquan:One, 0610 algorithm (append)1, the loading date of the deleted warehouse table is the data of this load date to support the re-runDelete from xxx where Start_dt >= $tx _date;2. Create a temporary table for storing

This article describes how to synchronize data to Oracle from PostgreSQL via ODI.1. Define the physical architecture1.1 Creating a new PostgreSQL data serverTopology->physical Architecture->postgresql, right-click to select New Data Server and enter

-- case2 ----========== click_log ==========--/*11    ad_101     2014-05-01 06:01:12.334+0122    ad_102     2014-05-01 07:28:12.342+0133    ad_103    2014-05-01  07:50:12.33+0111    ad_104    2014-05-01 09:27:12.33+0122     ad_103    2014-05-01 09:03

Zipper Algorithm Summary Daquan:One, 0610 algorithm (append)1, delete the loading date of the warehouse table is the data of the loading date to support the re-runningDelete from xxx where Start_dt >= $tx _date;2. Create a temporary table for

Cost:software costs include many aspects, including software products, pre-sales training, after-sales consulting, technical support and so on.The open source product itself is free, the cost is mainly training and consulting, so the cost will

This article describes how to synchronize data from MySQL to Oracle via ODI.1. Define the physical architecture1.1 Creating a new MySQL data serverTopology->physical Architecture->mysql, right-click to select New Data Server and enter the relevant

Python decorator use example and actual application example, python example Test 1 Deco is running, but myfunc is not running Copy codeThe Code is as follows:Def deco (func ):Print 'before func'Return func Def myfunc ():Print 'myfunc () called'Myfunc = deco (myfunc) Test 2 Call myfunc in the required deco to executeCopy codeThe Code is as follows:Def deco (func

/*====================================================================== A Globalmem Driver As an example of char device drivers There are two same globalmems in this driver This example was to introduce the function of File->private_data The initial developer of the original code is Baohua Song ======================================================================*/ #include #include #include #include #in