udacity data engineer

Package Description:Oracle DBA Database Senior Engineer (lower) SQL language + performance optimization + data replicationHttp://edu.51cto.com/pack/view/id-973.html oracle DBA Database Senior Engineer Training course is the wind brother alone research and development of the fine combat courses, the road map is mainly to let everyone fast employment , high

Algorithmic/Data engineer essential Skills Basic knowledge Linear algebra Matrix theory Probability theory Stochastic process Graph theory Numerical analysis Optimization theory Machine learning Statistical learning methods Data mining Platform Linux Language

Security code: Life should be like a candle, from the top burning to the end, has always been bright1, why do you want to do backup? In daily life, such as: program errors, human errors, computer failures, disk failures, unknown natural disasters (fire, earthquakes), or theft ,can result in data loss.2. What is Backup? A backup is a copy of the data that is used to restore and recover

development Baidu Encyclopedia ②[Large Data engineer Skill map] 4. Tell me what the role of the Hadoop framework is. me : Then let me say hadoop2.0+: The Namenode,datanode,journalnode,yarn frame: Resourcemanager,nodemanager, Dfszkfailovercontroller. 5. Assuming that a scenario, we have a customer, we have negotiated the data model is based on four fields, but l

new empty database testusing the command: mysql -u root #因为在上一步已经退出了MySQL，现在需要重新登录 CREATE DATABASE test; #新建一个名为test的数据库 Again Ctrl + Z exit MySQL, then enter the statement to restore, the bak.sql just backed up to the test database: test We enter a command to view the table of the Tset database to verify the success of the recovery: mysql -u root #因为在上一步已经退出了MySQL，现在需要重新登录 use test #连接数据库test SHOW TABLES; #查看test数据库的表 You can see 4 tables and a

represent a string. In the development of programs, many operations are done using strings, such as user names, passwords, e-mail addresses, etc. in the system.PS: Other small partners on reference types will be detailed in the later course.TaskTry your luck!Which type of variable is used to save the following data? Name: Adoration class Gender: Male Winning Numbers: 18 Price: 120.5 Are you sure

statement queries the number of employees in the department, where the ID and name of the employee are from the employee table, people_num from the Department table:The other Connection statement format is using the join on syntax, which is equivalent to the following statement:SELECT id,name,people_numFROM employee JOIN departmentON employee.in_dpt = department.dpt_nameORDER BY id;The result is the same as the statement just now.Second, practice1, using the method of connection query, the numb

the table (1) Modify a value in the tableMost of the time we need to make changes not the entire database or the entire table, but one or more of the data in the table, which requires us to use this command to achieve precise modification:UPDATE 表名字 SET 列1=值1,列2=值2 WHERE 条件;For example, we want to change Tom's age to 21,salary to 3000: Note: Be sure to have a where condition, or there will be consequences you don't want to see (2) Delet

Department table), the insert succeeds: 7, non-null constraintsA non-null constraint (NOT NULL), which can be understood by a name, is a non-null constrained column that must not be empty when inserting a value. Violations of non-null constraints in MySQL, will not error, there will only be warnings, such as the following statement: INSERT INTO employee(id,name,salary,phone,in_dpt) VALUES(03,‘Jim‘,3400,119119,‘dpt2‘); #INSERT成功 age为空，因为没有非空约束，表中显示NULL INSERT INTO employee(id,name,age,phone,in_

Time: 2015-09-09 15:40 ~ 16:40Location: No. 1th, Wang Zhuang Road, Haidian District , Beijing Tongfang Science and Technology Plaza, Block D, West 7 This is the HR side. Talk about the pros and cons of startups and big companies. Working hours and annual leave issues. Work 6 days a week, OMG.7 days a year holiday, OMG.However, a little information in Silicon Valley has office, giant want to go.Summary: A good start-up company, worth owning!2015-09-09 [Little information]--

Time: 2015-09-09 13:40 ~ 14:40Location: No. 1th, Wang Zhuang Road, Haidian District , Beijing Tongfang Science and Technology Plaza, Block D, West 7 1. How many bits a and B are different#include #include#include#include#include#include#includestring>using namespacestd;//Return the number of difference bits of a and B//Return 1 If a = 0 and B = 1//Return 2 If a = 0 and B = 3intDiffintAintb) { intAns =0; A= a ^b; inti = +; intj =1; while(i--) { if(A j) Ans++; J1; } returnans;}int