db2 sql interview questions

Common Database interview questions and database questions Paradigm 1: Each column in a database table is a basic data item that cannot be further divided. values or duplicate attributes are not allowed. For example, if a table contains a phone number field, the value has a mobile phone number, there is another seat number, which does not match.Summary: fields c

according to your design to complete the following scenarios. 1. Find five articles closest to the specified article (similarity algorithms are based on the number of identical labels, and the larger the number, the more similar) Integrated Knowledge Section: 1. Talk about your understanding of cookies and sessions, what their application scenarios are, and how they might be able to explain how the session can be shared under a variety of applications. 2. Talk about your understanding of single

This article focuses on the question of Ajax questions and answers, you can take a look at the interview of those who are how to issue, and see what the correct answer is. Now, let's see this article. 1. Do you interact with the background during work? Well, can you tell me a few parameters in the encapsulated Ajax? URL: The address where the request was sent. Type: The request method (post or get) defaults

PHP Interview Questions and Answers, php Questions and answers 1. Write a function to implement the following functions:Convert the string "open_door" to "OpenDoor" and "make_by_id" to "MakeById ".Function str_change ($ str ){$ Str = str_replace ("_", "", $ str );$ Str = ucwords ($ str );$ Str = str_replace ("", "", $ str );Return $ str ;} 2. Write a program to c

Common Database interview questions and database questions1. Foreign key candidates for primary key superkeys Primary key: A combination of data columns or attributes that are unique and fully identified for the stored data objects in the database table.A data column can have only one primary key.And the value of the primary key cannot be missing, that is, it cannot be Null ). Superkeys: The attribute set t

least one master thread is running all the time. They can use the resources of the process. For example, multiple threads can operate the Model...In multi-process design, a process crash does not affect other processes.In multi-threaded design, a thread crash will affect other threads.If the process crash, all its threads will crash. Extended Interview Questions: how to design a thread in iOS?Extended

so file not foundNoclassdeffounderror: You can find the right class at compile time, but you can't find the right class at runtime.Iv. outofmemoryerror (Memory overflow)Cause:1, the amount of data loaded in memory is too large, such as the last time to remove too much data from the database.2, the collection class has a reference to the object, after use is not emptied, so that the JVM can not be recycled.3. There are dead loops or loops in the code that produce too many duplicate object entiti

, SQL, XML, UNIX, generic programming, object-oriented programming, data structures and algorithms, network, coding, and other aspects of work. Due to the variability of the programmer's job-seeking power, you need special skills to present yourself as the interviewer expects. It is important to remember that when answering an electrical problem, key points should be raised as early as possible, and key answers should always be given. Because the in

Spring, hibernate, Struts interview questions from: http://shwenwen.itpub.net/post/34911/486887 How does hibernate work and why?Principle:1. Read and parse the configuration file2. Read and parse the ing information and create sessionfactory3. Open sesssion4. Create transaction Transation5. Persistent operations6. Submit the transaction7. Disable session8. Disable sesstionfactory Why:1. For JDBC access

(avoid loss of modification) 2) Level two block protocol: increase transaction T on the basis of the first level blocking protocol must read the data R before reading the lock, you can release the read lock after reading (to avoid loss of modification and read dirty data) 3) Level three block protocol: increase the transaction T on the basis of the first level blocking protocol the lock must be read before the data R is read, until the end of the transaction is released (avoid loss of modificat

PHP classic interview questions (Basic I) with answers. Interview and written examination are often indispensable for job hunting and recruitment. as a php programmer, more or less will have similar experiences. The following are the PHP interview questions I have collected

XML interview questions include XSLT techniques for transforming XML files, xpath,xquery, and XML basics such as DTDs or schemas. This article will see 10 common XML interview questions and answers. Most of these questions are asked in a Java

Tags: meaning data SQL database ODB details issues HDF cut feature threads1. What are the differences between row and column storage?What are the modes of 2.MySQL database Binlog? What's the difference?3.awk How to print out the number of columns in a file?4.awk How do I specify delimiters, and how do I specify delimiters for cut?5. What happens if one of the disks in HDFs (the amount of data is particularly large) is unplugged.6. How do I view thread

Let's talk about some questions about the java programmer interview. This blog post is intended for recent graduates and java programmers who have been working for about two or three years. Why do I need to change jobs? This is a broad question. Everyone has an answer. For example: The company is not well-treated, The salary increase does not meet the expected requirements, Tired of the hard work of travel

You must prepare the Python programmer interview questions in advance! (Answer and resolution), python programmer You must prepare for these questions before releasing "Python programmer interview". After the article, in response to the strong requirements of the majority of programmers and friends, xiaobian compiled a

(i) Description1. document Some of the programming questions (Python) that you encounter when interviewing a test engineer. 2, review the interview process, do a summary.(ii) title1. Input: JSON {"A": "AA", "B": "BB", "C": {"D": "DD", "E": "EE"}} output: Dictionary {' A ': ' AA ', ' B ': ' BB ', ' d ': ' DD ', ' e ': ' EE '}1 defconversion (n,the_dict):2 forKey,valueinchN.items ():3 #if value i

? Window.location.href 9.MySQL database, how to optimize? Answer: (1) configuration optimization (server configuration) (2) Build table optimization (table, field settings) (3) query optimization (SQL statement) A: 1, select the most applicable field properties, to minimize the definition of field length, as far as possible to set the field not NULL, such as ' Province, gender ', preferably set to enum 2. Use connection (join) instead of subquery: 3.

Sort out some MySQL interview questions 1. How to log on to the mysql databaseMysql-u username-p 2. How to enable/disable the mysql ServiceService mysql start/stop 3. view the mysql statusService mysql status 4. How to display the number of all databasesShow databases 5. How to obtain the names and types of all field objects in the tableDescribe table_name; 6. Does MYSQL support transactions?In the default

probability, which is proportional to the weight and access ratio, for situations where the performance of the backend server is uneven. For example:Ip_hash (IP): Each request is allocated according to the hash result of the IP access, so that each visitor fixed access to a backend server, can solve the session problem. For example:Fair (third-party): Allocates requests with short response times based on the response time of the backend server.VII: Middleware-Message Queuing (ACTIVEMQ)-which re

Oracle interview questions-Technical This may be an article you have been looking forward to. while paying attention to this part of technical questions, please be sure to read personal questions and answers during the interview. The answer here is not comprehensive. These