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Database Review ⑩June 19, 201613:40Main Transactions TransactionThe concept of 1.Transaction Concept transactionsA transaction is a unit of program execution that accesses and possibly updates various data items.A transaction is a unit of concurrency control and is a user-defined sequence of operations. These operations are either done or not, and are an inseparable unit of work. With transactions, SQL Server can bind a logically related set of operat

Label:Database Review ⑨ June 19, 2016 12:45 Main Database Programming 1. Introduction of Transact-SQL Transact-SQL is the language used by the application to interact with SQL Serverdbms. Transact-SQL = high-level programming language can apply Transact-SQL to database programming to realize data processing function Variables in the 2.transact-sql Local variables: A local variable is a user-defined variable whose scope is limited to the inside of the

Tags: varchar uniq review weight Zhang Mowgli add PNG code CREATE databaseAfter the cmd command to enter the database, you need to manually do some operations on the database Create a database plus a semicolon MySQL>Createdatabase myfirstdatabase; View the database you created plus s and semicolons MySQL>show Databases; Select the database plus semicolon to use MySQL> use myfirstdatabase; Create a database table plus a semicolon, and add character fo

Originally learned time, quite smooth, did not expect to use again, or encountered a lot of problems, resulting in the failure of the update, so, can only reconstruct the migration, so as not to look at the chaos.First, delete the migration, restore the data to the (a) End state1. Delete Folder2. Delete a table3. Delete Columns4. Comment out the newly added attributesSecond, re-operation EF6 in the original database using Codefirst Total review (secon

Tags: name login list Practice COM label Message Info user A bit with the original database in the use of codefirst far, but always review it, must be comprehensive point. One, insert two users in the user table (users) Second, generate the Post interface MVC generates a lot of interfaces and doesn't use Ajax, which is rarely used in real-world development, just for demonstration purposes. But no matter what the build, attributes, entity objects, etc

This is my second blog in 51, mainly to review my it career, first after graduation I engaged in ERP development, involving large enterprises of human resources management, logistics management, production management, finance and other fields, the front desk will make form, report. The background will write stored procedures and so on. In the software development process I participated in the whole process of software including: Demand research, summa

Disclaimer: This article is for the author to review the database course with a simple record of notes, if there are errors, please point out, thank you.First, the theoretical basis1. non-destructive connectivity (Lossless join): Set relationship mode R (u,f) is decomposed into several relational patterns R1 (U1,F1), R2 (U2,F2), ..., Rn (UN,FN), where u=u1u2 ... Un, and there is no Unuj, FI is the projection of F on the UJ, if R is equal to the result

Review database Connection pool: C3P0, DBCP1, the advantages of database connection pooling technology:• Resource reuse:Due to the reuse of database connections, there is a high performance overhead associated with frequent creation and release of connections. On the basis of reducing the system consumption, on the other hand, it also increases the stability of the system operating environment.• Faster system response Speed:Database connection pooling

"Cleanmymac" and run to clean up binary code, system cache, logs, language, garbage, garbage, etc. CLEANMYMAC also has device management, fast and permanent erase and extension manager, while allowing for custom appearance modifications. Currently, the clean My mac contains more than 50 features in maintenance, monitoring, cleaning, utilities and feedback categories.Cleanmymac and MacKeeperAny good "Cleanmymac" commentary will compare it to its biggest competitor, MacKeeper, and that's why I'm

=============================================================================VI/VIM Command Review and Practice:---------------------------------------The Command mode yy copies the contents of the line where the cursor is located 4yy the copy cursor is located on the line starting with the 4 line of content p paste dd Delete/cut the contents of the line where the cursor is located 2DD Delete/The cut cursor is located on the line where the 2-row cont

Tags: database view sqlDatabase review concept of CH6 view 6.1 viewA view is a virtual table that is exported from one or more tables (or views), and the DBMS only holds the definition of the view in the data dictionary , and the view's data is still actually stored in the base table where it was exported The basic statements for defining views in Tutorial D are as follows: view_name> VIEW (relational_condition>) {property_list>}; So what does a view

Tags: database transaction SQL SQL transactionDatabase review CH13 Transaction 13.1 ConceptsA transaction is a series of database operations performed as a single logical unit of work that may modify multiple tuples in multiple tables The structure of the normal execution of a transaction is: begin; 1 2 ... SQL execution N commit; The BEGIN flag starts a transaction, and multiple SQL statements are transactional logical units of work, commit(commit) i

Database Review CH2 Database Architecture 2.1 Database Architecture hierarchyA database architecture can be divided into 3 tiers: External level Conceptual hierarchy Internal level The external hierarchy refers to the interface that each user accesses the database in different high-level languages, the representation of the conceptual hierarchy database information, and the definition of the module (including security and integri

Address: http://www.phabricator.com/docs/phabricator/article/Audit_User_Guide.html OverviewPhabricator supports two code review workflows: Review (pre-submission review) and Audit (post-Submission review ).This document outlines the post-Submission review process using the a

Code ReviewI have been doing software development for more than three years. My team has also used various Code quality control methods. I personally think Code Review is the most effective method, it is also the most cost-effective code quality control method. I will summarize some of my views and opinions. What is Code Review? Code Review Chinese translation me

Lesson 1 Spring Ice and Snow melted seeds sprout fruit trees blossom We came to the river, to the field, to the mountain. We found spring 1980s primary school textbook Review Lesson 2 peach blossom apple blossom Many fruit trees are planted in our village. It's spring, the trees are all flowers, and our village is a garden. In the fall, the tree filled with fruit, and our village became an orchard. 1980s primary school textbook

Reprint: http://blog.csdn.net/huachao1001/article/details/53156582In October, no longer participate in the school recruit, the interview process is really tired, sometimes on-site interview is a few hours. In addition to the pressure of graduation thesis, so did not continue to participate in the company's pen interview. Over the past few months, the review also used to search for information, search the real problem. After all, from small to large ex

This tweet is a former colleague to share the time of the PPT, here I sorted out to share to everyone What is code review?Code review is a quality assurance mechanism that verifies code implementation by systematically checking the source code during the software development process.Why not do code review? Business needs are big and working hours ar

First, learning Ladder division:First-order Basis comprehensive review (March ~ June)Second-order reinforcement familiarity (July ~ October)Third-order mode to examine the lack of traps (November ~ December 15th)Four-stage finishing touch-up status (December 16 ~ Pre-exam)Ii. Bibliography:Essential Resources:Math Exam Syllabus"Advanced Mathematics" Tongji version: To explain the more detailed, difficult questions moderate, involving a wide range of co

As mentioned in the previous article, I no longer work in Google. I have not figured out where to go-there are two or three very good job opportunities in front of me. Because during this decision period, I was no longer employed by anyone. I wanted to write something professional, something interesting, however, it also causes tension between colleagues and management work. Google is a very good company. They have made a lot of commendable things-both outside the company, what people can see,