SQL statements get today, yesterday, nearly 7 days, this week, last week, this month, last month, half year data

Label: onTo say there is an article table article, the time to store an article's added article is the Add_time field, which is an int (5) type, you now need to query the total number of articles added today and sort by time from large to small,

Optimizing SQL queries: How to write high-performance SQL statements

Label:1, first to understand what is called the implementation plan?An execution plan is a query scheme that the database makes based on the statistics of SQL statements and related tables, which are generated automatically by the query optimizer,

Understanding the JVM (1)--Object Assignment & Recovery algorithm

Label:Originally the title Party wanted to write "in-depth JVM", but not too bold, I think a small blog I think it is not enough to explain the JVM, in this article, I would like to introduce you to the JVM a lot of internal knowledge, the concept

Internationalization module Angular-translate simple and convenient translation in English and other multi-language environment

Label:Many Web services face not only the local users, the multi-lingual environment can not only enhance the force lattice, more important is a user experience.Angular.js as a solution to the front-end split, of course, can not be separated from

Following a Select Statement Through Postgres Internals

Label:The third of a series of posts based on a presentation I do at the Barcelona Ruby Conference called "20,000 Leagu Es under ActiveRecord. " (Posts:one and video).Preparing for this presentation over the Summer, I decided to read through parts

Mycat Discovery (4)----The mycat of the self-growth primary key and returns the implementation of the generated primary key ID

Label:Description: Mycat self-growing primary key and returns the implementation of the generated primary key ID1) MySQL itself on the non-self-growing primary key, using last_insert_id () will not return the result, will only return 0; here's a

Rules for the construction of Roman numerals

Label:Roman NumeralsRoman numerals are the counting system of the Roman period, and the earliest digital representations, mostly for clocks, calendars and chapter numbering. It is generally believed that Roman numerals are used only for counting and

Analyze the deferred load action on the Simon script

Label:Dim Lasttime, StopTime, IStoptime= now+delaytime/24/3600//delaytime for the time delay can be set to the number of seconds, 1/24/3600 for a second unit, 0.1/24/3600 for 100 milliseconds units, a number of modulo remainder must be in this

Based on year, month, week, calculation specific one day (Monday)

Label:#region old based on year, month, week, calculate specific day<summary>Old based on year, month, week, calculate specific day</summary>public Object Showweekdate (int year, int month){list<object> lists = new

Bookstore project using XAMPP detailed configuration Part 1

Label:This is a project of the school, which is recorded here for review. The main use of XAMPP through the phpMyAdmin connection MySQL database, to achieve a simple query function.Outline Setup of XAMPP Implementation of MySQL database

Spark Shuffle out-of-heap memory overflow problem and resolution (Shuffle communication principle)

Label:Spark Shuffleout-of-heap memory overflow problem and resolution (Shufflecommunication principle)Problem descriptionSpark-1.6.0 was already in January release, in order to verify its performance, I used some large SQL to verify its performance,

Invoke and BeginInvoke

Label:First of all, there are two scenarios for invoke and BeginInvoke use:1. Invoke, BeginInvoke in control.2. Invoke, BeginInvoke in Delegrate.These two situations are different, and we're going to talk about the 1th kind here. Here we are

"Translation" A (very) short Introduction to R R Introduction

Label:ObjectiveThis article is translated from Paul Torfs & Claudia Brauer's article A (very) short introduction to R. One of the more simple places without translation, not good in Chinese description of the place is not translated.1.

"Calculus" 07-Application of calculus

Label:1. Differential Application 1.1 Differential 1.1.1 monotonicity, extremum and asymptote of unary functionThe derivative gives the direction of the function, which is very useful for the graphical properties of our analytic functions, and here

Use Grunt-contrib-connect and grunt-connect-proxy to build a development environment for front-end separation

Label:Separation of the front and rear end of the word is not fresh, full front-end separation in the post collaboration, the front end does not write any background, the background does not write any page, the two sides through the interface to

A good PDF development Library

Label:C + + libraries:1,pdf Class Library Podofohttp://podofo.sourceforge.net/Podofo is a C + + class library for manipulating PDF file formats. It also contains widgets for parsing, modifying, and creating PDF

Sudo:effective uid is isn't 0, is sudo installed setuid root

Tags: effective root permissions Execute file binary userThe sudo command is required when a normal user needs to use root privileges temporarily, but it is necessary to use ROOT to execute the/usr/bin/sudo binary when executing the sudo command.If

Least squares (RPM)

Label:Least squares (also known as the least squares method) is a mathematical optimization technique. It matches by minimizing the squared error and finding the best function of the data. By using the least squares method, the unknown data can be

Dark Horse programmer —————— > Local inner class & anonymous inner class

Label:-------Android Training, Java training, look forward to communicating with you! ----------If an inner class is defined in a method, the inner class is a local inner class, and the local inner class is only valid in that method. Because local

HDFs name node start

Label:In the Namenode class there is a main function, which is the entry function that initiates the Namenode node. A Namenode object is created in the main function of the Namenode class by Method Createnamenode (), and then the Namenode.join ()

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