Synonyms (study notes) and synonyms (study notes)Synonym = table alias
Syntax:CREATE [PUBLIC] SYNONYM name FOR database object;
Example 1,
-- Users created by the administrator or users with the permission to CREATE synonyms -- CREATE the synonym conn sys/change_on_install as sysdba for scott; create synonym myemp FOR scott. emp -- use scott to log on to select * from myemp; -- the effect is the same as
Web Front-end Study Notes 3, Web Study Notes 3
1. meta tag.
1.1
Charset: Character Set
1.2
1.3
1.4
2. link tag.
2.1
2.2
3. table
Purpose: display data.
Composition: table: Define table tr: Row td: column (cell)
Property: border: set table border width: set table width height: set table height cellspacing: Set the cell table distance (2 by default) cellpadding: Set the distance between text and cell b
Canvas Study Notes 1: basic understanding, canvas Study Notes
Attribute
If you do not set a style for the canvas, the canvas will be a transparent rectangle, unless the image is drawn above.Feedback
If the browser does not support the Drawing Context
To draw a drawing on a canvas, you must obtain the drawing context of the canvas and draw a drawing and image on the canvas through the drawing context. To d
TDD Study Notes [4] --- How to isolate dependencies and tdd Study NotesPreface I believe that many readers have heard of "testability" and even those who want to survive it. They also feel that it is simply inexplicable and futile. In this article, we will focus on the dependency between objects and the direct dependency between objects. To avoid design and test problems caused by dependency, this article w
TDD Study Notes [1] ---- preface: Preface to tdd Study NotesQuestions about most TDD programmers:
The last thought is:
1. Unit Test. That's all about it.
2. Unit Test? No time!
3. TDD is just a hype. In real development, who has written a whole system using TDD?
4. TDD only writes test programs first. What's special?
TDD development sequence
Because every link is closely linked, some stages are not so easy
Html5 Study Notes-2016/4 and html5 Study Notes 2016
Structure elements added to HTML5:
Section article aside header hgroup footer nav figure
Other elements added to HTML5:
Video audio embed mark progress time ruby rt rp wbr
Canvas command details datalist datagrid keygen output source menu
Type of the input element added to HTML5:
Email url number range Date Pickers
New HTML attributes:
Form-related attribu
WPF Study Notes 1--XAML 1, wpf Study Notes xaml
References:
Http://msdn.microsoft.com/zh-cn/library/ms752059 (v = vs.110). aspx
Pro WPF 4.5 in C #
I. XAML Overview
1. What is XAML?
Extensible Application Markup Language (read as zammel) is a declarative Markup Language used to instantiate. Net.
2. What is the purpose of XAML?
When you use Visual Studio to write a WPF program, the Window you designed
APUE Study Notes-record 1, APUE Study Notes-record
It has been almost a week since we started to see APUE. It is rare that we will not be disturbed by the three-day free holiday because we have just caught up with the Tomb Sweeping Day holiday in the past few days, now that you have read the first six chapters, most of the routines are also compiled and debugged. However, I always thought that I would forge
A Preliminary Study on Android development Singleton mode and a preliminary study on android Development
What is the singleton mode? It is one of the models in Java 23 and is also widely used in Android development. For example, the Calander class does not use new Calander but Calander when creating objects. getInstnce () is an application of the singleton mode. What are the application scenarios? In many c
Self-study Android notes -- Case Study of Returning data in the Activity (Equipment Selection), androidactivity1. Create a program:
The above layout Code uses the control ProgressBar (progress bar), which is used to display the baby's life value, attack value and sensitivity. ProgressBar is usually used to access the network to display the Loading dialog box and the Progress displayed when downloading fi
Linux Study Notes (11) software package management, linux Study Notes
Linux software packages include the source code package (script installation package) and Binary Package (RPM package and system default package ). The advantages of the source code package are:
1) The source code package is open-source. If you have sufficient capabilities, you can modify the source code;
2) You can freely select the requ
CentOS Study Notes-start, ROOT password, and centos Study NotesStartup Process Overview
Simply put, the process of system startup can be merged into the following process:
Load BIOS hardware information and perform self-testing, and obtain the first device that can be started according to the configuration;
Read and run the boot Loader (grub, spfdisk, and other programs) of MBR in th
Linux O M Study Notes MySQL backup and recovery (incremental recovery) tutorial, Study Notes mysql
Chapter 2 MySQL backup and recovery advanced-incremental recovery
I. Under what circumstances do I need incremental database recovery?
1. Do I need incremental recovery if the master database or slave database goes down due to hardware damage?
No. The master database goes down. You only need to switch the fas
Linux coredump Study Notes and coredump Study Notes
Beginner's notes:In the case of exceptions in linux programs, the process will be down. Most servers will set up to generate core files. In actual operation, I have encountered a process that keeps core and is automatically monitored and pulled up, if a core exists after a period of time, the disk is fully occupied and the service is affected.
After learni
[Study Notes] [C Language] array, Study Notes Array1. What is an array?
Array, literally, it means a group of data. Yes, arrays are used to store a group of data.2. array features
Only one type of data can be stored, such as an array of the int type and an array of the float type.
The stored data is called an "element"3. Definition
Declare the array type
Declare the number of elements in the array (How much
My MYSQL Study Notes (1), MYSQL Study Notes (
This is my personal notes for learning MYSQL through online articles. I hope this will help you.1. DEFUALT keywords
CREATE TABLE emp(id INT DEFAULT 12)
2. Set the auto-increment column (auto_increment)
create table temp2( id INT primary KEY auto_increment, tname INT)
The step size cannot be set for the mysql auto-increment column.View the default auto-in
My MYSQL Study Notes (3) -- operators, mysql Study Notes
1. Security equals operator (
Select null
Note that the difference between this operator and equal to (=) is that when both values are null, the execution result is as follows: 2. LEAST OperatorPurpose: obtain the minimum value among multiple parameter values.Note: Do not use hybrid Data Types
SELECT least (2, 0), LEAST ('A', 'B', 'C', 'D'), lea
Lua Study Notes 11: Tips in lua, lua Study Notes
The tips in lua are the special features of the basic lua language.
Clever Use or
x = x or v
It is equivalent:
if not x then x = vend
If x is nil or false, assign it a value
Binary ternary operator implementation
a and b or c
Similar to C language:
a ? b : c
The and operation takes precedence over or.
Fill in 0 for the third digit
str = string
March 31 Study Notes (CSS part), March 31 Study Notes css
Background attributes
Text attributes
The direction attribute affects the writing direction of the text in the block-level element, the direction of the column layout in the table, the direction of the element box filled with content horizontally, and the position of the last row in the alignment element at both ends.
Note: For intra-row e
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