As an iOS developer, it is often necessary to use command lines. Sometimes a long string of commands is really annoying, especially some common commands. We need to repeat the keyboard over and over again. However, laruence is generally not so
Linux: alias takes effect permanently
Alias allows you to use a shorter name to redefine Shell commands in Linux, thus simplifying command line input.
If you often deal with the CLI, using alias will not only save time, but also improve
First, let's look at the alias. In Ruby, we can create an alias for the method or global variable. What's interesting is that after the method alias is defined, even if the corresponding method isCodeAfter a new definition (that is, an internal
MySQL learning footprint record 14-table alias and self-join table used in this query: The following table num represents the bus route, such as 1 car, 2 car, stop with table parking site, such as Station A and Station B:
route;+------+------+| num
First with Xshell landing Centos7,First, the system directory structureIn the Command window, enterLS/LS is an abbreviation for list that lists the specified directory or file/is the root directory of the Linux operating system, all files and
Select Column1+10 as c1,c1+10 as C2 from table1;Want to achieve the above effect, the result in MySQL inside error, the hint can not find C1 this column;-Different databases are not the sameIt is not generally supported to continue using aliases in
MySQL learning footprint record 14 -- table alias and self-linked bitsCN.com
MySQL learning footprint record 14-table alias and self-join
Tables used in this query:
The following table num represents A bus route, such as A 1-way vehicle, A 2-way
A few days ago, the project used the push function, on the integration of the laser, encountered 2 problems, to share with you, the first question:The process of integration is done according to the laser documentation, but the final configuration
http://blog.163.com/chenhui_761217/blog/static/340737792010912103043831/
How to understand the default () method:
The default keyword is used because it is necessary to assign an initial value to an object instance without knowing whether the type
Principle. Therefore, the name "alias" is the essential meaning. The so-called "one thief first and one king" means that we must first understand the design principles when studying design patterns. All models are developed on the basis of these
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