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- MySQL: @variable vs. variable. Whats the difference?
In MySQL, @variable indicates a user-defined variable You can define your own SET @a = 'test'; SELECT @a; Outside of stored programs, a variable, without @, is a system variable, which you cannot define yourself The scope of this variable is the entire session That means that while your connection with the database exists, the variable can still be used This is in contrast with MSSQL
- Defining and using a variable in batch file - Stack Overflow
370 The spaces are significant You created a variable named 'location ' with a value of ' "bob"' Note - enclosing single quotes were added to show location of space If you want quotes in your value, then your code should look like set location="bob" If you don't want quotes, then your code should look like set location=bob Or better yet set
- What does the @ symbol before a variable name mean in C#?
I understand that the @ symbol can be used before a string literal to change how the compiler parses the string But what does it mean when a variable name is prefixed with the @ symbol?
- JavaScript OR (||) variable assignment explanation - Stack Overflow
Agreed, this is my favorite answer as it specifically addresses JavaScript variable assignment concerns Additionally, if you choose to use a ternary as one of the subsequent variables to test for assignment (after the operator) you must wrap the ternary in parentheses for assignment evaluation to work properly
- Difference between %variable% and !variable! in batch file
The value of the !_var! variable is evaluated as late as possible while the %_var% variable works just as before Delayed Expansion will cause variables within a batch file to be expanded at execution time rather than at parse time This will allow you to always read the current value of the variable
- Passing additional variables from command line to make
From command line - make can take variable assignments as part of its command line, mingled with targets: make target FOO=bar But then all assignments to FOO variable within the makefile will be ignored unless you use the override directive in assignment (The effect is the same as with -e option for environment variables)
- How do I use extern to share variables between source files?
The clean, reliable way to declare and define global variables is to use a header file to contain an extern declaration of the variable The header is included by the one source file that defines the variable and by all the source files that reference the variable For each program, one source file (and only one source file) defines the variable
- List all environment variables from the command line
Is it possible to list all environment variables from a Windows' command prompt? Something equivalent to PowerShell's gci env: (or ls env: or dir env:)
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