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
What does $_ mean in PowerShell? - Stack Overflow $_ is a variable created by the system usually inside block expressions that are referenced by cmdlets that are used with pipe such as Where-Object and ForEach-Object But it can be used also in other types of expressions, for example with Select-Object combined with expression properties
What does the @ symbol before a variable name mean in C#? Firstly, it allows you to use a reserved keyword as a variable like this: int @int = 15; The second option lets you specify a string without having to escape any characters For instance the '\' character is an escape character so typically you would need to do this: var myString = "c:\\myfolder\\myfile txt" alternatively you can do this:
Defining and using a variable in batch file - Stack Overflow Consider also using SETX - it will set variable on user or machine (available for all users) level though the variable will be usable with the next opening of the cmd exe ,so often it can be used together with SET:
SQL Server SELECT INTO @variable? - Stack Overflow I found your question looking for a solution to the same problem; and what other answers fail to point is a way to use a variable to change the name of the table for every execution of your procedure in a permanent form, not temporary So far what I do is concatenate the entire SQL code with the variables to use Like this:
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
JavaScript OR (||) variable assignment explanation - Stack Overflow In summary, this technique is taking advantage of a feature of how the language is compiled That is, JavaScript "short-circuits" the evaluation of Boolean operators and will return the value associated with either the first non-false variable value or whatever the last variable contains
Set variable with multiple values and use IN - Stack Overflow FYI, in SQL Server 2008 and above, the following syntax is also valid for inserting multiple explicit values into a table variable: `insert into @values values ('A'),('B'),('C') – Chiramisu Commented Jun 21, 2013 at 23:36
Where are environment variables stored in the Windows Registry? M Specifies that the variable should be set in the system wide (HKEY_LOCAL_MACHINE) environment The default is to set the variable under the HKEY_CURRENT_USER environment S system Specifies the remote system to connect to