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ALTER TABLE to add a composite primary key
...rson , place , thing . There can be duplicate persons, duplicate places, and duplicate things, but there can never be a dupicate person-place-thing combination.
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What is the current directory in a batch file?
...dp0 refers to the full path to the batch file's directory (static)
%~dpnx0 and %~f0 both refer to the full path to the batch directory and file name (static).
See also: What does %~dp0 mean, and how does it work?
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Paste in insert mode?
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Yep, I only recently learned of CTRL-R and it's extremely useful.
– Dan
May 20 '10 at 16:36
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Why do browsers match CSS selectors from right to left?
...hed by browser engines from right to left. So they first find the children and then check their parents to see if they match the rest of the parts of the rule.
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Connection to SQL Server Works Sometimes
...metimes able to connect to another server on the local network. It seems random whether a given connection attempt succeeds or fails. The connection is using a connection string in the form:
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How can I create and style a div using JavaScript?
How can I use JavaScript to create and style (and append to the page) a div, with content?
I know it's possible, but how?
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What are all the common undefined behaviours that a C++ programmer should know about? [closed]
... the number (e.g. int64_t i = 1; i <<= 72 is undefined)
Types, Cast and Const
Casting a numeric value into a value that can't be represented by the target type (either directly or via static_cast)
Using an automatic variable before it has been definitely assigned (e.g., int i; i++; cout <...
Copy object values in Visual Studio debug mode
...tudio debug mode it's possible to hover over variables to show their value and then right-click to "Copy", "Copy Expression" or "Copy Value".
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How to compute the sum and average of elements in an array?
...he elements of an array as well as averaging them out. How would I do this and implement it with the code I currently have? The elements are supposed to be defined as I have it below.
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Executing a command stored in a variable from PowerShell
I have a command that I have build and stored in a variable in PowerShell. This command works if I do a Write-Host and copy and paste into a standard cmd.exe window.
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