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postgresql - add boolean column to table set default
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Note that if your table is big this can take a long time and lock the table for the entire time. It's faster to split it into steps: add the column without a default with ALTER TABLE users ADD COLUMN priv_user BOOLEAN;, then UPDATE users SET priv_user = 'f'; and finally if you need...
How do I revert master branch to a tag in git?
We have branches origin and develop.
The initial state of master was tagged at tag_ABC .
2 Answers
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How do I remove the old history from a git repository?
...e graft, it takes effect right away; you should be able to look at git log and see that the unwanted old commits have gone away:
$ echo 4a46bc886318679d8b15e05aea40b83ff6c3bd47 > .git/info/grafts
$ git log --decorate | tail --lines=11
commit cb3da2d4d8c3378919844b29e815bfd5fdc0210c
Author: Your ...
How to minify php page html output?
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CSS and Javascript
Consider the following link to minify Javascript/CSS files: https://github.com/mrclay/minify
HTML
Tell Apache to deliver HTML with GZip - this generally reduces the response size by about 70%. (If you use Apach...
In node.JS how can I get the path of a module I have loaded via require that is *not* mine (i.e. in
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If I correctly understand your question, you should use require.resolve():
Use the internal require() machinery to look up the location of a module, but rather than loading the module, just return the resolved filename.
Example: var pathToMo...
Differences between fork and exec
What are the differences between fork and exec ?
9 Answers
9
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What is the difference between a map and a dictionary?
... values. Isn't a dictionary the same? What is the difference between a map and a dictionary 1 ?
11 Answers
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Removing a model in rails (reverse of “rails g model Title…”)
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:( Read the first line and did it. It was my fault, but a correctly-ordered answer may have helped.
– Mike T
Jul 22 '13 at 19:40
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Redirect stderr and stdout in Bash
I want to redirect both stdout and stderr of a process to a single file. How do I do that in Bash?
15 Answers
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How do I bind a WPF DataGrid to a variable number of columns?
...ableColumnsPropertyChanged: 1. Check dataGrid for null before accessing it and throw an exception with good explanation about binding only to DataGrid. 2. Check e.OldValue for null and unsubscribe from CollectionChanged event to prevent memory leaks. Just for your convince.
– M...