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How to UPSERT (MERGE, INSERT … ON DUPLICATE UPDATE) in PostgreSQL?
... CONFLICT (key) DO UPDATE (and ON CONFLICT (key) DO NOTHING), i.e. upsert.
Comparison with ON DUPLICATE KEY UPDATE.
Quick explanation.
For usage see the manual - specifically the conflict_action clause in the syntax diagram, and the explanatory text.
Unlike the solutions for 9.4 and older that are g...
How to apply a Git patch to a file with a different name and path?
I have two repositories. In one, I make changes to file ./hello.test . I commit the changes and create a patch from that commit with git format-patch -1 HEAD . Now, I have a second repository that contains a file that has the same contents as hello.test but is placed in a different directory under...
PostgreSQL: Is it better to use multiple databases with one schema each, or one database with multip
After this comment to one of my question, I'm thinking if it is better using one database with X schemas or vice versa.
5...
Best JavaScript compressor [closed]
What is the the best JavaScript compressor available? I'm looking for a tool that:
13 Answers
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Should I use int or Int32
...nt32. As a matter of style, use of the keyword is favoured over use of the complete system type name.
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How do you write a migration to rename an ActiveRecord model and its table in Rails?
...tion file manually.
Edit:
In Rails 3.1 & 4, ActiveRecord::Migration::CommandRecorder knows how to reverse rename_table migrations, so you can do this:
class RenameOldTableToNewTable < ActiveRecord::Migration
def change
rename_table :old_table_name, :new_table_name
end
end
(You s...
How to Disable landscape mode in Android?
...e"
android:screenOrientation="portrait" />
EDIT: Since this has become a super-popular answer, I feel very guilty as forcing portrait is rarely the right solution to the problems it's frequently applied to.
The major caveats with forced portrait:
This does not absolve you of having to thi...
Show a popup/message box from a Windows batch file
...ld make a very simple VBScript file and call it using CScript to parse the command line parameters.
Something like the following saved in MessageBox.vbs:
Set objArgs = WScript.Arguments
messageText = objArgs(0)
MsgBox messageText
Which you would call like:
cscript MessageBox.vbs "This will be s...
Yank file name / path of current buffer in Vim
..., in particular if you need the directory without filename - stackoverflow.com/a/2233924/1882064
– arcseldon
Oct 30 '17 at 22:39
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Are class names in CSS selectors case sensitive?
...hich have no semantics associated with them), or because it's difficult to come up with a usable syntax.
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