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Postgres unique constraint vs index
...ion (not only on column) and define some other parameters (collation, sort order, NULLs placement).
You cannot add table constraint using partial index.
alter table master add column part_id integer;
create unique index master_partial_idx on master (part_id) where part_id is not null;
alter table...
Explanation of BASE terminology
...the requirements for immediate consistency, data freshness and accuracy in order to gain other benefits, like scalability and resiliency.
BASE stands for -
Basic Availability - The database appears to work most of the time.
Soft-state - Stores don't have to be write-consistent, nor do different...
How can I display just a portion of an image in HTML/CSS?
...he image you want to display as a background in a container (td, div, span etc) and then adjust background-position to get the sprite you want.
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PHP method chaining?
...;setBaz(2) vs $table->select()->from('foo')->where('bar = 1')->order('ASC). The latter spans multiple objects.
– Gordon
Sep 16 '10 at 7:32
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Java's final vs. C++'s const
...would do:
class Bar {
public:
virtual void foo() const final;
};
(The order of const and final here is required).
Previously there wasn't a direct equivalent of const member functions although making functions non-virtual would be a potential option albeit without causing an error at compile t...
How do I run a node.js app as a background service?
...ly every Linux distro comes with systemd, which means forever, monit, PM2, etc are no longer necessary - your OS already handles these tasks.
Make a myapp.service file (replacing 'myapp' with your app's name, obviously):
[Unit]
Description=My app
[Service]
ExecStart=/var/www/myapp/app.js
Restart...
SQL Server String or binary data would be truncated
...ths may all match, but perhaps you are specifying the columns in the wrong order in your SELECT statement. Say tableX and tableY have columns with the same name, but in different order
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How can I change the color of AlertDialog title and the color of the line under it
...ddress example you give in your original question.
With QustomDialog, in order to create a basic dialog (title, message) with a desired different color for the title or divider, you use the following code:
private String HALLOWEEN_ORANGE = "#FF7F27";
QustomDialogBuilder qustomDialogBuilder = new...
Where is Java's Array indexOf?
...here are four considerations:
The array must be sorted either in natural order or in the order of a Comparator that you provide as an argument, or at the very least all elements that are "less than" the key must come before that element in the array and all elements that are "greater than" the key...
What is the difference between customErrors and httpErrors?
...so handle content that doesn't go through the .net handler (e.g. .png, .js etc.) If you want error pages for non-.net content types, use IIS error pages (httpErrors for IIS7, the UI for IIS6.)
– zcrar70
May 24 '11 at 8:53
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