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How to create index on JSON field in Postgres?
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Found:
CREATE TABLE publishers(id INT, info JSON);
CREATE INDEX ON publishers((info->>'name'));
As stated in the comments, the subtle difference here is ->> instead of ->. The former one returns the value as text, the lat...
How to print HTML content on click of a button, but not the page? [duplicate]
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I came across another elegant solution for this:
Place your printable part inside a div with an id like this:
<div id="printableArea">
<h1>Print me</h1>
</div>
<input type="button" onclick="printDiv('printableArea')" value="print a div!" />
Now let'...
How can I get a list of all functions stored in the database of a particular schema in PostgreSQL?
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After some searching, I was able to find the information_schema.routines table and the information_schema.parameters tables. Using those, one can construct a query for this purpose. LEFT JOIN, instead of JOIN, is necessary to retrieve functions without parameters.
SELECT routines.routine_name, pa...
Why is the Fibonacci series used in agile planning poker? [closed]
...nd verbal description in the software domain is closer to the one shown in Table 3 than to Saaty’s." And in this table we see that something is called "slightly bigger" if it is 125% of the base size and it is called "bigger", if it is 175% of the base size.
– asmaier
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How to reset a form using jQuery with .reset() method
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I've finally solve the problem!!
@RobG was right about the form tag and table tag. the form tag should be placed outside the table. with that,
<td><input type="reset" id="configreset" value="Reset"></td>
works without the need of jquery or anything else. simple click on the ...
How do I do top 1 in Oracle?
...inal query doesn't have an ORDER BY, nor does it return all columns in the table.
– OMG Ponies
Aug 12 '10 at 15:37
I s...
ORDER BY the IN value list
...ed.
We don't need a subquery, we can use the set-returning function like a table.
A string literal to hand in the array instead of an ARRAY constructor may be easier to implement with some clients.
Detailed explanation:
PostgreSQL unnest() with element number
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Detecting which UIButton was pressed in a UITableView
I have a UITableView with 5 UITableViewCells . Each cell contains a UIButton which is set up as follows:
26 Answers
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How can I avoid running ActiveRecord callbacks?
... in any way, consider using a "shadow object" pointing to your existing db table. Like so:
class ImportedPerson < ActiveRecord::Base
self.table_name = 'people'
end
This works with every version of Rails, is threadsafe, and completely eliminates all validations and callbacks with no modificat...
Entity Framework 4 vs NHibernate [closed]
...hat EF4 has more flexible inheritance mapping. For instance, you can use 2 tables (TPT) as base class + level 1 class and add discriminator to level 1 table, allowing spliting to level 2 classes. In NH, discriminator can only be defined on base class.
– Danny Varod
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