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What is float in Java?
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In Java, when you type a decimal number as 3.6, its interpreted as a double. double is a 64-bit precision IEEE 754 floating point, while floatis a 32-bit precision IEEE 754 floating point. As a float is less precise than a double, the conversion cannot ...
How to create index on JSON field in Postgres?
...ublishers(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 latter as a JSON object.
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What is RPC framework and Apache Thrift?
...Thrift for a University project. As this tutorial says, it is an RPC framework, and it was the only document I could find for Thrift other than their documentation .
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Remove data.frame row names when using xtable
OK, I admit this one is a bit uptight (read: "stupid"), and I assume it's quite easy too. I'm writing a report and I want to use xtable package for LaTeX table generation (note that memisc package does the job, but say I want to do this solely with xtable ).
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Coredata Error “data: ”
I try to pull out data from CoreData with the following code
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Calculate a percent with SCSS/SASS
I want to set a width in percentage in scss via calculation, but it gives me errors..
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reference assignment is atomic so why is Interlocked.Exchange(ref Object, Object) needed?
In my multithreaded asmx web service I had a class field _allData of my own type SystemData which consists of few List<T> and Dictionary<T> marked as volatile . The system data ( _allData ) is refreshed once in a while and I do it by creating another object called newData and fill...
“open/close” SqlConnection or keep open?
I have my business-logic implemented in simple static classes with static methods. Each of these methods opens/closes SQL connection when called:
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Doctrine 2 can't use nullable=false in manyToOne relation?
An User has one Package associated with it. Many users can refer to the same package. User cannot exists without a Package defined. User should own the relation. Relation is bidirectional, so a Package has zero or more users in it.
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How to debug JavaScript / jQuery event bindings with Firebug or similar tools?
...e FireQuery. It shows any events attached to DOM elements in the Firebug's HTML tab. It also shows any data attached to the elements through $.data.
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