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Postgresql - change the size of a varchar column to lower length
I have a question about the ALTER TABLE command on a really large table (almost 30 millions rows).
One of its columns is a varchar(255) and I would like to resize it to a varchar(40) .
Basically, I would like to change my column by running the following command:
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Is there a pattern for initializing objects created via a DI container
I am trying to get Unity to manage the creation of my objects and I want to have some initialization parameters that are not known until run-time:
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How do I filter an array with AngularJS and use a property of the filtered object as the ng-model at
If I have an array of objects, and I want to bind the Angular model to a property of one of the elements based on a filter, how do I do that? I can explain better with a concrete example:
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What does it mean when a CSS rule is grayed out in Chrome's element inspector?
...ting an h2 element on a web page using Google Chrome's element inspector and some of the CSS rules--which appear to be applied--are grayed out. It seems that a strike-through indicates that a rule was overridden, but what does it mean when a style is grayed out?
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C++11 range based loop: get item by value or reference to const
... with copies.
Choose auto &x when you want to work with original items and may modify them.
Choose auto const &x when you want to work with original items and will not modify them.
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What is the Java string pool and how is “s” different from new String(“s”)? [duplicate]
What is meant by String Pool ? And what is the difference between the following declarations:
5 Answers
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Get timezone from DateTime
...ly means.
DateTimeOffset is somewhat better - that's basically a UTC time and an offset. However, that's still not really enough to determine the timezone, as many different timezones can have the same offset at any one point in time. This sounds like it may be good enough for you though, as all yo...
How to POST raw whole JSON in the body of a Retrofit request?
...aw data with the above declaration:
Use TypedByteArray to send raw bytes and the JSON mime type:
String json = "{\"foo\":\"kit\",\"bar\":\"kat\"}";
TypedInput in = new TypedByteArray("application/json", json.getBytes("UTF-8"));
FooResponse response = foo.postRawJson(in);
Subclass TypedString to ...
Unit Testing: DateTime.Now
...it tests that expects the 'current time' to be different than DateTime.Now and I don't want to change the computer's time, obviously.
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财务计算器拓展：复利计算、平均值、中位数、众数、方差计算 - App Invento...
...culator Extension
精心打造的“财务计算器”扩展，为您的Android应用程序增添先进的财务和统计功能。此扩展让您能够执行广泛的财务计算，从简单利息和复利到净现值和投资回报率。它还使您能够进行基本的统计计算，包括计...