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Rails: Adding an index after adding column
Suppose I created a table table in a Rails app. Some time later, I add a column running:
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How do I use Linq to obtain a unique list of properties from a list of objects?
I'm trying to use Linq to return a list of ids given a list of objects where the id is a property. I'd like to be able to do this without looping through each object and pulling out the unique ids that I find.
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Android Fragment onClick button Method
I'm trying to invoke the method in my onClick (View v) XML, but does not work with Fragment. This is the error.
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Only one expression can be specified in the select list when the subquery is not introduced with EXI
My query is as follows, and contains a subquery within it:
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MVC 5 Seed Users and Roles
I have been playing about with the new MVC 5, I have a few models, controller and views setup using code first migrations.
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PostgreSQL - fetch the row which has the Max value for a column
I'm dealing with a Postgres table (called "lives") that contains records with columns for time_stamp, usr_id, transaction_id, and lives_remaining. I need a query that will give me the most recent lives_remaining total for each usr_id
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android.view.InflateException: Binary XML file: Error inflating class fragment
I have a very frustrating error that I cannot explain. I created an Android application that uses Android AppCompat to make it compatible with older versions. Here is my main activity layout file:
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SQL Server Insert if not exists
I want to insert data into my table, but insert only data that doesn't already exist in my database.
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What are naming conventions for MongoDB?
Is there a set of preferred naming conventions for MongoDB entitites such as databases, collections, field names?
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How to iterate object in JavaScript? [duplicate]
I have this object. I want to iterate this object in JavaScript. How is this possible?
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