How do I perform this ActiveRecord query?
Let’s learn how do I perform this ActiveRecord query. The most accurate or helpful solution is served by Stack Overflow.
There are ten answers to this question.
Best solution
Both of the interfaces for Mongoid and ActiveRecord are similar enough so I think either or will work. I need a query to meet the following criteria. I need to know the number of days a particular type of cereal has been eaten in the last 10 days. The cereal can be eaten 10 times in one day, but I only need to know that the day has had at least 1 time that the cereal was eaten. So if today is 11th, and a user has eaten Fruity Pebbles 2 times on the 5th, 10 times on the 7th, and once on the 8th...
Answer:
Not sure I understood. Cereal.where(:last_eaten.gt => Date.today - 10.day) or something like that...
randombits at Stack Overflow Mark as irrelevant Undo
Other solutions
Real-time all-data query of huge historical data stored in transaction database will create heavy workload to database and heavily destroy the necessary low-latency of transaction system. Separating historical data from database to ensure the performance...
Answer:
Hello. I'll address your question as two separate but related ones: How can I organize my transactional...
Yuval Oren at Quora Mark as irrelevant Undo
In SQL, you can select many fields and perform basic arithmetic on them, by creating a query such as "SELECT ((field1 + field2)/2) as relevance, title, author from..."
Answer:
It's very easy: just download SlamData, an open source project that lets you run SQL on MongoDB, and...
John A. De Goes at Quora Mark as irrelevant Undo
If we have to perform range update query many times, Can we reduce the overall time? Edit - Can this be solved by applying DP or Hashing with BIT?
Answer:
Yes, it is possible in a special case. If all updates occur before queries, then updating the closed...
Rajkiran Rajkumar at Quora Mark as irrelevant Undo
i have two columns in a sql table that i need to perform math on (qty max - min onhand) during a query and display the calculated results in a field with the query results. i am using microsoft sql server management studio express to complete this. I...
Kevin K at Yahoo! Answers Mark as irrelevant Undo
I am converting an ASP script to a PHP script. The current script runs on an IIS 6.0 server running ASP.NET and PHP 4.4.8. The script connects to a database in the form of a .MDB file. I can successfully connect to the database using the PHP method odbc...
Answer:
"Name" is a restricted word in Microsoft Access and SQL Server. Try changing your query to...
William B at Yahoo! Answers Mark as irrelevant Undo
We are running a rails+mysql application. In my specific requirement I want all my developers to access mysql only throught the rails API. I want to disable all direct mysql queries outside rails. I need this because I have a lot of callbacks running...
Answer:
Just ask your developers not to write and run SQL queries directly on the connection object, and to...
James Stradling at Quora Mark as irrelevant Undo
When I enter a search query on Google (without Google Instant), how many processors (in the median case) perform work for this query? How about the extreme case, and if Google Instant is on as well?
Answer:
A single Google search engine query uses 1,000 servers in 0.2 seconds. Sources: http://www.computerweekly...
Wolf Garbe at Quora Mark as irrelevant Undo
Can you give me a reason for each of the following please?:) 1) Why is is a good idea to perform a 'sort'? 2) Why is it a good idea to perform a 'query'? Thanks x
Answer:
sort is used for sorting the data in ascending or descending order. if a customer is using your website...
Lala Lottexx at Yahoo! Answers Mark as irrelevant Undo
There are two fields in one collection "max" and "min". I have two integers X and y. I want to perform a query like this on the collection; find all the rows whose 'min'-y <= X <='max'+y. How can i do that [updated] in pymongo...
Answer:
It is possible to pass the exact query( 'min'-y <= X <='max'+y) in javascript as suggested by...
Answer Wiki at Quora Mark as irrelevant Undo
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