How to select only the records with the highest date in LINQ?
How can I, in LINQ to SQL, only get the last lasttrace of every AccountId (the one with the highest date)? var q = from n in table group n by n.AccountId into g select g.OrderByDescending (t=>t.Date).FirstOrDefault ();
How to use LINQ to select object with minimum or?
Other custom IEnumerable implementations could also make use of indexes (see i4o: Indexed LINQ, or the object database db4o) and make this solution faster than Aggregate () or MaxBy () / MinBy () which need to iterate the whole collection once.
Which is the best extension to use for LINQ?
You can use existing linq extension out there like MoreLinq. But if you just need only these methods, then you can use the simple code here: Thanks for contributing an answer to Stack Overflow!
Why is LINQ to objects so slow in C?
This solution’s “slowness” depends on the underlying data. If this is a array or List , then LINQ to Objects has no choice but to sort the entire collection first before selecting the first item. In this case it will be slower than the other solution suggested.
How to select group from table with Max date?
SELECT group, date, checks FROM ( SELECT *, max_date = MAX(date) OVER (PARTITION BY group) FROM table ) AS s WHERE date = max_date ; to get the desired result. Basically, this is similar to @Twelfth’s suggestion but avoids a join and may thus be more efficient.
How to select only rows with Max date?
Using the above output as a derived table, you can then get only rows where date matches max_date: to get the desired result. Basically, this is similar to @Twelfth’s suggestion but avoids a join and may thus be more efficient. You can try the method at SQL Fiddle.
What do you need to develop an API in node?
The following software components are required before we can begin developing the API: Generally, it is really simple to get started with the installation of the required elements. To get started, first we need to initialize our node project. We can do that by simply running the following command in the terminal:
When to use db.collection.insertmany in MongoDB?
db.collection.insertMany() can be used inside multi-document transactions. The collection must already exist. An insert operation that would result in the creation of a new collection are not allowed in a transaction. Do not explicitly set the write concern for the operation if run in a transaction.
How to quickly build an API using Node.js and PostgreSQL?
This article describes how you can use Node.js and PostgreSQL to create an API and provides an example for how to create a table. 1. Why Use Node.js and PostgreSQL? 2. Getting started 3. Creating an API It is critical for software systems to have a seamless communication system to mutually communicate all the important details.