Writing Complex Queries Using LINQ And Lambda.
So far, the queries you have seen return an entire object, comparable to writing a SELECT SQL query requesting every column in a table. By returning an entire object in your query, you will get all of the benefits associated with the entity classes—the most important of which is the ability to keep track of changes to an entity class for database updates.
T-SQL Subquery examples - How to write subquery in an SELECT statement using the operators like: in, exists, all, any or some.
A Subquery or Inner query or Nested query is a query within another SQLite query and embedded within the WHERE clause. A subquery is used to return data that will be used in the main query as a condition to further restrict the data to be retrieved.
A subquery can be nested inside other subqueries. SQL has an ability to nest queries within one another. A subquery is a SELECT statement that is nested within another SELECT statement and which return intermediate results. SQL executes innermost subquery first, then next level. See the following examples: Example -1: Nested subqueries.
Linq-to-Entities Query. Here, you will learn how to write LINQ-to-Entities queries and get the result in Entity Framework 6.x as well as in Entity Framework Core. Visit LINQ Tutorials to learn LINQ step by step. The DbSet class is derived from IQuerayable. So, we can use LINQ for querying against DbSet, which will be converted to an SQL query. EF API executes this SQL query to the underlying.
A correlated subquery is one way of reading every row in a table and comparing values in each row against related data. It is used whenever a subquery must return a different result or set of results for each candidate row considered by the main query. In other words, you can use a correlated subquery to answer a multipart question whose answer depends on the value in each row processed by the.
Also in linq High Performance PowerShell with LINQ PowerShell is a scripting language, and like all scripting languages it struggles to perform well with rapid iterative processes such as aggregation. It isn't well-known that PowerShell can use LINQ for many of those tasks which would otherwise use iteration, though somewhat awkwardly. However.