How do I join two tables with multiple conditions in Linq?

How do I join two tables with multiple conditions in Linq?

We can apply join on multiple table on condition base.

1. var q = (from product in dataContext.Products join order in dataContext.Orders on product.ProductId equals order.ProductId join cust in dataContext.Customers on order.CustomerId equals cust.CustomerId orderby order.OrderId select new {
2. order.OrderId,

Can we have multiple conditions for the ON clause?

You can specify multiple conditions in a single WHERE clause to, say, retrieve rows based on the values in multiple columns. You can use the AND and OR operators to combine two or more conditions into a compound condition. If the result of a compound condition is false or unknown, the row is excluded from the result.

What is group join in Linq?

In simple words, we can say that Linq Group Join is used to group the result sets based on a common key. So, the Group Join is basically used to produces hierarchical data structures. Each item from the first data source is paired with a set of correlated items from the second data source.

What is include in LINQ query C#?

As a performance measure, Include() allows you to indicate which related entities should be read from the database as part of the same query.

What is DefaultIfEmpty in LINQ?

The DefaultIfEmpty operator is used to replace an empty collection or sequence with a default valued singleton collection or sequence. Or in other words, it returns a collection or sequence with default values if the source is empty, otherwise return the source.

Which join is the same as the Cartesian product between two tables?

CARTESIAN JOIN: The CARTESIAN JOIN is also known as CROSS JOIN. In the absence of a WHERE condition the CARTESIAN JOIN will behave like a CARTESIAN PRODUCT . i.e., the number of rows in the result-set is the product of the number of rows of the two tables.

What is the difference between inner join and outer join?

The major difference between inner and outer joins is that inner joins result in the intersection of two tables, whereas outer joins result in the union of two tables.

How use multiple IF condition in SQL query?

If you are checking conditions against multiple variables then you would have to go for multiple IF Statements, Each block of code will be executed independently from other blocks. ELSE IF(@ID IS NOT NULL AND @ID in (SELECT ID FROM Places)) — Outer Most Block ELSE IF BEGIN SELECT @MyName = Name …

What is the difference between Join and Group Join in Linq?

Linq let you query a collection and one of its possible action is the GroupJoin. A GroupJoin is in SQL what we call a “Left Outer JOIN” while a Join in SQL refer to “Inner Join”. In contrast, the Join will link 2 entities only if both entities contain a link between them. …

What is difference between include and join in Entity Framework?

3 Answers. An Included is intended to retain the original object structures and graphs. A Join is needed to project a flattened representation of the object graph or to join types which are not naturally related through the graph (ie. join the customer’s city with a shipping facility’s city).

What is eager load?

Eager loading is the process whereby a query for one type of entity also loads related entities as part of the query. Eager loading is achieved by the use of the Include method. It means that requesting related data be returned along with query results from the database.

How do I join data in tableau?

How to Join in Tableau. 1. Connect to Sample-Superstore dataset: Open the Tableau Desktop and select the “Sample-Superstore” dataset. 2. Go to Data source. 3. Select the “People” sheet and drag-n-drop along with “Orders” sheet: After you click on the “Data Source” in 2nd step, you will see that the data of “Orders” sheet is already been selected.

How do I join two tables in SQL query?

Sometimes, however, you will have to manually join two tables in the query design window. You can manually join two tables by dragging a field from one table’s field list to the matching field in the other table’s field list, as shown in figure.

How do you merge two tables in SQL?

Combine multiple tables into one by Merge table command. Also, you can use the Merge table command in context menu to merge two tables. 1. Click at anywhere of the table you want to drag, then the cross sign will be appeared, then select the cross sign to select the whole table. 2. Press Ctrl + X to cut the table,…