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Is it faster to update or DELETE and insert?
Delete + Insert is almost always faster because an Update has way more steps involved.
Is it always always possible to perform SQL update DELETE insert statements on top of a view?
No, you can’t write a DELETE directly in the VIEW definition, it has to be a SELECT.
Which statement is used to insert update or DELETE bulk data?
The MERGE statement basically works as separate INSERT, UPDATE, and DELETE statements all within the same statement. You specify a “Source” record set and a “Target” table and the JOIN condition between the two.
How to delete records with no match in another table?
The query is easy to understand but wouldn’t perform great on large datasets. Another method would be to use to NOT EXISTS. This method should provide good performance provided there is an appropriate index to support the query. The final method uses a LEFT JOIN.
When to update or delete records in another table?
Several weeks ago I posted an article about Non-SELECT Joins in T-SQL and MySQL. The examples only covered INNER JOINS but sometimes we need to update, or delete, records in a table that do not have a corresponding record in another table. I’m going to illustrate the various methods for doing this in SQL Server and MySQL .
How to insert, updating and delete data in Microsoft Docs?
After updating Web.sitemap, take a moment to view the tutorials website through a browser. The menu on the left now includes items for the editing, inserting, and deleting tutorials. Figure 4: The Site Map Now Includes Entries for the Editing, Inserting, and Deleting Tutorials
How to insert, updating, and delete data in BLL?
Open the Basics.aspx page, drag an ObjectDataSource from the Toolbox onto the Designer, and click the Configure Data Source link from its smart tag. Since the ProductsBLL is the only BLL class that provides editing, inserting, and deleting methods, configure the ObjectDataSource to use this class.