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How to grab data from two tables into one view?
Is it possible to grab data from two tables (that have the same fields) into one view. Basically, so the view sees the data as if it was one table. …requires that there be the same number of columns, and the data types match at each position.
Often, data in two tables are related to each other through a third table. This is usually the case because the data between the first two tables are related in a many-to-many relationship. Often, it is good database design practice to split a many-to-many relationship between two tables into two one-to-many relationships involving three tables.
Where can I find the definition of a view?
You can gain information about a view’s definition or properties in SQL Server by using SQL Server Management Studio or Transact-SQL. You may need to see the definition of the view to understand how its data is derived from the source tables or to see the data defined by the view.
How is a query related to a third table?
The query returns a list of orders, each with its shipping fee and the first and last name of the employee who handled it. Often, data in two tables are related to each other through a third table. This is usually the case because the data between the first two tables are related in a many-to-many relationship.
Why are columns not shown in view name?
Note: The columns in the view are set at the time the view is created. Adding columns to table_1 and table_2 after view creation will not show up in view_name. You will need to re-run the above DDL to get new columns to show up.
Is it better to use one view or another?
There’s no performance benefit, and can negatively impact performance if you build a view based on another. Also, views are brittle – they can change, and you won’t know until using a supporting view if there are issues. Note: The columns in the view are set at the time the view is created.
Is it bad to combine multiple tables into one table?
While this can make finding what you need easier in the short term, it can also present problems in the long term.