35 hours ago · Problem. Please present step-by-step instructions for causing a view to change the rows it displays even when its is_updatable property is No. Demonstrate how to accomplish this with T-SQL inserts and deletes for views of the underlying tables for a view. Also, demonstrate T-SQL code for succinctly inserting multiple rows into the rows ... >> Go To The Portal
From the following table, write a SQL query to find those patients who had at least two appointments where the nurse who prepped the appointment was a registered nurse and the physician who has carried out primary care. Return Patient name as “Patient”, Physician name as “Primary Physician”, and Nurse Name as “Nurse”. Go to the editor 39.
From the following table, write a SQL query to find those patients who have been prescribed by some medication by his/her physician who has carried out primary care. Return Patient name as “Patient”, and Physician Name as “Physician”.
The view should not accept INSERT, UPDATE, or DELETE operations. Which of the following statements should you issue? Mark for Review 7. You can create a view if the view subquery contains an inline view.
To get the information of a view, you use the system catalog sys.sql_moduleand the OBJECT_ID()function: SELECTdefinition, uses_ansi_nulls, uses_quoted_identifier, is_schema_bound FROMsys.sql_modules WHEREobject_id = object_id( 'sales.daily_sales');
Using SQL Server Management StudioIn Object Explorer, expand the database that contains the view you want to delete, and then expand the Views folder.Right-click the view you want to delete and click Delete.In the Delete Object dialog box, click OK.
Use the DROP VIEW statement to remove a view or an object view from the database. You can change the definition of a view by dropping and re-creating it.
It's a View, if you have a read of that link, Microsoft do a good job of explaining what a view is and why someone might use one. "vw" is a common prefix for a View. If you expand the "Views" section in SSMS you should see the View call vwTournamentDetails .
In order to rebuild all views of a SQL Server database, you could use the following script: DECLARE @view_name AS NVARCHAR(500); DECLARE views_cursor CURSOR FOR SELECT TABLE_SCHEMA + '. ' +TABLE_NAME FROM INFORMATION_SCHEMA.
The DELETE command is used to delete existing records in a table.
DROP statementThe SQL DELETE statement is used to delete records from a table whereas the DROP statement is used to delete a table or a database. The TRUNCATE TABLE statement can also be used to delete records from a table.
SQL allows us to delete an existing View. We can delete or drop a View using the DROP statement. Syntax: DROP VIEW view_name; view_name: Name of the View which we want to delete.
In SQL, a view is a virtual table based on the result-set of an SQL statement. A view contains rows and columns, just like a real table. The fields in a view are fields from one or more real tables in the database.
To modify a viewIn Object Explorer, click the plus sign next to the database where your view is located and then click the plus sign next to the Views folder.Right-click on the view you wish to modify and select Design.More items...•
A recompilation is the same process as a compilation, just executed again. If the database structure or data change significantly, a recompilation is required to create a new query execution plan that will be optimal for the new database state and ensure better procedure performance.
The oldest and most traditional technique to not cache the query plans and compile your stored procedure or queries every single time to get optimal performance.
To compile a program again. A program is recompiled after a change has been made to it in order to test and run the revised version.
If you change the name of an object referenced by a view, you must modify the view so that its text reflects the new name. Therefore, before renaming an object, display the dependencies of the object first to determine if any views are affected by the proposed change.
In Object Explorer, click the plus sign next to the database that contains the view to which you want to view the properties, and then click the plus sign to expand the Views folder. Right-click the view of which you want to view the properties and select Properties.
To get dependencies on the view. In Object Explorer, expand the database that contains the view to which you want to view the properties, and then expand the Views folder. Right-click the view of which you want to view the properties and select View Dependencies.
The system stored procedure sp_helptext is not supported in Azure Synapse Analytics. Instead, use the sys.sql_modules object catalog view.
The sp_helptextstored procedure returns the definition of a user-defined object such as a view.
The OBJECT_ID()function returns an identification number of a schema-scoped database object.
SQL views are commonly used in relational databases. Relational databases offer various features, including SQL constraints like primary and foreign keys or indexing. These features can lead to complex queries.
How To Use Views in an SQL Query. Although SQL views are considered virtual tables, their usage does not differ from concrete tables. You can use a view just like any other table. Let’s look at an example using a view called FriendView that is built on top of the Person table. See the Person table below:
The access control to the data stored in the database is another reason why you should use SQL views. Usually, the rule of least privilege is followed (i.e., a user is given as limited privileges as possible that satisfy his/her requirements.) For example, if a user needs to read from table A, only the read privilege should be assigned to him/her and not the read/write privilege.
An SQL view is called a virtual table because it does not store the rows and columns on the disk like a concrete table. Instead, it just contains the SQL query.
This is a convenient way to get the desired data because it is easier to run a query stored in a view than to type a query from scratch. Hence, it is essential to be able to apply this feature efficiently.
However, under the hood, there is a difference between views and tables. A table (concrete table) stores its data in columns and rows in the database. A view (virtual table) is built on top of the concrete table (s) it fetches data from and does not store any data of its own in the database.
Although SQL views are considered virtual tables, their usage does not differ from concrete tables. You can use a view just like any other table.
As can be seen, instead of key lookup operator query plan displays RID Lookup operator because heaps don’t have clustering keys as clustered index do and instead they have row identifiers a.k.a RID. A RID is a row locator that includes information like database file, page, slot numbers and helps to identify specific rows quickly. Point to be noted here is, every row in a nonclustered index that is created on a heap contains RID of the corresponding record.
A RID is a row locator that includes information like database file, page, slot numbers and helps to identify specific rows quickly. Point to be noted here is, every row in a nonclustered index that is created on a heap contains RID of the corresponding record.
If result set is small, then this isn’t anything to be worried about but if RID lookup returns many records we should start looking at re-writing the query or to define appropriate clustered or covering index.
Kanchan is an astute IT professional, a seasoned SQL Database Administrator with 13+ years of industry experience. A calculated risk taker with deep technical knowledge and has gained proficiency in database consulting and solutions across different environments. Kanchan holds MBA degree in IT and an International Executive MBA in Project Management. He is very passionate about SQL Server and holds MCSE (Data Platform), MCSA – SQL 2012, MCITP – SQL 2008 certifications. Currently he is focusing on cloud and latest releases of SQL Server. When not working, Kanchan likes to spend his time reading on new technical developments specifically on SQL Server and other related technologies.
Non- clustered indexes can exist both on heaps as well as objects with clustered indexes and it is possible to have a key lookup on a heap.It is reflected in query plans as SQL Server RID Lookup; following statement will produce same execution plan.
An inline view is a subquery in the FROM clause, often named with an alias. (*)
The CREATE VIEW statement generates an error.
To achieve all of the desired results this ORDER ON clause should be added to the CREATE VIEW statement: 'ORDER ON salary, last_name, first_name'.
The statement failed to execute because the ORDER BY clause does NOT use the Top-n column.
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The statements will NOT return all of the desired results because the WITH CHECK OPTION clause is NOT included in the CREATE VIEW statement.
A CREATE VIEW statement CAN contain a join query. (*)