A virtual table that represents the data in one or more tables in an alternative way.

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15
votes
3answers
5k views

Determining how a schema change occurred?

Something bad happened yesterday. A view that was created sometime back ago was modified by someone which eventually broke the reports. Unfortunately. somebody (knowingly or unknowingly) did this ...
7
votes
3answers
14k views

Modify DEFINER on Many Views

I have am having problems backing up my databases after an update. I have been poking around on my system trying to figure out why. One query I ran returned this result. Got error: 1449: The user ...
5
votes
2answers
612 views

Window functions cause awful execution plan when called from a view with external parametrized 'where' clause

I had this issue long time ago, I found a workaround which suited me and forgot about it. But now there's that question on SO so I'm willing to bring this problem up. There's a view that joins few ...
4
votes
2answers
11k views

SQL query to return a column per date in date range?

Let me explain what I've got and what I'm trying to achieve. Let's say I have Table A: BookingsPerPerson Person_Id ArrivalDate DepartureDate 123456 2012-01-01 2012-01-04 213415 ...
1
vote
1answer
67 views

Why am I getting different results from a query vs. a view

The base problem I'm facing is that I need the latest record for each item. A little setup... MySQL 5.6.14. I need to create two views (because MySQL won't let me have a subquery in a view). My ...
13
votes
3answers
5k views

Is nested view a good database design?

I have read somewhere long time ago. The book states that we should not allow to having a nested view in SQL Server. I am not sure the reason why we can't do that or I might remember incorrect ...
5
votes
2answers
1k views

How do I get the execution plan for a view?

I have a schema with a number of views. I need to check the execution plans to make sure the appropriate indexes are in place and being used. How do I do this? I'd rather not have to copy and paste ...
4
votes
1answer
1k views

need suggestions to improve view performance

I am looking to improve the performance of a view in SQL Server 2008. This view exists in a reporting database that is widely used by not-very-technical-folk to basically denormalize all of these ...
4
votes
2answers
3k views

How can I help SQL Server recognize my view column is NOT NULL-able?

I have the following indexed view defined in SQL Server 2008 (you can download a working schema from gist for testing purposes): CREATE VIEW dbo.balances WITH SCHEMABINDING AS SELECT user_id ...
2
votes
2answers
520 views

MySQL Views Authorization

Questions: Is there a way, using SQL, to identify how many views are in the database per user? How can you authorize/deny users access to delete views created by another user?
7
votes
1answer
2k views

noexpand hint for non-enterpise edition and performance

I have to use Indexed views to reach performance. As I can see from this comparison table standard edition does not support indexed views. But BOL says: Indexed views can be created in any ...
6
votes
1answer
795 views

Materialized views in oracle

How are materialized views implemented in oracle? I've created a materialized view in oracle. What I now see is a quite normal table with a job. Are materialized views translated into tables & ...
5
votes
1answer
5k views

Will mysqldump command also backup all the views that are present in DB or there is a special command for it?

I am trying to backup my entire database along with the views. I am going to use mysqldump command. I was wondering if that will copy all the views or I will have to use separate command for it. ...
5
votes
1answer
355 views

Does sql server calculate views every time when someone query the views?

I wonder whether sql server calculate views every time when someone query the views. It is because everytime I query the views, it take such a long time. And when I tried to shorten the time by ...
3
votes
1answer
127 views

Do SQL Server Views update their data types automatically based on what tables feed them?

Someone mistakenly created a bunch of nchar fields in database tables. I noticed this, and after examining the issue, we're moving these fields to nvarchar types and trimming the values inside. In my ...
2
votes
1answer
269 views

How to pass a parameter into a function

At the moment I have a view created, see it here in the answer. How can I create a function on that cross tab, so I can pass a date, and get data for the specific date? Also is it a good practice to ...
2
votes
2answers
944 views

IN Clause causes Execution plan to change from Nested Loops to Hash Match

I'm tuning a query and have discovered some behaviour I'm not clear about. If I remove the WHERE IN clause the query runs in 3 seconds instead of 3 minutes. There only 7 rows returned in the ...
2
votes
2answers
3k views

How can I define the datatype of a view in MySQL?

I've written a simple aggregation view over a table, and the view returns different data types that the table. This causes some issues on the application side. Here's a simplified query for the sake ...
2
votes
2answers
470 views

What reason is there to create a physical table for a report output?

I've noticed that for Crystal Reports made by our organization and by some of our ERA software providers have a tendency to use physical tables for their reports' data sets, rather than using a view ...
1
vote
3answers
275 views

Selecting from a view shows the wrong set of columns

I'm selecting from a view in SQL Server. If I right-click on it and choose "Select Top n Rows", it runs and shows me 30 columns. If I open the view in ALTER mode (right-click, Script View As, ...
1
vote
1answer
4k views

Problem with View When Restoring a MySQL Backup

I have a database (InnoDB) with some tables, views and routines... Periodically I do a backup using the command line: mysqldump -u user -ppassword --routines db_name > backup.sql But I have a ...