Tagged Questions

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

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0
votes
2answers
31 views

A query for a latest version of data

MySQL. Let there is a table with fields startdate and kind. Actually in the real problem column named here startdate and kind are in a UNIQUE index, but the case if only startdate (not kind) is ...
4
votes
1answer
1k views

What is a partitioned view?

What is a partitioned view? I googled but could not get a satisfactory result.
1
vote
3answers
691 views

do MYSQL views occupy physical space?

do MYSQL views occupy physical space? Or in other words, is a MYSQL database limited to a certain number of views?
-1
votes
1answer
159 views

Odd syntax error when creating view with SCHEMABINDING [closed]

I've been working with SQL Views for a while now, and I recently read that something that I want to do requires that one of my views be created with schemabinding. That sounds fine, but I get a ...
-1
votes
1answer
613 views

How to create view in SQLite using INSERT INTO? [closed]

I'm trying to create view that will summarize data in two tables. Each table have several columns, but they both have NAME and AREA columns. And I want these two columns to be united correspondingly ...
1
vote
1answer
116 views

Does the SQL Server Backup Database Command also backup views from a Database?

I have a backup job (SQL Server Agent job) which will iterate through all of our SQL Server databases in SSMS, invoke the BACKUP DATABASE command to create a .bak file on a different server. This ...
1
vote
1answer
228 views

Can't query one view from another?

Okay, I'm moving a database from SQL Server (which I already miss) to MySql 5.6. I'm having a problem creating a list of valid dates. In SQL Server I just used CTEs to build up numbers, then months, ...
2
votes
2answers
78 views

View Disc Usage

Is this statement correct? Behind the scenes SQL Server actually stores the data in the view as a physical table which must be updated if any of the data behind the view changes I did some ...
2
votes
1answer
986 views

Can a view affect ALTER TABLE commands?

I provide a database system to a number of customers. The database is installed locally on Oracle. We periodically upgrade the database structure (either adding new fields, renaming old fields, ...
2
votes
1answer
515 views

Indexed view not being used - SQL Server [duplicate]

I've a query with multiple joins which takes long time to return data for one date. I've created an indexed view on the same. I set all the required options appropriately, while creating view and ...
4
votes
1answer
1k views

Join To a @Table Variable is running ineficiently

Alright so I have a report sproc that was running incredibly slow. Customers were complaining that the report would not run so I started investigating exactly where in the sproc the problem was and I ...
0
votes
1answer
37 views

Two dichotomy views of a table, and means to express this as a stored procudure?

There is a table events. Some relatively complex logic determines for each event whether it is archived. Then I need two more views: All archived events and all not archived events. How to express ...
1
vote
1answer
419 views

Question about Oracle's interpretation of “host cpu utilization” in v$sysmetric view

I am studying the v$sysmetric view from Oracle and trying to understand what is Oracle's interpretation of "Host CPU Utilization" It says in the metric_unit as % busy/(idle + busy), but what is busy? ...
0
votes
1answer
1k views

View dropped, now shows as table “in use”, can't drop

I have a view on a MySQL/MyISAM setup, then the underlying table had a column dropped, and made that view invalid. I tried dropping the view so I could recreate it, then MySQL said it was a table ...
1
vote
0answers
49 views

CouchDB views and references

Not sure if/how it is intended to be done but i am trying to match up all the active document in my database with the author of it: function(doc) { if (doc.data.active && doc.data.active ...
1
vote
1answer
92 views

Is it a best practice to contrast table and dependent view metadata to target which views to refresh?

We have non-indexed views created on vendor tables. When they change table structure or column definitions we run sp_refreshview as needed. What is the viability of a script to contrast the table ...
0
votes
1answer
242 views

Create a VIEW that spans 3 tables

Sorry if the title is not clear - feel free to improve. Here are 3 tables (not all data is relevant to the question): CREATE TABLE `content` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, ...
0
votes
2answers
792 views

MySQL Reusing calculation in SELECT clause in a VIEW

I have an SQL query that has a simple date difference between NOW() and the creation date (is in the table). I need to reuse this again within the SELECT clause in a VIEW. Is this possible at all? ...
4
votes
1answer
299 views

Adding indices to views

I have a table that contains XML data in a varchar type field. This field is used to store data from a variety of different XML schemas some of which are related via a record stored in another table. ...
5
votes
1answer
219 views

Are view references in a query properly called “derived tables” as such?

While answering a question on stackoverflow, I presented a definition of derived tables: A derived table is a complete query, inside of parentheses, that is used as if it were a real table. But ...
0
votes
1answer
73 views

Where can I read about views for MySQL?

I really don't know nothing about SQL.. I know how to insert and select data from database using PHP but besides that, nothing. I found this view And I am sure that 5 minutes for you to answer this ...
5
votes
2answers
803 views

Oracle View Ignoring External WHERE Clause

Good day, This one has me stumped. I have a rather nasty developer query that I would like to store in a non-materialized Oracle view. The text for the view itself is a bit long to list here, but ...
1
vote
1answer
187 views

What is the locking behavior for Updatable/Insertable Views?

Consider I have a View that is merely a simple join between 2 tables, selecting all columns. The View is Updatable and Insertable. What would be the locking behavior when executing an UPDATE or ...
2
votes
2answers
125 views

Migrating SQL Server 2000 to SQL Server 2008

I'm migrating SQL Server 2000 to SQL Server 2008. I have many views. How do I check each views that if they have an order by clause? Thanks.
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 ...
0
votes
1answer
50 views

viewing Original Object under synonyms

I have certain synonyms in my schema which represent views from another schema. Now in oracle sqldeveloper, I am unable to see the actual SQL for those views but I see only an SQL like: CREATE OR ...
0
votes
1answer
559 views

Retrieving a fixed range of rows from Postgresql

I have a query: select qid,ansid,ans from table1 where askerid='something' This query can retrieve many rows. But I want to display only 50 rows at a time and then if the user clicks on more, the ...
1
vote
2answers
2k views

SQL Server 2008R2 - How to prevent a role from creating or altering views within a database?

I have a situation on SQL Server 2008 R2 where I am trying to prevent users of an AD group from being able to create new views, or alter any existing views, within a particular database. This AD group ...
4
votes
1answer
854 views

Determining whether column in view can only contain unique values

I have a SQL Server 2008 database with several views. I'm looking for a way to definitively determine whether a particular view has a column that can only contain unique values (i.e. can be used as a ...
0
votes
2answers
66 views

View for a MANY_MANY_MANY relationship

Let's say I have 3 main tables: category, tag, url category and tag have a MANY_MANY relationship (category_tag). tag and url have a MANY_MANY relationship (url_tag). I would like for a given ...
15
votes
1answer
2k views

Execution plan shows expensive CONVERT_IMPLICIT operation. Can I fix this with indexing or do I need to change the table?

I have a really important, really slow view which includes some really ugly conditions like this in its where clause. I am also aware that the joins are gross and slow joins on varchar(13) instead of ...
2
votes
2answers
317 views

Does MySQL have information_schema.VIEW_COLUMN_USAGE or an equivalent?

SQL Server has a an information_schema view, 'VIEW_COLUMN_USAGE', which you can use to determine the actual/base tables that the columns in a view reside in. I'm looking for the equivalent in MySQL - ...
3
votes
1answer
3k views

Grant select to dbo view without select on non dbo tables

SQL Server 2008 R2 We have a login & user called "JoeBlogs", this user has it's own default schema of JoeBlogs - it has Public access only to the database. We then granted it SELECT on a dbo ...
1
vote
2answers
6k views

Why an object became invalid in oracle databse.

There are some invalid views and functions in my database. I am not sure what changes caused these objects to became invalid since many people are working on the same database. How can I see which ...
5
votes
2answers
12k 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 ...
2
votes
2answers
132 views

(MySQL) How to change the results of a view according to the user that's viewing it?

I have a table, named servers, with a single column id. This table is accessed by various machines each with a different username for the database. I want to make it so each server does not see all ...
2
votes
2answers
965 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 ...
3
votes
1answer
112 views

Slow MySQL query, not sure why

I'm working with an intranet application for property tax collection, and I've hit a snag. The following view runs much slower than I'd expect: create or replace view propertytaxessub0 as select ...
0
votes
1answer
385 views

Combining a tree structured Group model with its HABTM User model in one VIEW

I have a tree structured model Group which has the columns id, parent_id, name, lft and rght. I also have a model User which has the columns id, name and password. Group and User have a ...
4
votes
2answers
2k views

SQL Server Linked Server to Progress is slow with an openquery view

We have a SQL Server database setup with a Linked Server setup connecting to a Progress OpenEdge database. We created a SQL Server view (for using with SSRS) of some of the OpenEdge tables using code ...
4
votes
4answers
9k views

How to list all views in SQL in PostgreSQL?

How do I list all views for a database using an SQL command in PostgreSQL? I would like something similar to output of the psql \dv command, but preferably just a list of view names. e.g., SELECT ...
5
votes
2answers
1k views

Create index view with self join

I use SQL Server 2008 R2 and know that in Indexed View cant have self join. I have a tree table that have ID and ParentID Column and I need create indexed view on this table with self join between ...
-1
votes
1answer
219 views

Selecting just one table from Oracle view [closed]

I am creating a view to ease my manual selecting because I only want to fetch data from DB where it is meeting certain criteria which are present in several tables, so it is containing a lot of joins. ...
23
votes
4answers
9k views

Why not use a table instead of a materialized view?

I'm new to Oracle databases. If I have understood correctly, materialized view is a view which result set is saved as a physical table in the database and this view/table is refreshed bases on some ...
5
votes
3answers
774 views

Performance of Inline-TVF vs. Views

I have a database where i am using inline TVFs (table value functions) instead of views. For example, I might have two tables called [car model] and [car manufacturer] that I'm joining together ...
1
vote
1answer
203 views

What is a good way to query data stored in multiple identical tables split by date/time

I have a 3rd party piece of software which records data samples from industrial equipment. This data logging software stores data in sample data tables with approximately one day's worth of samples ...
1
vote
1answer
2k views

PostgreSQL 9.1 - Query on VIEWS taking a lot of time

Using PostgreSQL 9.1, we are having problems while executing queries on a VIEW of PostgreSQL. Following is the situation: We have a partitioned Table "buz_scdr" over which we have built a VIEW ...
9
votes
1answer
1k views

How do you represent VIEWS in an ERD?

Are VIEWS (CREATE VIEW) represented in an ERD? If so, how do you represent them and specify what tables they came from?
8
votes
3answers
2k views

Oracle: How do I query a Hierarchical table?

Background This is for the construction of some views we'll be using for reporting. I have an table of locations, the key fields being "location" and "parent". The structure that these two fields ...
3
votes
1answer
4k views

Oracle: How to create a not null column in a view

Given a table like: CREATE TABLE "MyTable" ( "MyColumn" NUMBER NOT NULL ); I want to create a view like: CREATE VIEW "MyView" AS SELECT CAST("MyColumn" AS BINARY_DOUBLE) AS "MyColumn" FROM ...