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

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18 views

How to generate list of dates — ie every day for the past 2 years? (sql server)

We're using a business intelligence system and need to load a list of dates so we can flag them as 'last week' or 'last 12 months' or some dynamic value. I'm wondering what's the simplest way to ...
4
votes
1answer
30 views

Function that returns table with an additional column

I want to write a PostgreSQL function that returns a table, plus an additional column. Is there a way to do this without manually specifying RETURNS TABLE (col1 type, col2 type, ...)? For example, ...
1
vote
1answer
23 views

Getting Error : [Err] 1615 - Prepared statement needs to be re-prepared with MySQL 5.6.30

Problem/Issue : Getting Error : [Err] 1615 - Prepared statement needs to be re-prepared I have a Stored Procedure which contains a Prepared Statement and a view DROP PROCEDURE IF EXISTS `sampleProc`...
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42 views

Selecting a View consumes 4GB memory but executing SQL statement of View only 70 MB

I am facing high memory consumption on my database server. During diagnosis, I found a view consuming 4 GB memory. But when I executed it's statement (select statement of view) it's taking only 70 MB. ...
0
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1answer
15 views

How can I create a view with self referencing table and a cyclic condition?

I have a self-referencing table. ID BIGINT NOT NULL PRIMAY KEY, DELETED TIMESTAMP NULL, PARENT_ID FK How can I create a view of this table which each row's DELETED is NULL and any of its parent's ...
3
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2answers
78 views

If view A is built atop other views and tables, does a user need permission to only view A, or everything down?

I'm talking about SQL Server in particular. I suppose a user tried it and got an error (you don't have select permissions on hidden underlying view B not explicitly mentioned in query). The main view ...
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0answers
27 views

View NULLABLE Column Issue

I have a View that contains a column from a base table. The column is set to NOT NULL in the base table. However, in the view it is set as NULL. Even if I mouse over the CREATE VIEW script it shows ...
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29 views

Stored procedure generating dynamic SQL is slow for some paramaeters

I'm having issue with a stored procedure that generates dynamic SQL, it performs ok for some parameters but very slow for some parameters. This has been an issue everyday and we are making some ...
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1answer
82 views

Select query with views crashes with ORA-03113: end-of-file on communication channel

I've installed an application developed on 11g XE in a 11g Enterprise Edition server (Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production) and main SELECT query triggers this: ...
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1answer
50 views

View created using Join Queries taking too much to load

I have written a query to create a view which i can use as a flat table in my application, which is having more than 30 inner join conditions across 25 tables. Now the problem is every time i am ...
0
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1answer
50 views

SQL Server : View names

I'm coming from an Oracle background and came across code to create a SQL Server view which I've never seen before. We have a view called viewA (for example) Within the script to generate the view I ...
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1answer
16 views

Forcing uncommitted read access via view?

I have an application (which I'm only the user of, i.e. I cannot change it, but I do have control over the database) that performs relatively simple, but potentially very frequent concurrent look-ups ...
2
votes
1answer
60 views

Bulk Insert into view and find missing values

I have 2 tables, Categories, and SubCategories: CREATE TABLE [dbo].[tbCategories] ( [CategoryID] [int] IDENTITY(1,1) NOT NULL, [CategoryName] [varchar](250) NULL, ) CREATE TABLE [dbo].[...
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0answers
22 views

Views dependent on other views [duplicate]

Is it bad practice to have views dependent on other views? If one dependency doesn't affect performance, at what level of dependency will it start showing negative effects? In the picture is an ...
2
votes
1answer
25 views

Limited utility in RECURSIVE VIEWS?

In the docs for recursive queries with WITH, you'll find this Recursive queries are typically used to deal with hierarchical or tree-structured data. This seems to be true, but how does this ...
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1answer
64 views

Does schema binding views affect performance?

Does schemabinding views affect performance in SQL Server or is just to prevent accidental changes?
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2answers
37 views

Create view with group by and extra fields

I had a hard time putting the question title together but essentially I want to create a view like this: ALTER VIEW vPlaceStatistics AS SELECT COUNT (TypeID) as Count, TypeID FROM PlaceStatistics ...
6
votes
1answer
58 views

Does issuing DDL against a view in PostgreSQL take out the same locks as issuing DDL against a table?

I understand that views are implemented using the rule system but I'm unclear if this has any advantages/disadvantages when running transactional DDL against them. Does issuing CREATE OR REPLACE VIEW ....
2
votes
2answers
79 views

Filtering UNION ALL result is much slower than filtering each subquery

(edit: see end for a simpler example) I'm searching in a table named "cases" (135k rows, 29 columns). Some of the rows in this table have a type of parent-child relationship (of different types), ...
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2answers
22 views

How to grant permissions to users based on table information?

Say I have a table: +------------------------+ | Employees | +------+--------+--------+ | Dept | Name | Salary | +------+--------+--------+ | 1 | John | 10000 | | 1 | Mary | ...
0
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1answer
31 views

Replicate View different servers

Using MySQL, and related to this answer open in another thread (How to replicate MySQL table in different servers?), It arises me the idea of replicating only a View in different servers (through ...
8
votes
3answers
167 views

How to improve estimate of 1 row in a View constrained by DateAdd() against an index

Using Microsoft SQL Server 2012 (SP3) (KB3072779) - 11.0.6020.0 (X64). Given a table and index: create table [User].[Session] ( SessionId int identity(1, 1) not null primary key CreatedUtc ...
2
votes
2answers
72 views

Why am I able to query for more than 1024 columns but I can not make a view of the same query?

My boss is requesting a view with greater than 1024 columns where in he will only select a few columns he wants when he queries the view so that the actual returned columns are less than 1024. Why am ...
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0answers
23 views

Efficient Provision of Multiple Versions of Data

We have a fairly unusual database use case: we have a number of large datasets used for research (the largest being a couple of billion rows). The datasets are used by potentially several hundred ...
0
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1answer
34 views

Is the same thing(internally) putting conditions in a query over a view that directly on the view?

I'm having trouble understanding performance with queries on views. Given this two scenarios, the queries internally will be the same? SCENARIO 1 View: CREATE VIEW TEST.SIMPLEVIEW AS SELECT ...
2
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1answer
58 views

Create a table based on a table depending on the values in the initial table column

I have a table like: +----+--------+----------------+ | id | name | address | +----+--------+----------------+ | 1 | Ivan | Moscow,Moscow | | 2 | Petr | Samara,Samara | | 3 | Grigor ...
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1answer
48 views

Creating a view with a Left Outer Join and Where Condition

Let's say I have a User Table and a User Record table which lists Data Sources associated with that User. I want to create a (Sql Server) View that lists all the contents of a User, and an optional ...
1
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1answer
46 views

special setup to create views in Oracle in default schema

When creating views in Oracle, do you need special setup for a given user if the view and table in which the view is reading from are in two different schemas? The user creating the view has dba ...
0
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1answer
88 views

Encapsulate table with view

I need to change the order of columns in my table (Oracle and SQL Server). Reason is that some of our software calls select * and insert without specifying columns. Refactoring will be too expensive ...
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1answer
46 views

Create a temp table that consolidates start and end dates plus generates a uniqueid for each consolidated record

Hey Microsoft SQL Gurus I need your help, please. This is my first post, and I have a table called projecthistory, it’s actually a view so I could take advantage of the Rank()function to get a unique ...
0
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1answer
23 views

Can there be situations where using (noexpand) on an indexed view is undesirable?

From the past experience using the schema bound and indexed view in a query with (noexpand) hint usually dramatically improves performance if the view is designed well. Apparently using the indexed ...
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2answers
37 views

Database view listing distinct days

I have a list of sensors of many machines, that stores on a second base (i.e., 86400 records each day for each machine). One of the many columns is the datetime of the value (that can also be stored ...
3
votes
1answer
35 views

Select Permissions Multiple Schema

I have an interesting one that I have not had the pleasure of solving before. I have been asked by a client to implement some views for reporting purposes, the views will be accessed via PowerBI, ...
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1answer
34 views

Is it possible to write a select * view that includes new columns added to table?

I would like to write a view that is essentially something simple select a + b, * from table_name and will always truly include all columns in table_name, even when I add or remove them. If I do the ...
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0answers
58 views

Get the name of the table column referenced by a (auto updatable) view column (PostgreSQL)

Given the folowing view definition create or replace view projects as select id, client_id as clientId from data.projects Is it possible, knowing the view name and the view column to get the name ...
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64 views

Can't create a view for other user's table despite having select privilege

I already executed the following commands: grant create view to scott; conn hr/hr; grant select on employees to scott; but: create or replace view company_phone_book as select employee_id emp_id, ...
0
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1answer
20 views

Hide column values for some rows in auto-updatable views while retaining the “write” capability for them in PostgreSQL

Suppose i have a view defined like this create or replace view clients as select id, name, case app_user_type() -- hide column content for everyone except the administrator when ...
8
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0answers
158 views

SQL Server - Handling localization of strings in nested non-deterministic view stacks

While profiling a database I came across a view that is referencing some non-deterministic functions that get accessed 1000-2500 times per minute for each connection in this application's pool. A ...
0
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1answer
34 views

Partitioned view with dedicated “routing” column

I have an application (Microsoft Dynamics NAV to be exact) that splits up data for different companies in tables with the exact same structure. I can not change that behavior, so I built VIEWs that ...
2
votes
2answers
33 views

Most restricting permissions for querying view with linked server

I've created view to query another server via linked server(SQL Server 2014). I need to grant permissions to developers to use this view. Granting only select is not enough and they got the ...
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2answers
40 views

Correct way to write this view? Total sales/purchases/profits by day

I'm currently trying to create a view that lists a sum of sales, purchases and profits done by each person per day. This data comes from 3 tables: transaction: idtransaction (pk) user_iduser (fk) ...
1
vote
1answer
96 views

Postgres CTE query for a single row not optimized

From my database I am trying to get a weighted sum of a user's stats, and I will only be querying the table one or two users at a time, so I wrote it as a view. Since it's a view, I pretend to ...
6
votes
3answers
318 views

Updating a view on multiple joined tables

Since MSDN does not say much, what happens exactly if I execute the following query? update claims set status='Awaiting Auth.' where status = 'Approved' Can I use the ClaimStatusName column of the ...
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vote
1answer
33 views

DB2 - cannot invalidate a view

I work on something and I need to check some views. I use this code: SELECT SUBSTR(T.TABNAME,1,32) AS TABLE, SUBSTR(T.TABSCHEMA,1,32) AS SCHEMA, T.STATUS, T.TYPE FROM SYSCAT.TABLES T WHERE T.TABNAME ...
1
vote
1answer
71 views

Making data fetching faster on VIEW

I have created a rest service which fetches data from Oracle database and send it back to the application from which the rest service is called . Below is the query to fetch data from VIEW ,this ...
0
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1answer
43 views

Cast as INT(11) instead of DECIMAL 11,0 in a view

I have a view with a column defined as: IFNULL(priority.id, 2) priority_id, ... where priority.id has type INT(11), however the resulting view column has type: DECIMAL(11,0) How do I get the ...
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1answer
34 views

Find insert/update/delete queries that reference a partitioned view

I have just given a SQL Server with performance problems. The database is very large and use distributed views with a very large primary clustered key. (24 bytes). I would like to change this primary ...
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1answer
49 views

Performance issue using view vs. direct statement

I have a table with structure similar to this: table values ( id1 int, id2 int, value real, value_at timestamp, constraint primary key (id1,id2,value_at) ) I need to get the "current value" for a ...
1
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2answers
358 views

Complex view becomes slow when adding ORDER BY in outer query with small LIMIT [closed]

I have a pretty large query in a view (let's call it a_sql), that is really fast unless I use ORDER BY in an outer SELECT with a small LIMIT: SELECT customs.id AS custom_id, customs.custom_name AS ...
2
votes
1answer
30 views

Turn off auto qualification of table names when creating a view

Problem Definition I am trying to modified a shared development database, for a dev team to use for application development/testing. Most of the collective work (table names, views, etc) are stored ...