Questions tagged [view]

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

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2k views

Speed slow down on a UNION ALL view

This is my DB architecture: a 3.000.000 records product (memory) table that must be shared by all databases a x (say 1) records product table specific for each single database a view in each ...
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71 views

Possible SQLite bug?

I am running into an issue with SQLite that I think might be a bug. When I run the PRAGMA table_info command on a view that uses an aggregate function, the data type always comes up empty. To ...
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90 views

Time to generate execution plan for select into from a view takes significantly more time than select

I have a view, vw_example, that is quite complicated and has multiple joins across multiple databases. This view has been causing significant delays when used as part of other queries, and we've ...
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1answer
332 views

MySQL: Overlay modifications on original data while indexing on a field that itself has modifications

I have a MySQL table of original_data that is important for historical/auditing purposes and should not ever be changed. I want to be able to mark up these data with modifications, e.g. to correct ...
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112 views

View with where clause slower than query with same where clause

This query with periods (PeriodStart,PeriodEnd,ticker,FundamentalId,dimension) as (select b.reportdate PeriodStart, MIN(a.reportdate) PeriodEnd,b.ticker, b.FundamentalId,b.dimension from Base a ...
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1answer
7k views

Why create a Materialized View Log with Primary Key or RowID, etc?

I have a table with 600million rows. I want to create a materialized view that filters it down to 50 million records but also uses REFRESH FAST ON COMMIT. To use REFRESH FAST I need a MATERIALIZED ...
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134 views

Permissions on views/stored procedures and the referenced base tables in linked servers

I need help setting up security division between SELECTing and EXECUTEing from views and stored procedures and access to base tables referenced by those objects on linked servers on SQL Server 2012SP3....
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2k views

refresh a materialized view after update of tables

I am currently stuck in postgres at creating an updateable MATERIALIZED VIEW. The MATERIALIZED VIEW consists basically from 2 (foreign) tables. This is an example for the tables: id | data ---+----...
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275 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 of ...
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1k views

force SQLite view column type affinity

Using SQLite 3, I have some view columns which are defined with an expression, and so have no type affinity. Is it possible to define them in a way that forces them to have a certain type affinity? ...
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1k views

How to improve performance when joining against coalesce

In an effort to remove a caching layer from our application, I'm building a number of views to encapsulate the different ways a user can have access to a piece of content - one per "rule" of access. ...
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324 views

Identity in a view treated as ordinary int - migrating from SQL Server 2000 to 2012

I'm migrating a very old platform from a SQL Server 2000 backend and MS Access 2003 as its frontend to SQL Server 2012 backend and MS Access 2010 as the frontend. This obviously means a bit of ...
2
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1answer
265 views

Tools and techniques for untangling monster views (nested views)

First a bit of context (venting). I'm working with a new vendor product which is really nothing more than a SQL Server database with a .NET interface. First few weeks with this client and users are ...
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79 views

Setting up triggers based on exposed columns in a view's source table

I have a table where I want to do a AFTER UPDATE trigger if one of the columns modified was in a specific view CREATE VIEW [dbo].[iv_EmployeesView] AS SELECT EMPLOYEE_GUID AS EmployeeGuid, ...
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68 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 =...
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34 views

MS SQL Server Enterprise 2016 is truncating the audited select statements, how do we fix it?

TL;DR; I am getting SELECT as the audit output instead of the actual (suspected) query SELECT DISTINCT CONVERT(varchar, DecryptByPassphrase(getkey(N'key1'), FIELD1)) as DECRYPTED_FIELD1 FROM view1 ...
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35 views

How to optimize MySQL VIEW performance?

All my years of development an this is my first post, so I hope I get this right. I hoping someone can help, my SQL skill is sufficient enough to get me by most of the time, but I'm having poor ...
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2answers
28 views

Why MySQL doesn't use indexes in view with union select?

I've created a view: create view dh_hits_new_all_old as select * from dh_hits_new_201806 union all select * from dh_hits_new_201807; When I select something with a where clause containing a field ...
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1answer
40 views

PostgreSQL - trying to speed up query responses from view that has join and group by

I have these two tables: precipitaion: store precipitation data at daily (freq = 'daily') and hourly (freq = 'hourly') frequencies for 7 months so far (I receive regular updates). Column | ...
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1answer
36 views

Insert into indexed view?

I give an example to show my problem. I create 2 table as the following: CREATE TABLE a ( id INT ) CREATE TABLE b ( name NVARCHAR(10), id INT ) Then insert data into these tables ...
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1answer
40 views

Only join to latest entry in subselect in a given range determined by the main select

I have one table Haul and one table ChargeCarrier_Storage. The latter contains movements of charge carriers between storage locations. Haul has an arrival and a departure time. I want to join together ...
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1answer
593 views

MYSQL - How to optimize VIEW performance?

Total profiles - 100000 Each profile is connected to one or more platform Each profile have 50 Tags Each profile have 4 themes I have a user view (total users around 100000) where I am joining all ...
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1answer
60 views

Creating a view that calculates percentages

I have this table getting populated with top10 destination ports every ten minutes along with a "total" entry that records the total number of bytes and packets transmitted for each port for the time ...
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1answer
39 views

SQL Find Code for Each Separate Column in View

We have a SQL View, trying to find the calculation/business logic for each column into a select or table. create dbo.CustomerVw as FirstName + ' ' LastName as FullName datediff(yy,BirthDate,...
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107 views

explain on view shows derived while explain on select shows simple select type

I have a view v which involves a couple of sub-selects in its SELECT clause plus a couple of joins by id or indexed column. The view query is like: SELECT col1, col2, (SELECT ... FROM subt) AS col3 ...
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36 views

How to aggregate transactions to form a stateful view which can be updated efficiently?

How to aggregate transactions to form a stateful view which can be updated efficiently? For example how to turn the following transactions: CREATE TABLE txns_combined(from_party,to_party,price,qty,...
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60 views

Combining two event tables into one postgres view

I have two tables, events and event_logs. The events table stores the theoretical data on a recurring event whereas the event_log stores specific information on a particular datetime. Event +-----...
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1answer
5k views

MySQL having variable in view

I have a query that I want to save as a view because it will be used on a different system that we don't have access to. The query basically gets running balances on debit and credit columns from a ...
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2answers
993 views

Use Stored Procedure or View to return Data from Multiple Tables

Is it just down to preference for whether to use a View or a stored procedure (or TVF) to simply return data joined from multiple base tables? Is there any best practice regarding this? Should a ...
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0answers
40 views

View loophole to DENY Select

I am attempting to deny a certain schema from a particular User Group. To do this I used the statement "DENY SELECT ON SCHEMA" statement and it was successful in denying access to the tables with ...
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0answers
111 views

Invalid views not showing in user_dependencies after first compilation

When I create an (invalid) view that selects from another invalid view, the view does not immediately show up in user_dependencies. I am wondering if this is expected. These are the steps to ...
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36 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 ...
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1answer
371 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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145 views

SQL query causes server gone away

I'm developing a database system which stores and caluclates engine performance data. I have been created a new view which selects data from several tables and calculates some values. Now I'm running ...
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166 views

Secure view on row level with custom security tables

Let's say I have a following table that lists all member of my application. CREATE TABLE dbo.Member ( MemberId BIGINT, LoginName NVARCHAR(64), SecurityRole NVARCHAR(64) ) I assume that ...
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2answers
1k views

Mysql: Create a view with multiple self joins without duplicates in result

Just to clarify i can't change the tables structure, so please leave out the "you should change your tables to this and that" answers, thank you. So i have a table entities_attributes_values where an ...
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0answers
107 views

MYSQL — Inventory View with calculated fields

Trying To create an inventory view. I have created this query using MS Access query builder since I am no pro at SQL and this is pretty convoluted. When translating this into MYSQL syntax I get an ...
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1answer
193 views

Insufficient privilege

We are using oracle 11g I am replicating production db for dev environment. I Have a user named CST2 and CST0 where CST0 contains all tables and view and public synonyms for the same. I have provided ...
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2answers
64 views

Schema/Structure to handle secondary computed data

I'm trying to design a LAMP-based website for my pinball league, which plays competitive pinball every week in match play. One of the features of our league is that we convert raw scores to ...
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1answer
2k views

MySQL - Problems caused by SQL Security definer or invoker

I have a view used to be defined as: > **CREATE > ALGORITHM = UNDEFINED > DEFINER = `user1`@`localhost` > SQL SECURITY DEFINER VIEW `schema1`.`view1` AS > select &...
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6k views

How can I create a view in a stored procedure on MySQL?

I am trying to dynamically create views based on an SQL query and have a trigger recreate them when the fields in the view are to change. When I call the procedure I end up with a permission denied ...
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1answer
703 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 ...
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12 views

Does MySQL have a built-in way to tell whether a view is insertable (not just updatable)? E.g., something like the IS_UPDATABLE flag, but for INSERT?

The MySQL documentation for the INFORMATION_SCHEMA.VIEWS table mentions that MySQL sets a flag whenever a view is created that records whether that view is updatable, i.e., whether you can UPDATE the ...
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113 views

Data mismatch in View2 [SELECT * from View1] with View1, how to fix?

The problem I encounter can be oversimplied as CREATE View#2 AS SELECT * FROM View#1; SELECT * FROM View#2; SELECT * FROM View#1; Then View#1 and View#2 return different results. This challenges ...
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1answer
18 views

Collation conflicts between views and functions when using utf8mb4_unicode_ci collation

Currently running MariaDB 10.3.24 and I really want to fully support the utf8mb4 unicode character set in my databases. The problem I am running into is that when I try and set everything up to use ...
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0answers
48 views

Error when creating view, but everything after SELECT works

If I just run the SELECT statement all the way to the end, it selects what I want. But if I try to make a view it says CREATE OR REPLACE VIEW not_entered_purified AS SELECT * FROM ...
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41 views

Why is my view selecting hundreds of duplicates?

This view selects 696 entries. The CSV file has 48 entries. CREATE OR REPLACE VIEW insert_3_char_abts AS SELECT ext.construct_id, n_term, enz_name, c_term, cpp, mutations, ...
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24 views

Oracle 12cR2 - ORA-00905 When Creating View

I want to create a view as below: CREATE OR REPLACE VIEW "USERNAME"."VIEWNAME" ("columnName", "columnName", "columnName", ...) AS SELECT DISTINCT ...
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1answer
42 views

Oracle 12cR2 - How To Create DDL Script Of A View With All Dependencies and Permissions

I have a view in my production database and I want to create same view in my test database. I tried this commmand: ‌‌select dbms_metadata.get_ddl('VIEW','VIEW_NAME','VIEW_OWNER') from dual; It ...
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22 views

How to redefine the SQL of a postgresql view without invalidating the programs using it

I have a complex piece of code that performs a FIFO allocation. i need this logic in 3+ different places in my application to link 3 different sets of tables together. in MSACCESS, i can accomplish ...