Questions tagged [view]

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

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37 views

how to view data as history of field value change

Example i have data like id employeeId Salary Year 1 1 12000 2001 1 2 10000 2001 1 1 16000 2002 1 3 12000 2004 1 ...
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1answer
82 views

Querying 500 million records in Oracle view takes forever

I really need professionals help now after wasting a week of time to solve my problem and searching on Stack Overflow. I have a view created on top of two different tables. This view has 500 million ...
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2answers
285 views

Why is the result of a totally deterministic and all-encompassing “case” in select query in view nullable?

I have a table, with Id as the primary key. create table Anything ( Id bigint not null primary key identity(1, 1) ) When I look at this table in Object Explorer, I see this image of course: As ...
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1answer
42 views

Are there any unforseen down sides to using views to abstract away from cryptic table names?

We have to report against a very large and complex vendors HR/Payroll database which has cryptic table names such as A100M, C755V, X50AA etc. In order to make writing queries more human friendly, I ...
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1answer
75 views

What is the rationale of dropping all indexes for an altered view in SQL Server?

This is a follow up of ALTER VIEW drops Index from View question. The accepted response indicates that ALTER VIEW will automatically drop any defined indexes. This is somewhat counter intuitive to ...
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2answers
641 views

ALTER VIEW drops Index from View

as the header line suggests: Using an ALTER VIEW statement on a VIEW that has an index on it will drop this (all?) indexes from the VIEW without warning. I would prefer the ALTER VIEW statement to ...
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1answer
88 views

Select * from View is taking a SUPER long time [closed]

I have created a view which gets data from 5 tables, 3 of them containing 200k+ rows,340k+ rows and 2.1mill+ rows. The view contains group by clause, case statements and CTEs. When I do a simple ...
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1answer
76 views

Create a view with distributed Lobs

I have two Oracle 18c instances (instance 1 with schema DB1 and instance 2 with schema DB2) and I know that there ist a support for distributed lobs since 12.2. So i did the following: CREATE TABLE ...
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1answer
34 views

How can I select non null columns from a view of EAV tables

I have a VIEW that queries my E-A-V model which uses datatype tables to store the values. I have an entity that contains many attributes, each attribute can be a different datatype. The DataType ...
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1answer
58 views

Modelling a user-defined filter set in SQL

In my database I have a table containing data that I need to filter. The exact contents of this table aren't important so I'll just call it data. Now, my users also need to be able to create filter ...
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1answer
1k views

Postgres: How can I force index usage for view with latest rates?

We import currency rates into DB: CREATE TABLE currency_rate ( id int8 NOT NULL, date date NOT NULL, currency varchar(3) NOT NULL, rate numeric(12,6) NOT NULL, CONSTRAINT ...
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1answer
47 views

Sql Server view with very limited access

I have a requirement to limit a view in Sql Server 2008 R2 that user: user has access to select from view. user has not access to copy the result from select statement. user has not access to join ...
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1answer
36 views

Order database view in new columns

I've created a view from a table in SQL Server which cannot be altered in any way. The purpose is to make the fairly complex table conceivable for the users. The view consists of several columns ...
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1answer
28 views

Optimizing the repeated use of the same if condition inside a VIEW?

CREATE OR REPLACE VIEW VIEW_NAME AS ( SELECT table0.fieldBlah "FieldBlah", --more fields IF(table1.foo or table2.foo IN ('State1', 'State2'), 0, table3.uniqueField) "uniqueFieldName") ...
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4answers
3k views

Does SQL Server Only Perform Calculations In A SELECT List Once?

Take the following example: SELECT <CalculationA> As ColA, <CalculationB> As ColB, <CalculationA> + <CalculationB> As ColC FROM TableA Would CalculationA and ...
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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
590 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
48 views

Get notification about invalid views

I have 40 views that are integrated/synced to a work order management system on a weekly basis. The views are based on GIS tables which are notoriously messy. Over time, the views can end up becoming ...
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0answers
121 views

ORACLE MULTIPLE TABLE INDEXES ON GROUP BY

I have a VIEW with multiple tables, it has a group by statement containing multiple columns from each table. The problem is access to the view takes 4,5 seconds and ideally should take less than 1. ...
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1answer
54 views

SQL SERVER: Find and Drop Invalid View

I have a SQL Server 2012 database which contains a number of views which have become invalid. The underlying tables the views referenced were migrated to another schema for archiving. What's the best ...
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3answers
2k views

Manipulating a Column Containing Key/Value Pairs

I'm accessing and creating reports from a vendor via a replicated SQL Server database. They've done some absolutely insane things that I've been trying to solve for, but this one takes the cake. ...
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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
51 views

split big table into two joined view

i have a big postgres db with single table for product and attribute but i want two view of one with product and one with attribute. for example now i have tb_products iditem | name | attributes ---...
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1answer
39 views

Creating a view (or table) from JSON data with two different shapes

I'm pulling in JSON data from two different sources that have roughly the same information, but in different shapes. Let's say I'm pulling in data about music albums, and one of the API responses ...
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2answers
50 views

Improving the queries in a view to query custom types

I'll spare you the details, but I've got a situation where I'm going to be creating and managing a lot of custom types. (Postgres 11.4, ultimate deployment under RDS.) It looks like there isn't a ...
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1answer
65 views

How to create a VIEW when Table1 is having relation to Table2 on several of it's fields?

My situation (greatly simplified) is as follows: Table1 ID Name Ver1 Ver2 Ver3 Ver4 Table2 ID Name ... This table holds the versions The columns Ver1 - Ver4 are foreign keys and are IDs of ...
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1answer
66 views

Optimize a postgresql database view query

Given the following database schema (using rails-like associations, as this is a ruby-on-rails project, also please forgive me for how I phrase this for I am new to this forum): Client has_many Deals ...
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1answer
1k views

Entity Framework 6: How can I add new column to existing table and at the same time update view (add column) in same migration file [closed]

Example in the EF6 migration file Up method. I wish to add a new column B in existing table Country. Sql("ALTER TABLE [dbo].[Country] ADD [B] INT DEFAULT((0)) NOT NULL;") Then I will need to ...
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1answer
31 views

SQL Server 2016 - Disparity Between View Definition and View Design

I've run into an interesting issue with some databases I've inherited, and could use some help unpacking it all. The Issue After adding a column to a table, views selecting * from that table are now ...
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3answers
966 views

How do I query for system views in a SQL Server database?

I have some queries that run against Query Store, the view sys.query_store_wait_stats is not in SQL Server 2016, but it is in SQL Server 2017. I want my queries to work in SQL Server 2016 and SQL ...
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0answers
33 views

How to count two columns per month per country in MYSQL View

I am trying to modify a view that has been created for my mysql database. I would like to count the total of subscribers and subscribers per month per country. currently the view that I have (see ...
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0answers
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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2answers
248 views

How to avoid conditional join in order to write a tsql view

I have a scenario where I have Roles, Set, DefaultSet, and CompanySet tables Roles table RoleName --------- Admin Viewer User Set table Id Name --- ---- 1 Employee Data 2 Help ...
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37 views

MySQL view extremely slow despite indexes

I'm having an issue with a view, when I make a query it brings CPU to 100% and it keeps loading. The view is: https://pastebin.com/ZgB7rr91 channel_data_60 table contains about 1,200,000 records: ...
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1answer
155 views

Dropping a table/column automatically drops views using it - how to warn instead?

If I have a view that uses a column, and I remove that column/table, the view is dropped automatically. Is there a setting I can change such that it instead prevents the removal of the column/table, ...
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0answers
47 views

How to formulate a query and view for the following structure?

Consider the following table structure: TableA ColumnA ColumnB ColumnC Ro1 A 1 Ro1 A 1 Ro7 A 3 Ro2 C 1 Ro3 B 1 Ro3 B 1 ...
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68 views

Allocating Rows From One Table to Available Date Range in Second Table

I designed a Shop Floor Scheduling System and it’s been running well for years, but the managers are now asking for something more precise and what they are asking for puts me outside my comfort zone. ...
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2answers
509 views

Will Postgres perform the computation of calculated columns that aren't selected in a view?

I'm trying to understand the performance impact of selecting data from a view, where one of the columns in a view is function of other data in the original table. Does the computation get performed ...
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0answers
49 views

Postgresql: how to create a View combining regular Tables A, B, C and pivoted table D with a json field?

I have created a standard view, VIEW, that includes different fields from different tables: SELECT e.id AS "Employee Id", concat(e.first_name,' ',e.additional_family_name,' ',e.family_name) AS "...
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1answer
172 views

Database VIEW with a dynamically changing filter

I am trying to create a view based on a specific case. Following is my table: Table Name: Calls CustomerName | CallID | Timestamp | Quality | PacketLoss | Jitter The goal is to create a view that ...
2
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2answers
3k views

SQL script to count rows for all views in a database with SELECT-only access

I need to know the row count for every view in a third-party database that I have been given SELECT-only access to. The following script works for tables but not views: SELECT SCHEMA_NAME(A....
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2answers
1k views

MySQL Create View WITH CTE

I have successfully created a VIEW in SQL Server as follows. But when I try the same in MySql, Error coming. SQL SERVER Command: CREATE VIEW [dbo].[vw_PurchParent] as WITH cte AS ( SELECT a._Id,...
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0answers
50 views

Reconciling AR Payments against invoices

I have a situation I have been working on for quite some time. We sometimes give our customers extended terms and allow them to make payments toward a larger invoice. Those payments are expressed with ...
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2answers
255 views

How to get SEEK accessing converted ID via view

Assume I have a table: -- just for test purposes CREATE TABLE SomeTable ( ID INT IDENTITY(1,1) NOT NULL CONSTRAINT PK__SomeTable__ID PRIMARY KEY CLUSTERED ,SomeColumn1 NVARCHAR(50) NULL ,...
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3answers
10k views

How to copy data into same table based on existing data in sql?

It is possible to copy a set of rows based on Date column and insert in same table with different date? For example : I have 5 rows with Date column value '201839' I need to copy those 5 rows in '...
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0answers
61 views

Create indexed view with fluctuating data behind

I´ve heard about indexed-views in MSSQL which can increase the performance. My problem is that I want to create a view which joins round about 5 tables. The tables are constantly updated and are ...
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2answers
68 views

Resetting a new archiving database

I have an archiving question. We have a History DB used for archiving old records from our main system and the application knows to query it However, it becomes too big. I would like to ...
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1answer
477 views

SQL Create Script DDL Table from View

How do I script a Create Table DDL for a View? Example View: create view dbo.CustomerTransaction as select cust.CustomerId, -- this is int cust.CustomerName, -- varchar(25) tr....
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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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1answer
21 views

using view (necessary) with where conditions (dynamically)

Suppose we have two tables like A {a1, a2, a3 ...} and B{b1, b2, b3 ...} We are using a MySQl view like Select a.a1, b.b1 from A a Left JOIN B b ON a.a2=b.b2 Now our requirement is that we have ...

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