Questions tagged [eav]

Entity-Attribute-Value. A data model with a potentially big number of attributes of which only few apply to a single entity.

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Is it good to join on different tables depending on discrimination column?

I want to build a MySQL database with different trading card, all belonging to different games. Each card, depending on the game, has several properties. For example : A Magic: The Gathering card has ...
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Converting EAVT table into SCD type 2

After a lot of research and head picking, I'm still unable to find a good/clean solution to convert an entity-attribute-value-timestamp table to an scd type 2 dimension. Here's the issue: I have a CRM ...
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Kinda EAV in SQL Server

So i need to build at database where the admin user can add and remove models without me. Instead of the normal type with all the values in one big table and them all with varchar type, I was thinking ...
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Model types of an entity [duplicate]

Let's take a simple users table. I have a few different type of users. Let's simplify it into two, employees and customers, for the sake of the example, but keep in mind I do have much more. So I have ...
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Large join on multiple indexed tables fails on copy of the schema but not on another

We have two schemas, both from the same template and with near identical record count (less than 100). They are both running in the same MariaDB 5.5.68. We also have existing schemas that run this ...
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INSERT or UPDATE the values from a table A into the columns of table B based on table A's value in its row?

I have a table which contains attribute names with there values but each row is a attribute with its value, ItemId ItemAttributeName ItemAtributeValue 405 Application High AmpacityConnections 405 ...
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Flatten multiple rows from One to Many to single row

This questions is similar to what I need but the answer seems rather specific to the question rather than a general answer. One to many relationship query result in a single row and dynamic multiple ...
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Need help designing database, Create a table with additional columns/fields in the table, or create a new table for each different type?

So the tables that I have are Certificates, Approvers, CertificatesApprovers, Categories, Approvees, Status, AdditionalFields, AdditionalFieldsValues. Many Certificates to Many Approvers relationship. ...
2 votes
3 answers
2k views

How to store multiple data types for same column (for many columns)

To preface, similar questions have been asked, but I have not found any that address a table that has a large number of columns affected by this issue. All the similar seem to address a table that ...
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EAV - COUNT()/SUM() on column and row values with and without NULLs

Assume that there is a table demo with these data: id userID title data 1 1 DATE 01-01-2021 2 1 COLOR RED 3 2 DATE 4 2 COLOR YELLOW 5 3 DATE 04-01-2021 6 3 COLOR RED 5 4 DATE 04-01-2021 6 4 ...
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Does PostgreSQL support wildcard indexes on JSON?

I have a multi-tenant service with a table like this: project_id | user_id | user_properties Each project belongs to a different customer and customers can freely attach metadata to their users. A ...
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2 answers
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Dynamic pivot table filtering and performance

I have these tables and I'm trying to rotate the subscriber to column table to horizontal and filter its result based on multiple and/or conditions like the following: WHERE first_name LIKE 'm%' AND ...
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MySQL Best approach for recording last update timestamp for every column and every row

This question is about possible approaches for time stamping every column of every row in a table. I have a table with a small number of rows (fewer than 200 and not likely to grow much larger). Each ...
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Optimal mySQL design for 500k+ products with up to 50 specs

I facing a problem where I have to design a MySQL database capable of containing +500k products in approx. 1.500 categories, that can hold up to 50 specs. (like size, weight, speed, color, etc). My ...
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Eav model sql select only products with all 3 values?

I have an EAV (Entity Attribute Value) based table for smartphones like the following: What if the user wants to see all phones with - red color - steel material The query is like: WHERE (...
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EAV, multiple left join query optimisation

Any assitance would be greatly welcomed. Pardon my ignorance however I am wondering if anyone else has had to encounter bad EAV performance issues. I have a particular query which takes a long time. ...
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optimizer uses all the wrong indexes instead of one right

This is another stupid question about optimizer. Synopsis is exactly as the subject is: the optimizer does it wrong. Seems like is has an absolute desire to use any index that contains REALM_ID field: ...
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Alternatives to EAV model

I am looking for a design pattern that would allow me to capture metadata relating to columns on a table. More specifically, here is my situation. I have a database with fields in a field table, ...
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Is it practical to use entity-attribute-value (EAV) model to support custom user fields and avoid bloating of tables?

I am currently working on a medium-sized web app project that is already in production using Laravel framework and MySQL 5.6.40. My clients have been asking for the ability to add additional ...
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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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E-A-V entity Attribute Value Generic Model with Min Max Values

I have an entity consisting of several attributes (can be added, can be removed from entity - and new attributes made as well). I need to be able to store the values - so for example I have a list of ...
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How is it possible to model in a database many different products?

For example, a smartphone might have attributes such as RAM and camera resolution, whereas a fridge has way different attributes. Is there a way to store these data in a relational database?
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Adding LIMIT changes PostgreSQL plan from good to a bad one

I have a query on a typical EAV schema: SELECT contacts.id FROM contacts LEFT OUTER JOIN (SELECT DISTINCT contacts_values.company_id AS company_id, contacts_values.id AS id ...
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Using rows from one table as fields in SELECT

I have three tables in my MySQL database - company, extra_fields and extra_fields_info: mysql> describe company; +-----------------------------+------------------+------+-----+---------+-------+ | ...
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Is EAV a good choice for scenario when the number of fields may differ client to client?

Suppose that you are developing an application that could be used by multiple clients. You have to store "basic details" of an employee of a company (your client) into your database. The first 15 ...
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How to store a bunch of columns and where you don't know how many there will be, the columns change, and new columns are introduced

So the so source of the data is the internet, and random bots that submit values to my apache server. Periodically new columns appear, but they are not always present. The other problem is then you ...
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EAV in postgresql

I'm building an application that needs to be deployed several times, with a relatively well organized data model. A table needs to be configured for each deployment with a small number of additional ...
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Need help in picking solution and understanding when to add columns vs EAV

I've been working on the following problem for a long time and I can't decide between two solutions. While both would work to solve the problem, neither "feels" exactly right to me. Any advice on ...
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Modelling products along with their attributes and discounts for an e-Commerce database

Scenario My application will have products belonging to 1 company. Each of those products will: Have at least 1 quantity Have 0 or more discounts Have 1 or more attributes Belong to 1 category, which ...
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How to find an entry from filtering with two associated tables

This questions has spinned off of another question I probably did not ask correctly from the get go. I have some tables, where attributes and attributes_entries that hold a pair of dynamic values for ...
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MySQL Query to Display Organized by Date

I'm good with basic types of queries but this has me stumped. I have the table schema listed below, I need display the results in a table, with each row displaying the available results for a given ...
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1 answer
470 views

How To Store EAV Data When It Has Nested Objects/Entities

I have json data that have both nested objects and attributes. Eg of one json object: (After json_decode into an array:) Array ( [attributename1] => attributevalue1 [attributename2] => ...
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Is it Possible to have a database table table of morethan 3000 fields [closed]

I have a form of more than 3000 fields and i want to create a table without splitting it into two. Is it okay? Or it will have problems?
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I would like to get a unique based on email address (MySQL)

I can work on basic queries and have been having a bit of trouble the way Wordpress stores their database information. The below query I have been using to download all form submissions for contests ...
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1 answer
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pulling multiple entries from a match of two tables

I have two tables, attributes and attributes_entries attributes hold the title and attribute_entries hold the value of that title. if I do: SELECT attribute_entries.title AS ent_title, ...
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1 answer
1k views

MYSQL Select data from two different tables BUT represent the data in multiple rows

I am needing to select all email addresses from two different tables with a single query. The goal of this is to list out all email addresses a client has per row. Both tables are structured ...
1 vote
1 answer
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SQL to merge related documents into 1 query row (MySQL)

I'm working with the following data structure: users | field| value | --- | --- | id | 123 | email| example@example.com fields | field |value | --- |--- | parentId |123 -> users.id | ...
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Return proper column based on other column's values

Consider an EAV table with separate columns for each datatype: CREATE TABLE eav_values ( id INT NOT NULL AUTO_INCREMENT PRIMARY KEY, entity_id INT NOT NULL, name VARCHAR(127) NOT NULL, ...
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Query product and product variants based on properties

I'm trying to build a filter system for an e-commerce application. The following schema is given: http://sqlfiddle.com/#!9/18b93 A product has many variants A variant as has many property_values A ...
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Query polymorphic relation table

I'm trying to query the following table: +----+------------------+----------------+-------------+-------+ | id | describable_type | describable_id | property_id | value | +----+------------------+----...
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Database Design - Custom Attributes / Columns

So I'm trying to figure out the best way to go about handling this database design wise. This is a rough idea of how I THINK it should go, but not really sure. If I have orders that have their own ...
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MYSQL Multiple table optimization for advanced search

I have a users table where there is the basic information of each user: CREATE TABLE `users` ( `user_id` int(11) NOT NULL AUTO_INCREMENT, `account_type` varchar(10) NOT NULL, `email` varchar(...
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PRODUCT_ID as primary key rather then the UPC(UNIVERSAL PRODUCT CODE) [closed]

I have a very strange kind of question in my mind, I'm using the EAV model in my E-COMMERCE DB. I have a product table with primary key p_id which is auto_increment, and to save its attributes I have ...
2 votes
1 answer
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What is the proper way of designing database with dynamic fields in MySQL + PHP?

I need help on designing a proper structure for a database table with dynamic fields. I am using MySql with PHP and the system I'm currently working on (inventory system) requires a table that accepts ...
1 vote
1 answer
1k views

Opencart mysql query optimize

I am using Opencart 2.x with mysql. I have created a custom module for excel export. My query took more than 2 minutes to execute. So I want to optimize my query. EXPLAIN shows the following image ...
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4 votes
3 answers
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What normalization rules does this table break

Our previous DBA got fed up with the development teams frequent requests to change the database schema to add and delete columns. He then advised to the developers that he would create simple tables ...
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2 answers
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need to change time value stored in VARCHAR column

I am using freeradius base billing system which is using mysql as its backend DB engine. Table structure is as follows, Thousands of users account expiration is stored in VARCHAR column and I cannot ...
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How to query a table with different values on the same fields?

I'm currently having some trouble with a search query I'm doing in MySQL. I have a table that stores form data for different fields of a course, with two foreign keys (courseid and fieldid). There is ...
1 vote
1 answer
351 views

Table with relation to two others (three-way relation?)

I stumbled across a weird situation that one table has relation to two others but record in it can only have a relation to one of the tables. To clarify things, I have tables: attribute, visit, ...
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How best to store complex cost information

I am creating a database to store data related to costs. The cost information can be very varied and I won't be able to fully determine all possible columns currently. An example piece of data might ...