Suppose that I have tables (entities) in my website database: let it be 'Shoes', 'Hats' and 'Skates'. I don't want to create separate "comments" table for every entity (like 'shoes_comments', 'hats_comments', 'skates_comments'). My idea is to somehow store all the comments in …

Apr 2, 2024 · Building relationships in tables helps to organize and link data across multiple tables. Creating relationships among tables provides efficient data retrieval and maintenance maintenance. In this article, we will learn about relationships in SQL, and look at its types like one-to-one, one-to-many, many-to-many, etc.

May 2, 2019 · I want to create a table structure to store customers and I am facing a challenge: for each customer I can have multiple names, one being the primary one and the others being the alternative names. The initial take on the tables looks like this:

Dec 28, 2015 · I created all my parent tables and one respective child table for address and one for contact . I didn't create any relation between parent and child entities . I made the relation through one more table where I did the cross reference between all parent entities and child entity .

Jun 27, 2020 · We store the Client data in the client table, each client has an id. There are 3 simple ways I can think of to design this, but I want the most efficient, as some calls will have to select 10,000+ records for that Client (in the case of a large world map of events, for example).

Sep 14, 2022 · Syntactically at least, you can do this in SQL, however, unless you have some special database requirements, it's better design practice to have distinct comment tables for each. “Let’s say you have an entity called Comment” Nope, you don’t. You have entity called Article and another called Blog_Post.

In this chapter we'll explore the reasons for having multiple tables in a database, look at how to define relationships between different tables, and outline the different types of table relationships that can exist.

EF Core allows to map two or more entities to a single row. This is called table splitting or table sharing. To use table splitting the entity types need to be mapped to the same table, have the primary keys mapped to the same columns and at least one relationship configured between the primary key of one entity type and another in the same table.

Jun 24, 2015 · You could really use either option: one translation table with a FIELD_TYPE partitioning attribute, or a one translation table for each table requiring localization. The pros and cons of either approach are not likely to be related to …

Explore how to use an Entity Relationship Diagram in SQL to efficiently manage multi-table joins and construct complex queries for comprehensive data analysis.