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Transitive Partial Dependencies - broken down, Better
The purpose/reason for this article is for those new to this, like me. I saw this LinkedIn article What are the steps to eliminate transitive dependencies in a database schema? and about barfed up my dinner, from two nights ago… Too dense and/or not broken down in a better manner. So, I attempted to do so for the others who are not experts (as I am not yet one). It is only for better…
Optimizing a Large SQL Server Table with a Better Primary Key
Introduction Inheriting a large SQL Server table with suboptimal indexing can be a daunting task, especially when dealing with a 10 TB table. In this article, we’ll explore a real-world scenario where a table uses a uniqueidentifier as its clustered primary key and has an unnecessary identity int column. We’ll discuss the steps to efficiently optimize this table by replacing the clustered…
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Understanding MySQL Clustered Index with Practical Examples
New Post has been published on https://www.codesolutionstuff.com/mysql-clustered-index-practical-examples/
Understanding MySQL Clustered Index with Practical Examples
MySQL is one of the most popular open-source relational database management systems (RDBMS) used for web applications, e-commerce websites, and other data-driven applications. Indexing is a crucial aspect of database design that helps to improve query performance and optimize data retrieval.
In SQL Server, we have two keys which distinctively or uniquely identify a record in the database. Both the keys seem identical, but actually, both are different in features and in behaviours. In this article, I would like to share the key differences between primary key and unique key.
SQL Primary Key
A Primary key is the field in the table that uniquely identifies each row & record in the database table.A Primary keys must have UNIQUE values, and cannot contain NULL values. The table may contain only one primary key, which may have one or more fields. When multiple fields are used as the primary key, they are called a composite key. Create Primary Key Table CREATE TABLE Students( ID INT NOT…
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Primary Key is an attribute or set of attributes that can uniquely identify a tuple in a relation. Primary key is a unique and not null attribute in a tuple.
Primary key RDBMS
A composite primary key, it should be defined at the table level. Let's learn the Difference between primary key and unique key.
La telefonata che ho fatto con @kon-igi mi ha ricordato il periodo di iscrizione al liceo. Mi recai una mattina all’Anagrafe per i soliti certificati nascita/residenza, vi giuro che ancora oggi io la racconto e le persone non ci credono, e non posso biasimarle.
TSA = Tizio allo sportello affianco
IO: mi chiamo Antonio XYZ
TSA: mi chiamo Antonio XYZ
IO: sono nato il giorno tal dei tali
TSA: sono nato il giorno tal dei tali
IO: a Paperolandia
TSA: a Paperolandia
IO: cognome della madre MAMI
TSA: cognome della madre MAMI
A questo punto ci guardiamo ...
ENTRAMBI: MA MI STAI PRENDENDO PER IL CULO?
Tutto spaventato, chiesi lumi a Mami 🧡, e mi spiegò che sì, siccome il mio nome e il mio cognome sono molto diffusi dalle mie parti (per quel discorso che si assegna ai figli il nome dei nonni, il che taglia le gambe alla diversità), quel giorno, nell’ospedale del paesello affianco, nacquero due Paperi, nello stesso giorno, con lo stesso cognome dei genitori. Quello che ci differenziava erano i nomi dei genitori e l’orario di nascita.
Lei sapeva tutto e mi aveva sempre nascosto la verità!
Mi andò di culo che il mio codice fiscale coincise con quello che viene generato automaticamente dai software disponibili, mentre il suo venne generato a mano, per gestire la collisione.
Da allora ho sempre usato questo caso come esempio su come sia importante definire la chiave di un insieme di dati.
