Indexes in SQL

Indexes in SQL

Is it possible to set indexes between tables in SQL expression?

You can establish indexes on SQL tables, but SQL indexes do not create an implied relationship between tables. If you are familiar with PC databases like dBASE, SQL indexes are completely different ? to indicate a relationship between tables in SQL, you need to use the syntax in the CREATE TABLE command that establishes PRIMARY and FOREIGN keys. If your SQL database does not support referential integrity (PRIMARY and FOREIGN keys), you will not be able to establish a formal relationship between two tables. Even without referential integrity,this does not keep you from treating two tables as if they are related.If you need to retrieve data from two logically related tables, you simplyperform an equijoin, something like this:

        SELECT Orders.ordernumber, Items.quantity, Items.partno                FROM Orders, Items                WHERE Orders.ordernumber = Items.ordernumber;

Share the Post:
Heading photo, Metadata.

What is Metadata?

What is metadata? Well, It’s an odd concept to wrap your head around. Metadata is essentially the secondary layer of data that tracks details about the “regular” data. The regular

XDR solutions

The Benefits of Using XDR Solutions

Cybercriminals constantly adapt their strategies, developing newer, more powerful, and intelligent ways to attack your network. Since security professionals must innovate as well, more conventional endpoint detection solutions have evolved

AI is revolutionizing fraud detection

How AI is Revolutionizing Fraud Detection

Artificial intelligence – commonly known as AI – means a form of technology with multiple uses. As a result, it has become extremely valuable to a number of businesses across

AI innovation

Companies Leading AI Innovation in 2023

Artificial intelligence (AI) has been transforming industries and revolutionizing business operations. AI’s potential to enhance efficiency and productivity has become crucial to many businesses. As we move into 2023, several

data fivetran pricing

Fivetran Pricing Explained

One of the biggest trends of the 21st century is the massive surge in analytics. Analytics is the process of utilizing data to drive future decision-making. With so much of