Learn SQL in a weekend: The definitive guide for creating and querying databases (Learn in a weekend Book 1) by Padial Solier Antonio
Author:Padial Solier, Antonio [Padial Solier, Antonio]
Language: eng
Format: epub
Published: 2020-04-21T16:00:00+00:00
ANTONIO
SÁNCHEZ CABALLERO
SILVIA
ROMERO FERNÁNDEZ
ANTONIO
SÁNCHEZ CABALLERO
Logical operators
Although it is common to look for rows based on just one column, we will be forced many times to make queries that involve some attributes.
Think, for example, when you are surfing an online shop. The normal thing is that you want to see products of a specific category (TVs, for instance) with a maximum price (900 €) and maybe you need to restrict the search to your favourite brands.
To be able to make those queries, we have two logical operators: AND and OR . Both of them “join” two conditions in the following way:
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