(Structured Query Language):** Standard language for interacting with relational databases, allowing data queries and manipulation.
Declarative language used to store and query structured data.
A common interface for databases and datalakes
Super underrated. Transactional properties make it fast and powerful to use.
## Advanced SQL topics you need to know.
# Learn GROUP BYs to aggregate values
SELECT
MAX(views) AS mostViews,
channelId
FROM
YoutubeVideos
GROUP BY
channelID
;
# Window functions are a must-have for interviews
SELECT
RANK() OVER(ORDER BY views) AS videoRanking
videoName,
FROM
YoutubeVideos
;
# Efficient schema designs go a long way
CREATE TABLE YoutubeVideos (
videoId INTEGER PRIMARY KEY
videoName VARCHAR(255),
views INTEGER,
likes INTEGER,
channelId INTEGER
);SQL is a standardized language used to interact with relational databases. It stands for structured query language (SQL) and defines a standard programming language utilized to extract, organize, manage, and manipulate data stored in relational databases.
Here are different levels you can go into (Source):
