This content originally appeared on Level Up Coding - Medium and was authored by Sarang S
Overview
Structured Query Language is used for managing and changing relational databases (SQL). It is an essential tool for any data-driven organization, and expertise in SQL is a must-have for data analysts, data scientists, and database administrators.
You must have a thorough understanding of SQL and the most popular SQL commands if you’re getting ready for a job interview in these domains.
In this article, we’ll cover essential SQL commands that you need to know to ace your next job interview.
SQL Features
SQL gives us the ability to interact with databases and extract/manipulate data from them. We can build our own databases using SQL, then add data to them in the form of tables.
Using SQL, the following operations can be carried out on a database:
- Database creation and deletion.
- Add, modify, or remove certain tables from a database.
- Data from tables can be inserted, selected, updated, and deleted.
- Database views can be created.
- Run a number of aggregate functions.
Why this SQL Command Cheat Sheet is for You?
This SQL Command Cheat Sheet is a valuable resource designed to cater to individuals at all skill levels who work with databases or are aspiring to enter the field of data management. Whether you are a beginner learning SQL for the first time or an experienced database professional looking for a handy reference guide, this cheat sheet has something to offer.
For beginners, this cheat sheet serves as an excellent starting point. It provides a concise overview of the most commonly used SQL commands and their syntax, making it easy to understand and apply them in real-world scenarios. With clear explanations and examples, it simplifies the learning process, enabling you to quickly grasp the fundamental concepts of SQL.
Even if you have some experience with SQL, this cheat sheet can be immensely helpful, especially for data scientists, data analysts, etc. It acts as a quick reference guide, allowing you to refresh your memory and find the syntax for specific commands without the need for extensive searching. With its comprehensive coverage of SQL commands, including querying, data manipulation, table creation, and more, this cheat sheet provides data scientists and data analysts with a valuable resource for efficiently managing and analyzing large datasets. Whether you need to retrieve specific information, perform complex data transformations, or create new tables for analysis, this cheat sheet offers a convenient reference that empowers you to leverage the power of SQL in your data-driven work.
Let us get started!
Create Database and table commands
SQL Data Types Cheat Sheet
Date / Time data types
Numeric Data types
Text Data Types
Other data types
MySQL SELECT statement command
MySQL WHERE clause with AND, OR, IN, NOT IN commands
MySQL Command INSERT INTO Table
MySQL DELETE command
MySQL Update Command
ORDER BY in MySQL: DESC & ASC command
MySQL GROUP BY and HAVING Clause command
Grouping and aggregate functions
MySQL Wildcards commands
MySQL in Views commands
MySQL Index commands
MySQL commands for Joining Tables
MySQL SubQuery commands
MySQL LIMIT
MYSQL — ALTER, DROP, RENAME, MODIFY
MySQL Aggregate function commands
MYSQL Regular Expressions (REGEXP)
Regular expression Metacharacters
Stored functions
MySQL IS NULL & IS NOT NULL commands
MySQL AUTO_INCREMENT commands
Conclusion
- SQL (Structured Query Language) is used to manage and manipulate relational databases.
- In a relational database, data is arranged into tables that are connected by relationships.
- JOIN statements are used to combine data from two or more tables in a relational database.
- WHERE clauses are used to filter the results of a SELECT statement based on a specified condition.
- ORDER BY statements are used to sort the result set of a SELECT statement based on one or more columns.
- INSERT INTO statements are used to add new rows to a table, UPDATE statements are used to modify existing rows, and DELETE FROM statements are used to remove rows from a table.
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SQL Commands Cheat Sheet for your Next Job Interview was originally published in Level Up Coding on Medium, where people are continuing the conversation by highlighting and responding to this story.
This content originally appeared on Level Up Coding - Medium and was authored by Sarang S
Sarang S | Sciencx (2023-05-18T02:54:40+00:00) SQL Commands Cheat Sheet for your Next Job Interview. Retrieved from https://www.scien.cx/2023/05/18/sql-commands-cheat-sheet-for-your-next-job-interview/
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