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SQL (Structured Query Language) is a query language designed to manage and manipulate relational databases. It lets people interact with databases. SQL enables users to execute various operations, including querying data, updating data, adding and removing entries, establishing and altering database structures, and managing permissions. An SQL cheat sheet is something you might have heard often about. But what is an SQL cheat sheet?
Click here to learn more about the SQL cheat sheet and how to use each command!
SQL Cheat Sheet: Introduction
SQL, or Structured Query Language, is a language for communicating with databases. It allows you to choose particular data and create intricate reports. SQL is now considered a universal data language. It is utilized in almost every technology that processes data. SQL Cheat Sheet is something very important that one has to learn if they have to efficiently work with SQL. Let us learn more about SQL cheat sheet.
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What Is SQL Cheat Sheet?
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The SQL cheat sheet lists the most frequently used SQL statements for your convenience. Some of the important SQL Cheat Sheet are listed here for your reference. Do you want to learn more SQL cheat sheet commands? Do you want to learn SQL from a reliable source offering valuable certification? Join the Entri Full stack course today! The Entri Elevate full-stack developer course may be a better option for people who prefer to devote serious time and effort to full-stack programming. You may collaborate with industry professionals from top-tier industries, corporations, and organizations. The Entri Elevate Full Stack Web Development Course has been certified by Illinois Tech. Users who finish the program will get distinguished badges from Illinois Tech.
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SQL Cheat Sheet: Basics to Advanced (2024)
The SQL cheat sheets that are most prominent in the year 2024 are listed below.
Data Manipulation Language DML Commands
The SQL instructions that manipulate data in the database are classified as DML, or Data Manipulation Language, and constitute the majority of SQL statements. It is the SQL statement component responsible for controlling data and database access. Essentially, DCL statements are combined with DML statements.
| No. | Command | Syntax | Description |
| 1 | SELECT | SELECT column1, column2 FROM table_name; | Retrieves data from a database |
| 2 | INSERT | INSERT INTO table_name
(column1, column2) VALUES (value1, value2); |
Adds new records to a table |
| 3 | UPDATE | UPDATE table_name SET column1
= value1, column2 = value2 WHERE condition; |
Used to modify existing records in a table |
| 4 | DELETE | DELETE FROM table_name WHERE
condition; |
Removes records from a table |
Data Definition Language DDL Commands
The SQL commands that may be used to specify the database structure are known as DDL or Data Definition Language. It is used to construct and alter the structure of database objects in the database and only works with descriptions of the database schema. Database structures may be created, altered, and deleted using the DDL set of SQL commands, however, data cannot be deleted. General users should utilize applications to access databases. They typically do not use these commands.
| No. | Command | Syntax | Description |
| 1 | CREATE | CREATE TABLE table_name (column1 datatype1,
column2 datatype2, ); |
creates a new database and objects, |
| 2 | ALTER | ALTER TABLE table_name ADD column_name datatype; | adds, deletes, or modifies columns in an existing table |
| 3 | DROP | DROP TABLE table_name; | used to drop an existing table in a database |
| 4 | TRUNCATE | TRUNCATE TABLE table_name; | used to delete the data inside a table, but not the table itself |
Data Control Language DCL Commands
DCL has commands like GRANT and REVOKE that primarily deal with the database system’s rights, permissions, and other controls.
| No. | Commands | Syntax | Description |
| 1 | GRANT | GRANT SELECT, INSERT ON
table_name TO user_name; |
Used to give specific privileges to users or roles. |
| 2 | REVOKE | REVOKE SELECT, INSERT ON
table_name FROM user_name; |
Used to take away privileges
previously granted to users or roles. |
DQL (Data Query Language)
DQL statements are used to run queries on data contained in schema objects. The DQL command’s goal is to get a schema relation based on the query that is supplied to it. Here is how we may define DQL: It is a part of the SQL statement that enables ordering data that is pulled from the database. The SELECT statement is part of it. With the help of this command, data may be extracted from the database and used for various purposes.
| No. | Commands | Syntax | Description |
| 1 | SELECT Statement | SELECT column1, column2 FROM table_name; | the primary command used to
retrieve data from a database |
TCL (Transaction Control Language)
Transactions combine several tasks into a single unit of execution. Every transaction starts with a particular task and concludes when every work in the group has been properly finished. The transaction fails if any of the tasks are unsuccessful. A transaction may thus only have two possible outcomes: success or failure.
| No. | Commands | Syntax | Description |
| 1 | COMMIT | COMMIT; | used to save all the changes made during the current transaction and make them permanent. |
| 2 | ROLLBACK | ROLLBACK; | used to undo all the changes made during the current transaction and
discard them. |
| 3 | SAVEPOINT | SAVEPOINT savepoint_name; | used to set a point within a transaction to which you can later roll back. |
| 4 | ROLLBACK TO
SAVEPOINT |
ROLLBACK TO SAVEPOINT
savepoint name; |
used to roll back to a specific savepoint within a transaction. |
| 5 | SET TRANSACTION | SET TRANSACTION [ISOLATION LEVEL { READ
COMMITTED | SERIALIZABL E }] |
used to configure properties for the
current transaction |
SQL Cheat Sheet: Conclusion
The majority of websites and apps utilize relational databases in some form or another. This makes SQL incredibly useful since it enables you to build complex but still functioning systems. SQL is an extremely sophisticated and adaptable language for handling and modifying relational databases. This comprehensive cheat sheet covers a wide range of SQL commands and ideas, from database setup to advanced subjects such as stored procedures, triggers, and user-defined functions. This cheat sheet is a great resource for both newcomers learning SQL principles and experienced users wishing to improve their database administration and manipulation skills.
Frequently Asked Questions
What does “SELECT” command do?
Probably the most used SQL statement is SELECT. It will be useful almost every time you run a SQL data query. You can specify the type of data that you wish your query to yield.
What does “CREATE” command do?
A table, index, view, or database can be set up using CREATE.
What does “LIKE” command do?
LIKE looks through a column for a certain pattern.
What does “AND” command do?
A query that has two or more criteria is combined with AND. For the result to be returned, every condition must be satisfied.
What does “OR” command do?
An OR query combines two or more requirements into one. For a result to be returned, just one of the requirements has to be satisfied.
