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SQL Tutorial

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SQL Database

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ADD ADD CONSTRAINT ALTER ALTER COLUMN ALTER TABLE ALL AND ANY AS ASC BACKUP DATABASE BETWEEN CASE CHECK COLUMN CONSTRAINT CREATE CREATE DATABASE CREATE INDEX CREATE OR REPLACE VIEW CREATE TABLE CREATE PROCEDURE CREATE UNIQUE INDEX CREATE VIEW DATABASE DEFAULT DELETE DESC DISTINCT DROP DROP COLUMN DROP CONSTRAINT DROP DATABASE DROP DEFAULT DROP INDEX DROP TABLE DROP VIEW EXEC EXISTS FOREIGN KEY FROM FULL OUTER JOIN GROUP BY HAVING IN INDEX INNER JOIN INSERT INTO INSERT INTO SELECT IS NULL IS NOT NULL JOIN LEFT JOIN LIKE LIMIT NOT NOT NULL OR ORDER BY OUTER JOIN PRIMARY KEY PROCEDURE RIGHT JOIN ROWNUM SELECT SELECT DISTINCT SELECT INTO SELECT TOP SET TABLE TOP TRUNCATE TABLE UNION UNION ALL UNIQUE UPDATE VALUES VIEW WHERE
MySQL Functions
String Functions: ASCII CHAR_LENGTH CHARACTER_LENGTH CONCAT CONCAT_WS FIELD FIND_IN_SET FORMAT INSERT INSTR LCASE LEFT LENGTH LOCATE LOWER LPAD LTRIM MID POSITION REPEAT REPLACE REVERSE RIGHT RPAD RTRIM SPACE STRCMP SUBSTR SUBSTRING SUBSTRING_INDEX TRIM UCASE UPPER Numeric Functions: ABS ACOS ASIN ATAN ATAN2 AVG CEIL CEILING COS COT COUNT DEGREES DIV EXP FLOOR GREATEST LEAST LN LOG LOG10 LOG2 MAX MIN MOD PI POW POWER RADIANS RAND ROUND SIGN SIN SQRT SUM TAN TRUNCATE Date Functions: ADDDATE ADDTIME CURDATE CURRENT_DATE CURRENT_TIME CURRENT_TIMESTAMP CURTIME DATE DATEDIFF DATE_ADD DATE_FORMAT DATE_SUB DAY DAYNAME DAYOFMONTH DAYOFWEEK DAYOFYEAR EXTRACT FROM_DAYS HOUR LAST_DAY LOCALTIME LOCALTIMESTAMP MAKEDATE MAKETIME MICROSECOND MINUTE MONTH MONTHNAME NOW PERIOD_ADD PERIOD_DIFF QUARTER SECOND SEC_TO_TIME STR_TO_DATE SUBDATE SUBTIME SYSDATE TIME TIME_FORMAT TIME_TO_SEC TIMEDIFF TIMESTAMP TO_DAYS WEEK WEEKDAY WEEKOFYEAR YEAR YEARWEEK Advanced Functions: BIN BINARY CASE CAST COALESCE CONNECTION_ID CONV CONVERT CURRENT_USER DATABASE IF IFNULL ISNULL LAST_INSERT_ID NULLIF SESSION_USER SYSTEM_USER USER VERSION
SQL Server Functions
String Functions: ASCII CHAR CHARINDEX CONCAT Concat with + CONCAT_WS DATALENGTH DIFFERENCE FORMAT LEFT LEN LOWER LTRIM NCHAR PATINDEX QUOTENAME REPLACE REPLICATE REVERSE RIGHT RTRIM SOUNDEX SPACE STR STUFF SUBSTRING TRANSLATE TRIM UNICODE UPPER Numeric Functions: ABS ACOS ASIN ATAN ATN2 AVG CEILING COUNT COS COT DEGREES EXP FLOOR LOG LOG10 MAX MIN PI POWER RADIANS RAND ROUND SIGN SIN SQRT SQUARE SUM TAN Date Functions: CURRENT_TIMESTAMP DATEADD DATEDIFF DATEFROMPARTS DATENAME DATEPART DAY GETDATE GETUTCDATE ISDATE MONTH SYSDATETIME YEAR Advanced Functions CAST COALESCE CONVERT CURRENT_USER IIF ISNULL ISNUMERIC NULLIF SESSION_USER SESSIONPROPERTY SYSTEM_USER USER_NAME
MS Access Functions
String Functions: Asc Chr Concat with & CurDir Format InStr InstrRev LCase Left Len LTrim Mid Replace Right RTrim Space Split Str StrComp StrConv StrReverse Trim UCase Numeric Functions: Abs Atn Avg Cos Count Exp Fix Format Int Max Min Randomize Rnd Round Sgn Sqr Sum Val Date Functions: Date DateAdd DateDiff DatePart DateSerial DateValue Day Format Hour Minute Month MonthName Now Second Time TimeSerial TimeValue Weekday WeekdayName Year Other Functions: CurrentUser Environ IsDate IsNull IsNumeric
SQL Quick Ref

SQL Examples

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SQL. Lessons for beginners

Ua

SQL Online Editor (Compiler)

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SQL Editor

With our online SQL editor, you can edit SQL statements, and view the result in your browser.


Run »

Example

SELECT * FROM Customers;
ID Company Contact Country
1 Alfreds Futterkiste Maria Anders Germany
2 Centro comercial Moctezuma Francisco Chang Mexico
3 Ernst Handel Roland Mendel Austria
Try it Yourself »

Click on the "Try it Yourself" button to see how it works.

Publish Your Code

If you want to create your own website, or web applications with a SQL Database, check out W3Schools Spaces.

W3Schools Spaces is a website-building tool that enables you to create and share your website.

In addition to a server, you get an SQL Database where you can store and access your data.

It's easy to use and doesn't require any setup.

Dynamic Spaces

The code editor is packed with features to help you achieve more:

  • Templates: Start from scratch or use a template
  • Cloud-based: no installations required. You only need your browser
  • Terminal & Log: debug and troubleshoot your code easily
  • File Navigator: switch between files inside the code editor
  • And much more!
Learn More

Learn Faster

Practice is key to mastering coding, and the best way to put your SQL knowledge into practice is by getting practical with code.

Use W3Schools Spaces to build, test and deploy code.

The code editor lets you write and practice different types of computer languages.

New languages are added all the time:

Languages
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If you don't know SQL, we suggest that you read our SQL Tutorial from scratch.

Easy Package Management

Get an overview of your packages and easily add or delete frameworks and libraries. Then, with just one click, you can make changes to your packages without manual installation.

Packages Spaces

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Build Powerful Websites

You can use the code editor in W3School Spaces to build frontend or full-stack websites from scratch.

Or you can use the 60+ templates available and save time:

Photographer website template
Blog website template
Webshop template
Tutor website template

Create your Spaces account today and explore them all!

Learn More

Share Your Website With The World

Host and publish your websites in no time with W3School Spaces.

W3Schools subdomain and SSL certificate are included for free with W3School Spaces. An SSL certificate makes your website safe and secure. It also helps people trust your website and makes it easier to find it online.

Want a custom domain for your website?

You can buy a domain or transfer an existing one and connect it to your space.

Learn More

How Does It Work?

Get started in a few clicks with W3School Spaces.

How Spaces Works on W3Schools
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