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SQL Tutorial

SQL HOME SQL Intro SQL Syntax SQL Select SQL Select Distinct SQL Where SQL Order By SQL And SQL Or SQL Not SQL Insert Into SQL Null Values SQL Update SQL Delete SQL Select Top SQL Aggregate Functions SQL Min and Max SQL Count SQL Sum SQL Avg SQL Like SQL Wildcards SQL In SQL Between SQL Aliases SQL Joins SQL Inner Join SQL Left Join SQL Right Join SQL Full Join SQL Self Join SQL Union SQL Group By SQL Having SQL Exists SQL Any, All SQL Select Into SQL Insert Into Select SQL Case SQL Null Functions SQL Stored Procedures SQL Comments SQL Operators

SQL Database

SQL Create DB SQL Drop DB SQL Backup DB SQL Create Table SQL Drop Table SQL Alter Table SQL Constraints SQL Not Null SQL Unique SQL Primary Key SQL Foreign Key SQL Check SQL Default SQL Index SQL Auto Increment SQL Dates SQL Views SQL Injection SQL Hosting SQL Data Types

SQL References

SQL Keywords
ADD ADD CONSTRAINT ALL ALTER ALTER COLUMN ALTER TABLE 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
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SQL Keywords Reference

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This SQL keywords reference contains the reserved words in SQL.

SQL Keywords

Keyword Description
ADD Adds a column in an existing table
ADD CONSTRAINT Adds a constraint after a table is already created
ALL Returns true if all of the subquery values meet the condition
ALTER Adds, deletes, or modifies columns in a table, or changes the data type of a column in a table
ALTER COLUMN Changes the data type of a column in a table
ALTER TABLE Adds, deletes, or modifies columns in a table
AND Only includes rows where both conditions is true
ANY Returns true if any of the subquery values meet the condition
AS Renames a column or table with an alias
ASC Sorts the result set in ascending order
BACKUP DATABASE Creates a back up of an existing database
BETWEEN Selects values within a given range
CASE Creates different outputs based on conditions
CHECK A constraint that limits the value that can be placed in a column
COLUMN Changes the data type of a column or deletes a column in a table
CONSTRAINT Adds or deletes a constraint
CREATE Creates a database, index, view, table, or procedure
CREATE DATABASE Creates a new SQL database
CREATE INDEX Creates an index on a table (allows duplicate values)
CREATE OR REPLACE VIEW Updates a view
CREATE TABLE Creates a new table in the database
CREATE PROCEDURE Creates a stored procedure
CREATE UNIQUE INDEX Creates a unique index on a table (no duplicate values)
CREATE VIEW Creates a view based on the result set of a SELECT statement
DATABASE Creates or deletes an SQL database
DEFAULT A constraint that provides a default value for a column
DELETE Deletes rows from a table
DESC Sorts the result set in descending order
DISTINCT Selects only distinct (different) values
DROP Deletes a column, constraint, database, index, table, or view
DROP COLUMN Deletes a column in a table
DROP CONSTRAINT Deletes a UNIQUE, PRIMARY KEY, FOREIGN KEY, or CHECK constraint
DROP DATABASE Deletes an existing SQL database
DROP DEFAULT Deletes a DEFAULT constraint
DROP INDEX Deletes an index in a table
DROP TABLE Deletes an existing table in the database
DROP VIEW Deletes a view
EXEC Executes a stored procedure
EXISTS Tests for the existence of any record in a subquery
FOREIGN KEY A constraint that is a key used to link two tables together
FROM Specifies which table to select or delete data from
FULL OUTER JOIN Returns all rows when there is a match in either left table or right table
GROUP BY Groups the result set (used with aggregate functions: COUNT, MAX, MIN, SUM, AVG)
HAVING Used instead of WHERE with aggregate functions
IN Allows you to specify multiple values in a WHERE clause
INDEX Creates or deletes an index in a table
INNER JOIN Returns rows that have matching values in both tables
INSERT INTO Inserts new rows in a table
INSERT INTO SELECT Copies data from one table into another table
IS NULL Tests for empty values
IS NOT NULL Tests for non-empty values
JOIN Joins tables
LEFT JOIN Returns all rows from the left table, and the matching rows from the right table
LIKE Searches for a specified pattern in a column
LIMIT Specifies the number of records to return in the result set
NOT Only includes rows where a condition is not true
NOT NULL A constraint that enforces a column to not accept NULL values
OR Includes rows where either condition is true
ORDER BY Sorts the result set in ascending or descending order
OUTER JOIN Returns all rows when there is a match in either left table or right table
PRIMARY KEY A constraint that uniquely identifies each record in a database table
PROCEDURE A stored procedure
RIGHT JOIN Returns all rows from the right table, and the matching rows from the left table
ROWNUM Specifies the number of records to return in the result set
SELECT Selects data from a database
SELECT DISTINCT Selects only distinct (different) values
SELECT INTO Copies data from one table into a new table
SELECT TOP Specifies the number of records to return in the result set
SET Specifies which columns and values that should be updated in a table
TABLE Creates a table, or adds, deletes, or modifies columns in a table, or deletes a table or data inside a table
TOP Specifies the number of records to return in the result set
TRUNCATE TABLE Deletes the data inside a table, but not the table itself
UNION Combines the result set of two or more SELECT statements (only distinct values)
UNION ALL Combines the result set of two or more SELECT statements (allows duplicate values)
UNIQUE A constraint that ensures that all values in a column are unique
UPDATE Updates existing rows in a table
VALUES Specifies the values of an INSERT INTO statement
VIEW Creates, updates, or deletes a view
WHERE Filters a result set to include only records that fulfill a specified condition

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