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Tutorial SQL

INICIO SQL Introducción a SQL Sintaxis SQL Seleccionar SQL SQL Seleccionar Distinto SQL donde SQL y, o no Orden SQL por Insertar SQL en Valores nulos de SQL Actualización SQL Eliminar SQL SQL Seleccionar parte superior SQL mínimo y máximo Recuento de SQL, Promedio, Suma SQL como Comodines de SQL SQL en SQL entre Alias ​​SQL Uniones SQL Combinación interna de SQL Unión izquierda de SQL Unión derecha de SQL Unión completa de SQL Unión automática de SQL Unión SQL Grupo SQL por SQL teniendo SQL existe SQL Cualquiera, Todo SQL Seleccionar en Insertar SQL en Seleccionar Caso SQL Funciones nulas de SQL Procedimientos almacenados de SQL Comentarios SQL Operadores SQL

Base de datos SQL

SQL Crear base de datos Base de datos de caída de SQL Base de datos de copia de seguridad de SQL Crear tabla SQL Tabla desplegable de SQL Tabla de modificación de SQL Restricciones SQL SQL no nulo SQL único Clave principal de SQL Clave foránea de SQL Comprobación SQL Valor predeterminado de SQL Índice SQL Incremento automático de SQL Fechas SQL Vistas SQL Inyección SQL Alojamiento SQL Tipos de datos SQL

Referencias SQL

Palabras clave de SQL
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
Funciones MySQL
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
Funciones del servidor SQL
Funciones de cadena: ASCII CARBONIZARSE CARÍNDICE CONCAT Conectar con + CONCAT_WS LONGITUD DE DATOS DIFERENCIA FORMATO IZQUIERDA LARGO MÁS BAJO LTRIM NCHAR PATÍNDICE COTIZACIÓN REEMPLAZAR REPRODUCIR EXACTAMENTE CONTRARRESTAR DERECHO RTRIM SOUNDEX ESPACIO FUERZA COSAS SUBCADENA TRADUCIR PODAR UNICODIGO SUPERIOR Funciones numéricas: abdominales ACOS COMO EN UN BRONCEADO ATN2 PROMEDIO TECHO CONTAR porque CUNA GRADOS Exp PISO INICIAR SESIÓN LOG10 MÁX. MÍN. Pi ENERGÍA RADIANES RAND RONDA FIRMAR SIN SQRT CUADRADO SUMA BRONCEARSE Funciones de fecha: FECHA Y HORA ACTUAL AÑADIR FECHA FECHADIFF FECHA DE LAS PARTES NOMBRE DE FECHA FECHAPARTE DÍA OBTENER LA FECHA GETTUTCDATE ISDATE MES SYSDATETIME AÑO Funciones avanzadas ELENCO JUNTARSE CONVERTIR USUARIO ACTUAL IIF ES NULO ESNUMERICO NULLIF SESIÓN_USUARIO PROPIEDAD DE SESIÓN USUARIO_SISTEMA NOMBRE DE USUARIO
Funciones de MS Access
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
Referencia rápida de SQL

Ejemplos SQL

Ejemplos SQL Cuestionario de SQL Ejercicios SQL Certificado SQL

Funciones del servidor SQL

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SQL Server tiene muchas funciones integradas.

Esta referencia contiene cadenas, números, fechas, conversión y algunas funciones avanzadas en SQL Server.

Funciones de cadena de SQL Server

Function Description
ASCII Returns the ASCII value for the specific character
CHAR Returns the character based on the ASCII code
CHARINDEX Returns the position of a substring in a string
CONCAT Adds two or more strings together
Concat with + Adds two or more strings together
CONCAT_WS Adds two or more strings together with a separator
DATALENGTH Returns the number of bytes used to represent an expression
DIFFERENCE Compares two SOUNDEX values, and returns an integer value
FORMAT Formats a value with the specified format
LEFT Extracts a number of characters from a string (starting from left)
LEN Returns the length of a string
LOWER Converts a string to lower-case
LTRIM Removes leading spaces from a string
NCHAR Returns the Unicode character based on the number code
PATINDEX Returns the position of a pattern in a string
QUOTENAME Returns a Unicode string with delimiters added to make the string a valid SQL Server delimited identifier
REPLACE Replaces all occurrences of a substring within a string, with a new substring
REPLICATE Repeats a string a specified number of times
REVERSE Reverses a string and returns the result
RIGHT Extracts a number of characters from a string (starting from right)
RTRIM Removes trailing spaces from a string
SOUNDEX Returns a four-character code to evaluate the similarity of two strings
SPACE Returns a string of the specified number of space characters
STR Returns a number as string
STUFF Deletes a part of a string and then inserts another part into the string, starting at a specified position
SUBSTRING Extracts some characters from a string
TRANSLATE Returns the string from the first argument after the characters specified in the second argument are translated into the characters specified in the third argument.
TRIM Removes leading and trailing spaces (or other specified characters) from a string
UNICODE Returns the Unicode value for the first character of the input expression
UPPER Converts a string to upper-case

Funciones matemáticas/numéricas de SQL Server

Function Description
ABS Returns the absolute value of a number
ACOS Returns the arc cosine of a number
ASIN Returns the arc sine of a number
ATAN Returns the arc tangent of a number
ATN2 Returns the arc tangent of two numbers
AVG Returns the average value of an expression
CEILING Returns the smallest integer value that is >= a number
COUNT Returns the number of records returned by a select query
COS Returns the cosine of a number
COT Returns the cotangent of a number
DEGREES Converts a value in radians to degrees
EXP Returns e raised to the power of a specified number
FLOOR Returns the largest integer value that is <= to a number
LOG Returns the natural logarithm of a number, or the logarithm of a number to a specified base
LOG10 Returns the natural logarithm of a number to base 10
MAX Returns the maximum value in a set of values
MIN Returns the minimum value in a set of values
PI Returns the value of PI
POWER Returns the value of a number raised to the power of another number
RADIANS Converts a degree value into radians
RAND Returns a random number
ROUND Rounds a number to a specified number of decimal places
SIGN Returns the sign of a number
SIN Returns the sine of a number
SQRT Returns the square root of a number
SQUARE Returns the square of a number
SUM Calculates the sum of a set of values
TAN Returns the tangent of a number

Funciones de fecha de SQL Server

Function Description
CURRENT_TIMESTAMP Returns the current date and time
DATEADD Adds a time/date interval to a date and then returns the date
DATEDIFF Returns the difference between two dates
DATEFROMPARTS Returns a date from the specified parts (year, month, and day values)
DATENAME Returns a specified part of a date (as string)
DATEPART Returns a specified part of a date (as integer)
DAY Returns the day of the month for a specified date
GETDATE Returns the current database system date and time
GETUTCDATE Returns the current database system UTC date and time
ISDATE Checks an expression and returns 1 if it is a valid date, otherwise 0
MONTH Returns the month part for a specified date (a number from 1 to 12)
SYSDATETIME Returns the date and time of the SQL Server
YEAR Returns the year part for a specified date

Funciones avanzadas de SQL Server

Function Description
CAST Converts a value (of any type) into a specified datatype
COALESCE Returns the first non-null value in a list
CONVERT Converts a value (of any type) into a specified datatype
CURRENT_USER Returns the name of the current user in the SQL Server database
IIF Returns a value if a condition is TRUE, or another value if a condition is FALSE
ISNULL Return a specified value if the expression is NULL, otherwise return the expression
ISNUMERIC Tests whether an expression is numeric
NULLIF Returns NULL if two expressions are equal
SESSION_USER Returns the name of the current user in the SQL Server database
SESSIONPROPERTY Returns the session settings for a specified option
SYSTEM_USER Returns the login name for the current user
USER_NAME Returns the database user name based on the specified id

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