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SQL handleiding

SQL TUIS SQL Inleiding SQL-sintaksis SQL Kies SQL Kies Distinct SQL Waar SQL En, of, nie SQL Bestel deur SQL Voeg in SQL nulwaardes SQL-opdatering SQL verwyder SQL Kies Top SQL Min en Max SQL-telling, gemiddeld, som SQL Soos SQL Wildcards SQL in SQL Tussen SQL aliasse SQL sluit aan SQL Inner Sluit aan SQL Links Sluit aan SQL Reg Sluit aan SQL Volledige Aansluiting SQL Self Sluit aan SQL Unie SQL Groep deur SQL het SQL bestaan SQL Enige, Almal SQL Kies In SQL Voeg in Kies SQL-geval SQL nul-funksies SQL gestoorde prosedures SQL opmerkings SQL-operateurs

SQL- databasis

SQL Skep DB SQL Drop DB SQL Backup DB SQL Skep tabel SQL Drop Tabel SQL Verander Tabel SQL-beperkings SQL nie nul nie SQL Uniek SQL Primêre Sleutel SQL buitelandse sleutel SQL Check SQL verstek SQL-indeks SQL Outo-verhoging SQL datums SQL-aansigte SQL-inspuiting SQL Hosting SQL-datatipes

SQL- verwysings

SQL sleutelwoorde
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-funksies
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 funksies
Stringfunksies: ASCII CHAR CHARINDEX KONCAT Verbind met + CONCAT_WS DATALENTE VERSKIL FORMAAT LINKS LEN LAER LTRIM NCHAR PATINDEX KWOTNAAM VERVANG HERHAAL OMKEER REGS RTRIM SOUNDEX RUIMTE STR GOED SUBSTRING VERTAAL TRIM UNICODE BOONSTE Numeriese funksies: ABS ACOS SOOS IN ATAN ATN2 AVG PLAFOND TEL COS COT GRADE EXP VLOER MELD LOG10 MAKS MIN PI KRAG RADIALE RAND RONDE TEKEN SONDER SQRT VIERKANT SOM TAN Datum funksies: CURRENT_TIMESTAMP DATEADD DATEDIFF DATEFROMPARTS DATENAME DATUMDEEL DAG GETDATE GETTUTCDATE ISDATE MAAND SYSDATETYD JAAR Gevorderde funksies GOOI VERBIND BEKEER HUIDIGE GEBRUIKER IIF UITNULLE ISNUMERIES NULLIF SESSION_USER SESSION PROPERTY SYSTEM_USER USER_NAME
MS Access funksies
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 Vinnige Verw

SQL voorbeelde

SQL voorbeelde SQL vasvra SQL-oefeninge SQL-sertifikaat

SQL Server CAST() Funksie

❮ SQL-bedienerfunksies

Voorbeeld

Skakel 'n waarde om na 'n int datatipe:

SELECT CAST(25.65 AS int);

Definisie en gebruik

Die CAST()-funksie skakel 'n waarde (van enige tipe) om in 'n gespesifiseerde datatipe.

Wenk: Kyk ook na die CONVERT() funksie.

Sintaksis

CAST(expression AS datatype(length))

Parameterwaardes

Value Description
expression Required. The value to convert
datatype Required. The datatype to convert expression to. Can be one of the following: bigint, int, smallint, tinyint, bit, decimal, numeric, money, smallmoney, float, real, datetime, smalldatetime, char, varchar, text, nchar, nvarchar, ntext, binary, varbinary, or image
(length) Optional. The length of the resulting data type (for char, varchar, nchar, nvarchar, binary and varbinary)

Tegniese besonderhede

Werk in: SQL Server (begin met 2008), Azure SQL Database, Azure SQL Data Warehouse, Parallel Data Warehouse

Meer voorbeelde

Voorbeeld

Skakel 'n waarde om na 'n varchar datatipe:

SELECT CAST(25.65 AS varchar);

Voorbeeld

Skakel 'n waarde om na 'n datum-tyd-datatipe:

SELECT CAST('2017-08-25' AS datetime);

❮ SQL-bedienerfunksies