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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
VOEG TOE VOEG BEPERKING BY VERANDER VERANDER KOLOM VERANDER TABEL ALMAL EN ENIGE AS ASC RUGSTEUN DATABASIS TUSSEN GEVAL TJEK KOLOM BEPERKING SKEP SKEP DATABASIS SKEP INDEKS 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
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 funksies
Stringfunksies: Asc Chr Betrek met & CurDir Formaat InStr InstrRev LCase Links Len LTrim Middel Vervang Reg RTrim Ruimte Verdeel Str StrComp StrConv StrReverse Sny UCase Numeriese funksies: Abs Atn Gem Cos Tel Exp Maak reg Formaat Int Maks Min Randomiseer Rondte Ronde Sgn Sqr Som Val Datum funksies: Datum Datum Voeg by DateDiff Datum Deel Datumreeks Datumwaarde Dag Formaat Uur Minuut Maand Maandnaam Nou Tweedens Tyd Tydreeks Tydwaarde Weeksdag Weekdagnaam Jaar Ander funksies: Huidige gebruiker Oor IsDatum IsNul Is Numeries
SQL Vinnige Verw

SQL voorbeelde

SQL voorbeelde SQL vasvra SQL-oefeninge SQL-sertifikaat

MS Access InstrRev() Funksie

❮ MS Access-funksies

Voorbeeld

Soek vir "t" in string "Customer" (begin vanaf die einde van die string) en keer terug posisie:

SELECT InstrRev("Customer", "t") AS MatchPosition;

Definisie en gebruik

Die InstrRev() funksie kry die posisie van die eerste voorkoms van 'n string in 'n ander, vanaf die einde van string.

Hierdie funksie voer 'n hoofletter-onsensitiewe soektog uit.

Sintaksis

InstrRev(string1, string2, start, compare)

Parameterwaardes

Parameter Description
string1 Required. The string to be searched
string2 Required. The string to search for
start Optional. The start position for the search. Position -1 is default (which means that it starts with the last character position)
compare Optional. The type of string comparison.

Possible values:
-1: Use the setting of Option Compare
0: Binary comparison
1: Textual comparison
2: Comparison based on info in your database

Terugkeerwaardes

  • As string2 nie binne string1 gevind word nie, gee hierdie funksie 0 terug
  • As string2 nul-lengte is, gee hierdie funksie die waarde in die beginparameter terug
  • As string1 nul-lengte is, gee hierdie funksie 0 terug
  • As string1 nul is, gee hierdie funksie nul terug
  • As begin > as die lengte van string2 is, gee hierdie funksie 0 terug

Tegniese besonderhede

Werk in: Van Access 2000

❮ MS Access-funksies