[ORACLE] mssql과 oracle 비교 함수

MSSQL VS ORACLE
함수며 문법이며.ㅡㅡ 맨날해도 헷갈린다.ㅋㅋㅋㅋㅋ

하는데 왜 맨날 안외워질까.ㅋㅋ 돌머리..ㅋㅋ

문자열 함수

Function	Oracle	SQL Server
Convert character to ASCII	ASCII	ASCII
String concatenate	CONCAT	(expression + expression)
Convert ASCII to character	CHR	CHAR
Return starting point of character in character string (from left)	INSTR	CHARINDEX
Convert characters to lowercase	LOWER	LOWER
Convert characters to uppercase	UPPER	UPPER
Pad left side of character string	LPAD	N/A
Remove leading blank spaces	LTRIM	LTRIM
Remove trailing blank spaces	RTRIM	RTRIM
Starting point of pattern in character string	INSTR	PATINDEX
Repeat character string multiple times	RPAD	REPLICATE
Phonetic representation of character string	SOUNDEX	SOUNDEX
String of repeated spaces	RPAD	SPACE
Character data converted from numeric data	TO_CHAR	STR
Substring	SUBSTR	SUBSTRING
Replace characters	REPLACE	STUFF
Capitalize first letter of each word in string	INITCAP	N/A
Translate character string	TRANSLATE	N/A
Length of character string	LENGTH	DATALENGTH or LEN
Greatest character string in list	GREATEST	N/A
Least character string in list	LEAST	N/A
Convert string if NULL	NVL	ISNULL

 

Date 함수

Function	Oracle	SQL Server
Date addition	(use +)	DATEADD
Date subtraction	(use -)	DATEDIFF
Last day of month	LAST_DAY	N/A
Time zone conversion	NEW_TIME	N/A
First weekday after date	NEXT_DAY	N/A
Convert date to string	TO_CHAR	DATENAME
Convert date to number	TO_NUMBER(TO_CHAR())	DATEPART
Convert string to date	TO_DATE	CAST
Get current date and time	SYSDATE	GETDATE()