Conversion of Oracle TO_CHAR(datetime) with format string to MySQL

The Oracle TO_CHAR(datetime, fmt) function converts datetime values to a string in the format specified by the fmt option.

MySQL has the DATE_FORMAT function that allows datetime values converting to a string in the specified format.

SQLWays converts the Oracle TO_CHAR function to the MySQL DATE_FORMAT function and converts elements of format string from Oracle to corresponding specifier in MySQL as specified in the following table.

TABLE 56. Conversion of Oracle TO_CHAR(datetime) with format string to MySQL

Mapping of datetime format specifiers between MySQL and Oracle
MySQL	Oracle (independently from register)	Description
%a	DY	Abbreviated weekday name (Sun..Sat)
%b	MON	Abbreviated month name (Jan..Dec)
%D	-	Day of the month with English suffix (0th, 1st, 2nd, 3rd, etc.)
%d %e	DD	Day of the month, numeric ((00..31) and (0..31))
%j	DDD	Day of year (001..366)
%m %c	MM	Month, numeric ((00..12) and (0..12))
%m %c	MM	Month, numeric ((00..12) and (0..12))
%M	MONTH	Month name (January..December)
%f	-	Microseconds (000000..999999)
%i	MI	Minutes, numeric (00..59)
%h %I %l	HH HH12	Hour ((01..12) and (1..12))


%H %k	HH24	Hour ((00..23) and (0..23))
%H %k	HH24	Hour ((00..23) and (0..23))
%p	AM PM	AM or PM
%r	-	Time, 12-hour (hh:mm:ss followed by AM or PM)
%S %s	SS	Seconds ((00..59) and (0..59))
%S %s	SS	Seconds ((00..59) and (0..59))
%T	-	Time, 24-hour (hh:mm:ss)
%u	WW IW	Week (00..53), where Monday is the first day of week
%U	-	Week (00..53), where Sunday is the first day of week
%V	-	Week (01..53), where Sunday is the first day of week, used with %X
%v	WW IW	Week (01..53), where Monday is the first day of week, used with %x
%W	DAY	Weekday name (Sunday..Saturday)
%w	-	Day of the week (0=Sunday .. 6=Saturday)
%X	-	Year for the week, where Sunday is the first day of the week, numeric 4 digits; used with %V
%x	-	Year for the week, where Monday is the first day of the week, numeric 4 digits; used with %v
%Y	YYYY SYYYY IYYY	Year, numeric, 4 digits
%y	YY IYY	Year, numeric, 2 digits
-	J	Julian day; the number of days since January 1, 4712 BC.
-	Q	Quarter of year (1, 2, 3, 4; JAN-MAR = 1).
-	RR	Given a year with 2 digits: · If the year is <50 and the last 2 digits of the current year are >=50, then the first 2 digits of the returned year are 1 greater than the first 2 digits of the current year. · If the year is >=50 and the last 2 digits of the current year are <50, then the first 2 digits of the returned year are 1 less than the first 2 digits of the current year.
-	RRRR	Round year. Accepts either 4-digit or 2-digit input. If 2-digit, provides the same return as RR. If you don't want this functionality, then simply enter the 4-digit year.
-	W	Week of month (1-5) where week 1 starts on the first day of the month and ends on the seventh.
-	SSSSS	Seconds past midnight (0 - 86399).
-	X	Local radix character.
-	Y,YYY	Year with comma in the position.
-	YEAR SYEAR	Year, spelled out; "S" prefixes BC dates with "-".
-	YYY	3 digits of year.
-	Y	1 digit of year.
-	IY	2 digits of ISO year.
-	I	1 digit of ISO year.
-	AD A.D.	AD indicator with or without periods.
-	BC B.C.	BC indicator with or without periods.
-	CC SCC	One greater than the first two digits of a four-digit year; "S" prefixes BC dates with "-". For example, '20' from '1900'.
-	D	Day of week (1 - 7).
-	A.M. P.M.	Meridian indicator with periods.
-	TZH	Time zone hour.
-	TZM	Time zone minute.
-	TZR	Time zone region information.
-	RM

TABLE 57. Example of Conversion

Oracle	MySQL
create procedure sp_to_char_date_format as begin -- GET ACTUAL TIME AND DATE select to_char(sysdate,'DD-MON-YYYY:HH24:MI') from dual; end;	create procedure sp_to_char_date_format() begin -- GET ACTUAL TIME AND DATE select DATE_FORMAT(CURRENT_TIMESTAMP, '%e-%M- %Y:%H:%i') from dual; end;

Oracle

MySQL

create procedure sp_to_char_date_format

            as

            begin

            -- GET ACTUAL TIME AND DATE

            select to_char(sysdate,'DD-MON-YYYY:HH24:MI') 

            from dual;

            end;

create procedure sp_to_char_date_format()

            begin

            -- GET ACTUAL TIME AND DATE

            select  DATE_FORMAT(CURRENT_TIMESTAMP, '%e-%M-

            %Y:%H:%i')  from dual;

            end;

MSN:

posted on 2010-04-22 17:00 kylixlu 阅读(1194) 评论(0) 编辑收藏

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