The version number uses the formatMmmrr, whereMis a major version,mmis a two-digit minor version, andrris a two-digit release number. For example: In a statement to be run only by a MySQL server version 5.7.31 or later, use50731in the comment. ...
The version number uses the formatMmmrr, whereMis a major version,mmis a two-digit minor version, andrris a two-digit release number. For example: In a statement to be run only by a MySQL server version 8.0.31 or later, use80031in the comment. ...
显示数据类型转换 to_char函数对日期的转换:to_char(date, 'format_model'),日期的格式如下 to_char函数对数字的转换:to_char(number,'format_model'),数字转换的格式如下 通用函数 nvl(a,b):当a为null时,返回b;否则就返回a本身。 nvl2(a,b,c):当a为null时,返回c,否则返回b; nullif(a,b):当a = ...
format(format c) leading zeros) oo - day of year (three digit) D - day name short DD - day name long g - 12-hour hour format...of day (no leading zero) gg - 12-hour hour format of day (two digit) h - 24-hour hour format of day...(no leading zero) hh - 24-hour hour...
In MySQL, thedatetimedata type is used to store both date and time values in the formatYYYY-MM-DD HH:MI:SS. TheYYYYrepresents the four-digit year,MMrepresents the two-digit month,DDrepresents the two-digit day,HHrepresents the two-digit hour (in 24-hour format),MIrepresents the two-dig...
# if (strlen($number)==3 || strlen($number)==6 || strlen($number)==9) { # $thisdigit=substr($number,0,1); # if ($thisdigit) $words .= n2w_digit($thisdigit).' hundred'; # if (substr($number,1,1) || substr($number,2,1)) $words .= ' and '; ...
SELECT prod_name FROM products WHERE prod_name REGEXP ‘[[:digit:]]{4}’ ORDER BY prod_name; 匹配连在一起的任意4位数字。 编写某个特殊的表达式几乎总是有不知一种方法。 (等同于)SELECT prod_name FROM products WHERE prod_name REGEXP ‘[0-9][0-9][0-9][0-9]’ ORDER BY prod_name...
() --返回日期部分 Date_format(date,'%Y-%m-%d') --返回一个格式化的日期或时间串 DateDiff() --计算两个日期之差 Date_Add(date,INTERVAL 2 day/month/year) --日期运算函数 Year()/Month()/Day()/DayofWeek()/HOur()/Minute()/Second() Time() --返回时间部分 Now() --返回当前的日期时间 #...
Note also that some functions like MIN( ) and MAX( ) will convert a TIMESTAMP/DATE to a number. This means that a timestamp with a 2-digit year will not work properly with these functions. The fix in this case is to convert the TIMESTAMP/DATE to 4-digit year format or use somethi...
TIME(fsp)A time. Format: hh:mm:ss. The supported range is from '-838:59:59' to '838:59:59' YEARA year in four-digit format. Values allowed in four-digit format: 1901 to 2155, and 0000. MySQL 8.0 does not support year in two-digit format. ...