ADDDATE()和SUBDATE()是 DATE_ADD()和DATE_SUB()的同义词。 在mysql 3.23中,你可以使用+和-而不是DATE_ADD()和DATE_SUB()。(见例子) date是一个指定开始日期的DATETIME或DATE值,expr是指定加到开始日期或从开始日期减去 的间隔值一个表达式,expr是一个字符串;它可以以一个"-"开始表示负间隔。 type是一...
否则结果是一个DATETIME值。 mysql> SELECT "1997-12-31 23:59:59" + INTERVAL 1 SECOND; -> 1998-01-01 00:00:00 mysql> SELECT INTERVAL 1 DAY + "1997-12-31"; -> 1998-01-01 mysql> SELECT "1998-01-01" - INTERVAL 1 SECOND; -> 1997-12-31 23:59:59 mysql> SELECT DATE_ADD("19...
$datetime=date('Y-m-d H:i:s',$timestamp); echo"该时间戳代表的时间:",$datetime," \n"; echo"从此时间重新转回时间戳:",strtotime($datetime)," \n"; « 故障树的概念|Digest首页|Veritas Volume manager常用命令参考手册 » MYSQL中的日期转换 链接:http://www.eygle.com/digest/2006/09/mys...
1、date的格式可以是“15-12-31”,可以是“15-12-31 23:59:59”,也可以是“2015-12-31 23:59:59”,如果参数date是date格式,则返回date格式结果,如果参数date是datetime格式,则返回datetime格式结果 2、type格式: SECOND 秒 SECONDS MINUTE 分钟 MINUTES HOUR 时间 HOURS DAY 天 DAYS MONTH 月 MONTHS YEAR ...
支持小数秒的类型有:TIME、DATETIME和TIMESTAMP; 特殊的类型:YEAR; MySQL 8.0不支持两位的YEAR类型; 小数秒的精度可选值是0-6,默认是0,3代表毫秒,6代表微秒,而2代表10毫秒(如0.11就是110毫秒); 存储TIMESTAMP值时会将时间从当前时区转换成UTC时间,返回时再转换回当前时区; ...
{}#取HASH,没必要, 直接把SQL作为keyADDHOURS=datetime.timedelta(hours=8)PATTERN_UH=re.compile(r"\[([^\[\]]+)\]")PATTERN_KV=re.compile(r"(\w+):\s+([0-9.]+)")withopen(filename,'r')asf:log_time=None#日志记录时间, 基本上可以算是sql执行结束时间user_host=None#执行慢SQL的账号...
TIME_TO_SEC() Return the argument converted to seconds TIMEDIFF() Subtract time TIMESTAMP() With a single argument, this function returns the date or datetime expression; with two arguments, the sum of the arguments TIMESTAMPADD() Add an interval to a datetime expression TIMESTAMPDIFF(...
# 时间间隔(日期A -日期B)(忽略时间hours\minute\second,只计算日期day) select A.id from Weather as A join Weather as B where A.temperature>B.temperature and DATEDIFF(A.recordDate,B.recordDate)=1 2、DATE_SUB(日期1,INTERVAL 1 day)
DATETIME if the first argument is a DATETIME (or TIMESTAMP) value, or if the first argument is a DATE and the unit value uses HOURS, MINUTES, or SECONDS. String otherwise. To ensure that the result is DATETIME, you can use CAST() to convert the first argument to DATETIME. mysql>...
this was tested was the same, except for the MySQL versions. This was tested on AWS RDS using a size of db.t3.micro. my_table had only 39K rows, but it did have a lot of data inside JSON columns. The mysqldump of the database was 808 MB. date_created had a type of datetime....