mysql timestamp

The Default value of timestamp is Default CURRENT_TIMESTAMP.The timestamp is set to automatically update on update CURRENT_TIMESTAMP as the table changes.HoweverA table can have at most one field set CURRENT_TIMESTAMPYou cannot set DEFAULT CURRENT_TIMESTAMP in the two rows.Note thatCopy codeThe Code is as follows:Create table 'device '('Id' INT (10) unsigned not null AUTO_INCREMENT,'Toid' INT (10) unsigned

MySQL timestamp type and Time Zone instance details, mysqltimestamp MySQL timestamp type and Time Zone Timestamp type time range of MySQL: between '2017-01-01 00:00:01 'and '2017-01-19 03:14:07 ', if the value exceeds this range,

MySQL date type DATETIME and TIMESTAMPThere are three types of dates in MySQL5: DATETIME, DATE, and TIMESTAMP, except that DATE is used to indicate a DATE without time and second, and the other two have time and second. TIMESTAMP can also be accurate to milliseconds. There is also a commonality, that is, their format is "not strict", very free, you generally thin

Tags: php mysql timestampThere are three types of time fields in MySQL:Datetime,date and timestamp.DateTime holds the data in YYYY-MM-DD HH:MM:SS format string;Date is a string of yyyy-mm-dd in the form of only a month and a day;The timestamp type has the same name as the timestamp type in PHP, but the two are basically different.PHP is the type of Unix time sign

When designing a MYSQL table, two TIMESTAMP fields are required. Sometimes, a database table requires a record creation time and a record modification time. The ideal design is as follows: the initial value of the update time is the same as the Creation time: CREATETABLE 'test _ table' ('id' INT (10) NOTNULL, 'create _ time' TIMEST When designing a MYSQL table, t

the month and the week, and other methods of obtainingSelect TIMESTAMP(' 2010-03-03 16:41:16 ');SelectDATE (' 2010-03-03 16:41:16 ');Select Year(' 2010-03-03 16:41:16 ');Select MONTH(' 2010-03-03 16:41:16 ');Select Day(' 2010-03-03 16:41:16 ');SelectTime (' 2010-03-03 16:41:16 ');SelectCurtime ();SelectCurdate ();Select current_date;Select Current_time;Select Current_timestamp; A lot of ways, here is a simple list of one or two.Vi. arithmetic opera

');Select DATE (' 2013-01-29 13:50:27 ');Select year (' 2013-01-29 13:50:27 ');Select MONTH (' 2013-01-29 13:50:27 ');Select WEEK (' 2013-01-29 13:50:27 ');Select Day (' 2013-01-29 13:50:27 ');Select time (' 2013-01-29 13:50:27 ');Select Curtime ();Select Curdate ();Select Current_date;Select Current_time;Select Current_timestamp;Select Now ()Vi. operation of the date:SELECT date_add (' 2013-01-29 13:50:27 ', INTERVAL 1 day);' 2013-01-30 13:50:27 'SELECT date_add (' 2013-01-29 13:50:27 ', INTER

MySQL table name and other case sensitive issues: http://blog.csdn.net/postnull/article/details/72455768;1 MySQL under Linux database name, table name, column name, alias casing rules are like this: 2 1 , database name and table name are strictly case-sensitive; 3 2 , the alias of the table is strictly case-sensitive; 4 3 , the name of the column and the alias of the column are ignored in all cases; 5 4,

DATETIME: A combination of date and time. The supported range is '2017-01-01 00:00:00 'to '2017-12-31 23:59:59 '. MySQL displays DATETIME values in 'yyyy-MM-DD HH: MM: ss' format, but allows values to be assigned to DATETIME columns using strings or numbers.TIMESTAMP [(M)]: TIMESTAMP. The range is '2017-01-01 00:00:00 'to July 22, 1970.The TIMESTAMP column is use

Tags: c a int class for TIME1. MySQL Gets the current timestamp function: Current_timestamp, Current_timestamp ()mysql> Select Current_timestamp, Current_timestamp ();+---------------------+---------------------+| current_timestamp | current_timestamp () |+---------------------+---------------------+| 2008-08-09 23:22:24 | 2008-08-09 23:22:24 |+------------------

Many times, in order to be simple, we need to set the Time field to the current time when designing the datasheet. In MySQL, however, the default value cannot be used, that is, you cannot set a column, and the default value is now (). What about it? TIMESTAMP data type. When inserting, ignore the column. The code is as follows Copy Code DT

Label:1.unix_timestamp Converts a time into a timestamp. (date type data converted to timestamp form integer) Time stamp of the current time without passing the time parameter Mysql> select Unix_timestamp ();+------------------+| Unix_timestamp () |+------------------+| 1361586358 |+------------------+1 row in Set (0.01 sec)

In the MySQL database, the timestamp data type is a special data type that automatically updates the time as soon as the record is updated without using program updates timestamp.There is usually a field in the table where create date is created, and other databases have the option of default values. MySQL also has a default value of

Programmers who have written php+mysql know that there is a time lag, Unix timestamps and formatted dates are two time representations that we often deal with, Unix timestamp storage, easy processing, but not intuitive, formatted date intuitive, but not as easy to handle as the Unix timestamp, So sometimes it's necessary to convert each other, and here are some w

Label:MySQL date syntax faq:how do I set a MySQL date field to default to ' now ', i.e.Setting the date to ' now 'Unfortunately you can ' t default a MySQL DATE field to "Now", but can get the "now" behavior with a MySQL TIMESTAMP fie Ld. The syntax to create a MySQL

MySQL upgrades from 5.5 to 5.6, and changes in TIMESTAMPPreface Some time ago, the system MySQL was upgraded from 5.5 to 5.6, and a large number of exceptions occurred. Most of the exceptions are caused by changes in TIMESTAMP behavior.The behavior of TIMESTAMP in MySQL5.5 is the first implicit default value for the

In mysql, there are many time and date functions that I commonly use: datetime and timestamp. Although they are all called date periods, they are still different in terms of expression and range, next I will introduce it. Comparison Storage TIMESTAMP Storage of 1.4 bytes (Time stamp value is stored in 4 bytes) 2. Save the value in UTC format (it stores the number

Usually more commonly used time, string, time stamp between the conversion, although commonly used but almost every time you like to search for usage; This article will take a note of the conversion between the three (that is: date to string, date to timestamp, string to date, string to timestamp, Timestamp to date, timestamp