mysql datetime functions

This content is transferred from a Sina blog article later I will optimize the content Http://blog.sina.com.cn/s/blog_6d39dc6f0100m7eo.html In addition to the now () function to get the current datetime, MySQL has the following function:

ASCII (str) returns the ASCII value of the first character of the string str (0 if str is an empty string) mysqlgt; selectASCII ( ASCII (str) returns the ASCII value of the first character of the string str (0 if str is an empty string) mysqlgt;

ASCII (str)Returns the ASCII value of the first character of the string 'str' (0 is returned when 'str' is an empty string)Mysql> selectASCII ('2 ');-> 50Mysql> select ASCII (2 );->50Mysql> select ASCII ('dete ');-> 100ORD (str)If the string 'str'

MySQL timestampdiff () functions are much more powerful than datediff () functions. datediff () can only calculate the number of days for the difference between two dates. Mysql common date addition and subtraction functions and instance

MySQL: Summary of date functions and time functions bitsCN.com Published inWww.sqlstudy.com1. MySQL obtains the current date and time function 1.1 obtain the current date + time (date + time) function: now () mysql> select now();+-------------------

MySQL obtains the function Summary of the current date and time. For more information, see. MySQL obtains the function Summary of the current date and time. For more information, see. 1.1 obtain the current date + time (date + time) function: now ()

Original: http://www.51sdj.com/phpcms/picture/2009/0711/picture_133.htmlFirst, MySQL gets the current date time function1.1 Get the current date + time (date + times) function: Now ()Mysql> Select Now ();+---------------------+| Now () |+------------

Introduction to timestamp basic knowledge Variant of the timestamp1,timestamp DEFAULT current_timestamp on UPDATE current_timestamp refreshes this data column when new records are created and existing records are modified 2,timestamp default

1. MySQL obtains the current date and time function1.1 obtain the current date + time (date + time) function: now ()Mysql> select now (); + --------------------- +| Now () |+ --------------------- +| 22:20:46 |+ --------------------- + In addition

The following query Selects all records. The value of date_col is within the last 30 days: Mysql> SELECT something FROM tableWHERE TO_DAYS (NOW ()-TO_DAYS (date_col) DAYOFWEEK (date)Returns the index of the week of the date (1 = Sunday, 2 = Monday ,