interval 1 day

The following query Selects all records whose date_col values are within the last 30 days. Mysql> SELECT something FROM tbl_nameWHERE TO_DAYS (NOW ()-TO_DAYS (date_col) DAYOFWEEK (date)Returns the week index of date (1 = Sunday, 2 = Monday,... 7 =

Detailed description of mysql to obtain the current date and format, detailed description of mysql current date MySQL obtains the current date and Date Format Get system date: NOW () Format date: DATE_FORMAT (date, format) Note: date: Time

1.1 obtain the current date + time (date + time) function: now () Mysql> select now (); + --------------------- +| Now () |+ --------------------- +| 22:20:46 |+ --------------------- +In addition to the now () function, MySQL also has the

Here is an example of using the date function. The following query Selects all records whose date_col values are within the last 30 days. Here is an example of using the date function. The following query Selects all records whose date_col values

MySQL returns the current date and time function summary bitsCN. com1.1 returns the current date + time (date + time) function: now () Mysql> select now (); + --------------------- + | Now () | + --------------------- + | 22:20:46 | + -------------

first, the use of Sqoop data extraction1. Sqoop IntroductionSqoop is a tool for efficiently transferring large volumes of data between Hadoop and structured data storage, such as relational databases. It was successfully hatched in March 2012 and is

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();+-------------------

Optimization of mysql query date by time, mysql Time query date For example, to query newly registered users yesterday, the statement is as follows: EXPLAINselect * from chess_user u where DATE_FORMAT (u. register_time, '% Y-% m-% D') = '2017-01-25

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

To create a table: Copy Code code as follows: CREATE table if not exists t ( ID int, Addtime datetime default ' 0000-00-00 00:00:00′ ) Add two initial data: Insert T VALUES (1, ' 2012-07-12 21:00:00′);Insert T

Date_add (date, INTERVAL expr type) date_sub (date, INTERVAL expr type ) These functions perform date operations. Date is a DATETIME or date value that specifies the starting time.  expr is an expression that specifies the value of a time

For example, to query the new registered users yesterday, the following two types of writing:EXPLAINSelect * fromChess_user uwhereDate_format (U.register_time,'%y-%m-%d')='2018-01-25'; EXPLAINSelect * fromChess_user uwhereU.register_timebetween '20

Partition functionCREATE definer= ' root ' @ '% ' FUNCTION ' query_str ' () RETURNS varchar (+) CHARSET UTF8BEGINDECLARE start_date date DEFAULT ' 2018-05-17 ';DECLARE res_str varchar (+) DEFAULT ';While start_dateSet res_str = Concat (res_str, '

First, MySQL gets the current date time function1.1 Get the current date + time (date + times) function: Now ()Mysql> Select Now (); +---------------------+| Now () |+---------------------+| 2015-01-22 22:20:46

First, MySQL gets the current date time function 1.1 Get the current date + time (date + times) function: Now () Mysql> Select Now (); +---------------------+ | Now () | +---------------------+ | 2008-08-08 22:20:46 | +---------------------+ In

Original link:MySQL time and date function-Redfox-Blog ParkHttp://www.cnblogs.com/redfox241/archive/2009/07/23/1529092.html--------------------------------------------------------------------------------------------------------------- ---------------

To create a table:The code is as follows:CREATE table if not exists t(ID int,Addtime datetime default ' 0000-00-00 00:00:00′)Add two initial data:Insert T VALUES (1, ' 2012-07-12 21:00:00′);Insert T VALUES (2, ' 2012-07-22 21:00:00′);Data inserted

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 () |+------------

MYSQL gets the current date and date formatGet system Date: Now ()Formatted Date: date_format (date, format)Note: Date: Time fieldFormat: Date formatsReturns the system date, output 2009-12-25 14:38:59Select Now ();Output 09-12-25Select Date_format (

MYSQL gets the current date and date formatGet system Date: Now ()Formatted Date: date_format (date, format)Note: Date: Time fieldFormat: Date formatsReturns the system date, output 2009-12-25 14:38:59Select Now ();Output 09-12-25Select Date_format (