Mysql query data day yesterday, nearly seven days a week, this month, last month, etc. (the date of execution of arithmetic functions)

Note: The field where the statement last_login_time field names can be replaced with time

# Inquiry yesterday logged-on user account
 the SELECT Mobile, last_login_time from the User the WHERE TO_DAYS (the NOW ()) - TO_DAYS (last_login_time) = 1 ; # queries that day to log the user's account


 the SELECT Mobile, last_login_time from the User the WHERE TO_DAYS (the NOW ()) - TO_DAYS (last_login_time) < 1 ;
 
# Search last_login_time value in the last days of recording
 the SELECT Mobile, last_login_time from the user the WHERE TO_DAYS (the NOW ()) - TO_DAYS (last_login_time) <= 1 ;
 
# inquiry last seven days of the logged in user account
 the SELECT Mobile , last_login_time from the User the WHERE DATE_SUB (CURDATE (), INTERVAL2 DAY) < DATE (last_login_time); 
* explain: INTERVAL 1 DAY, interpreted as the time interval to one day 

to log the user in the # queries one week account
 the SELECT Mobile, last_login_time from the User the WHERE last_login_time the BETWEEN CURRENT_DATE () - 7 and sysdate (); # queries logged-in user's account this month


 the SELECT Mobile, last_login_time from the user the WHERE the DATE_FORMAT (last_login_time, ' % the Y-% M ' ) = the DATE_FORMAT (CURDATE (), ' % the Y-% M ' ); # queries on January Log In Username


 the SELECT Mobile, last_login_time from the user the WHEREPERIOD_DIFF (DATE_FORMAT (now (), ' % the Y% m ' ), DATE_FORMAT (last_login_time, ' % the Y% m ' )) = . 1 ; 

Note: If the database time is a UNIX timestamp stored in the form of words, comparison of the time need to be changed to a uniform format; 
for DATE_SUB () returns the formatted time: 2019-10-29 
required UNIX_TIMESTAMP () conversion UNIX timestamp comparison form:

 code is as follows: 
WHERE inputtime> UNIX_TIMESTAMP (for DATE_SUB (CURDATE (), the INTERVAL. 1 DAY))

 

(. 1 ) WEEKDAY (date)
 
　　action: Returns the index date of the week ( 0 = catalog on Monday, . 1 = on Tuesday, ... . 6 = the Sunday) 

 　　 the SELECT WEEKDAY ( ' 1997 - . 11 - 05 ');
　　　 return: -> 2  

(2 ) DAYOFMONTH (date) 

　　action: returns the date is the first day of the month, the range of 1 to 31 is: 

　　MySQL> DAYOFMONTH the SELECT ( '1998-02-03'); 
　　return result: ->. 3 

(. 3) DAYOFYEAR (date )

　　action: returns the date is the first day of the year, the range 1 to 366: 

　　MySQL> DAYOFYEAR the SELECT ( '1998-02-03'); 
　　return result: -> 34 is 

(. 4) DAYNAME (date)

　　Role: Return date weekday name:

　　mysql> SELECT DAYNAME("1998-02-05");
　　-> ’Thursday’

　（5）MONTHNAME(date)

　　Role: Return date month name:

　　mysql> SELECT MONTHNAME("1998-02-05");
　　-> ’February’

　（6）QUARTER(date)

　　作用：返回 date 在一年中的季度，范围为 1 到 4：

　　mysql> SELECT QUARTER(’98-04-01’);
　　-> 2