MySql by week, month, quarter, year inquiry

Reference links: https://blog.csdn.net/snihcel/article/details/80088195 (Reference)

                     https://www.runoob.com/mysql/mysql-functions.html (a function MySql)

                    https://blog.csdn.net/dxhtostage/article/details/82792789 (Mysql in the count () using the syntax)

                   https://www.cnblogs.com/yueguanguanyun/p/7911448.html (report query)

First, the annual query (query data year)

SELECT * FROM tableName  
WHERE year(tableName.timer) = year(curdate( ))；

Where: 1.year (...) returns the year

SELECT YEAR("2017-06-15");
-> 2017

2.curdate () returns the current date

SELECT CURDATE();
-> 2018-09-19

3.now () returns the current date and time

SELECT NOW()
-> 2019-11-11 20:20:00

Note: tableName is the table name, timer date type of field. year () is used to calculate annual date, curdate () indicates the current time

Second, the inquiry quarterly data

SELECT *  
FROM tableName  
WHERE quarter(tableName.timer) = quarter(curdate( )); 

Wherein: quarter () Returns the date d is the first of several seasons, return 1-4

SELECT QUARTER('2011-11-11 11:11:11')
-> 4

Third, the monthly data query

select * from tableName where month(tableName.timer)=  
month(curdate());

Wherein: month () Returns the month of the date d, 1-12

SELECT MONTH('2011-11-11 11:11:11')
->11