mysql 查詢某一天數據

某個場景下需要查詢某一天的數據，例如2017/9/27這一天所有的數據量，有以下幾個方法。

SELECT * FROM cms_book_statistics WHERE substring(Convert(char(10),update_time ,112),1,8)='20170927' 

SELECT * FROM cms_book_statistics WHERE update_time between '2017-09-27 00:00:00' and '2017-09-27 23:59:59' 

SELECT * FROM cms_book_statistics WHERE year(update_time ) = 2017 and month(update_time )= 09 and day(update_time ) = 27

SELECT * FROM cms_book_statistics WHERE update_time > '2017-09-27' and update_time < '2017-09-28'

SELECT * FROM cms_book_statistics WHERE ( datediff ( update_time , '2017-09-27' ) = 0 )