如何将日期数字四舍五入到SQL中最接近的月份？

Question

2015-01-28T01:45:31.000Z

I want to round the column values for date to the nearest month. Is there a way I can do that with a SELECT statement?

Answer 1

select date_format(date_field, '%Y-%m') as date_rounded

Answer 2

The statement below will round the date to the 1st of the current month if the day is less than 16, otherwise the date will be rounded to the 1st of the next month.

SELECT CASE 
         WHEN date_format(myDate, '%d') < '16' THEN
           date_format(myDate, '%Y-%m-01')
         ELSE
           date_format( DATE_ADD(myDate, INTERVAL 1 MONTH) , '%Y-%m-01')
         END as 'date_rounded'
  FROM my_table;