从日期时间字段中选择年份以及月份，然后插入日期字段

Question

I have value in field 'DateandTime' as 2015-05-12 12:04:15 and it is stored table1. I have so many values in same month.

I just want to insert it to table2 only year and month in the format '2015-05' and the field type is date and the field name is 'Date'.

How can I do this in mysql? And not in PHP.

Kindly suggest me.

Answer 1

Try this (edited, see below):

-- This query fails
-- insert into table2 values (select distinct(DATE_FORMAT(DateandTime, "%Y-%m")) as yearmonth from table1)

UPDATE:

Yes, you're right. I write the answer without executing it... Try this, please:

insert into table2 select distinct(STR_TO_DATE(DATE_FORMAT(DateandTime, "%Y-%m"), '%Y-%m')) from table1