从日期字段mysql中提取年和月

Question

How can I get year and month values only as yyyy-mm format from datetime field?

I tried

Select EXTRACT(YEAR_MONTH From task_completion) from task;

But this results in 201901 format.

Also I tried this solution from this post :

SELECT DATEADD(MONTH, DATEDIFF(MONTH, 0, task_completion), 0)
FROM task

Which gives Incorrect parameter count in the call to native function 'DATEDIFF' error, since this was solution for sql-server .

Is there any equivalent solution for mysql?

Answer 1

year and month function in mysql

select year(task_completion),month(task_completion) from task

but if you need year with month use DATE_FORMAT

 select  DATE_FORMAT(task_completion,'%Y-%m') from task

Answer 2

SELECT CONCAT(year(task_completion), '-' ,month(task_completion)) FROM task