查询根据创建日期时间的日期获取列的总和？

Question

I have a table with two columns, caloriesConsumed and createdAt with datatypes Int and DateTime respectively. I want to get the sum of the numbers entered on the same date.

SELECT SUM(caloriesConsumed), createdAt
FROM record
GROUP BY createdAt;

As createdAt is of datatype DateTime , the columns are not grouped and returns all the records. How can I group by the date and ignore the time in the column?

Answer 1

use a cast(createdAt as date) to convert the datetime to date

select sum(caloriesConsumed), cast(createdAt as date)
    from record
    group by cast(createdAt as date)

Answer 2

SELECT SUM(caloriesConsumed), createdAt  
FROM record  
GROUP BY DATE(createdAt);

here DATE() function only grabs the date and remove time from datetime