Question

How to select week data (more precisely, last 7 days data) from the current date in the fastest way as I have millions or rows in the table. I have a time stamp of created_date in sql table.

I have tried this

SELECT Created_Date
FROM Table_Name
WHERE Created_Date >= DATEADD(day,-7, GETDATE())

I have two question:

1. Is this query is correct?
2. Is this is the fastest way to get the last seven day data from a table having millions of rows ?

Answer 1

Yes, the syntax is accurate and it should be fine.

Here is the SQL Fiddle Demo I created for your particular case

create table sample2
(
    id int primary key,
    created_date date,
    data varchar(10)
  )

insert into sample2 values (1,'2012-01-01','testing');

And here is how to select the data

SELECT Created_Date
FROM sample2
WHERE Created_Date >= DATEADD(day,-11117, GETDATE())