Solved

SQL Date Query

Posted on 2016-11-03
9
65 Views
Last Modified: 2016-11-22
I have a column that is data type varchar(6).

The column contains data like YYYYMM. Example 201610 for October2016.

I would like to be able to handle the data in this column like if it was a date without the days, so I could do a query like:

Select revenue
From Invoices
Where InvoiceDate > '201601'
0
Comment
Question by:isames
  • 2
  • 2
  • 2
  • +2
9 Comments
 
LVL 28

Expert Comment

by:Pawan Kumar
ID: 41872534
Try....

1...

DECLARE @dt AS DATETIME = '2016/01/01'
Select revenue
From Invoices
Where CAST( LEFT(InvoiceDate ,4)  + '/' + RIGHT(InvoiceDate ,2) + '/' + '01' AS DATETIME ) > @dt

or Try 2 ..

DECLARE @Date AS VARCHAR(6) = '201610'
SELECT CAST( LEFT(@Date,4)  + '/' + RIGHT(@Date,2) + '/' + '01' AS DATETIME )

Select revenue
From Invoices
Where InvoiceDate > CAST( LEFT(@Date,4)  + '/' + RIGHT(@Date,2) + '/' + '01' AS DATETIME )

Hope it helps ..
0
 
LVL 52

Expert Comment

by:_agx_
ID: 41872578
@isames - What happened when you tried it? I think it should work as expected, as long as the month number is always zero padded.  If not, try casting the underlying column to a date, using a static '01' for the day value:

    WHERE CONVERT(date, InvoiceDate, '01', 112) > CONVERT(date, '20160101', 112)

However, that will prevent the db from using any indexes on that column. So if possible, it would be better to convert InvoiceDate to type date or date/time.
0
 
LVL 65

Expert Comment

by:Jim Horn
ID: 41872665
>I would like to be able to handle the data in this column like if it was a date without the days,
There is no such animal, as you'd always have to parse the value to add the first day of the month, then convert to a date.   And you'd have to do that in every query.

A vastly better idea would be to create your own calendar table where the YYYYMM and the date are columns.  Check out SQL Server Calendar Table which has code ready-to-execute to pull that off.

That way, it's a simple JOIN on your calendar table, YYYYMM value, then grab the date.
0
Efficient way to get backups off site to Azure

This user guide provides instructions on how to deploy and configure both a StoneFly Scale Out NAS Enterprise Cloud Drive virtual machine and Veeam Cloud Connect in the Microsoft Azure Cloud.

 
LVL 77

Accepted Solution

by:
slightwv (䄆 Netminder) earned 500 total points (awarded by participants)
ID: 41872886
>>so I could do a query like:

Why do you think you need to convert it to a date first?

That seems like a perfectly valid query that will pull in everything from January 2016 to present.

Say today is February 4, 2017 and you want all of 2016:

Select revenue  From Invoices  Where InvoiceDate like '2016%'
or
Select revenue  From Invoices  Where InvoiceDate >= '201601' and InvoiceDate < '2017'
0
 
LVL 48

Expert Comment

by:PortletPaul
ID: 41873131
Select revenue  From Invoices  
Where InvoiceDate > '201601' and InvoiceDate < '201700'

you would need '00' or '01' in that I believe

Think of it as being an integer

     201602 is not less than 2017

    201602 is less than 201700
0
 
LVL 77

Expert Comment

by:slightwv (䄆 Netminder)
ID: 41873149
>>Think of it as being an integer

No need.  In the original post:  "I have a column that is data type varchar(6)."

It is a string compare.  ASCII sorting doesn't need the '00'.
0
 
LVL 48

Expert Comment

by:PortletPaul
ID: 41873166
:( sorry yes you are correct

I was going to mention making it an integer as an alternative but had to do  stand-up....
0
 
LVL 28

Expert Comment

by:Pawan Kumar
ID: 41873259
Hi isames,
Did you tried out the suggestions ?

Regards,
Pawan
0

Featured Post

What is SQL Server and how does it work?

The purpose of this paper is to provide you background on SQL Server. It’s your self-study guide for learning fundamentals. It includes both the history of SQL and its technical basics. Concepts and definitions will form the solid foundation of your future DBA expertise.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

If you have heard of RFC822 date formats, they can be quite a challenge in SQL Server. RFC822 is an Internet standard format for email message headers, including all dates within those headers. The RFC822 protocols are available in detail at:   ht…
This article explains how to reset the password of the sa account on a Microsoft SQL Server.  The steps in this article work in SQL 2005, 2008, 2008 R2, 2012, 2014 and 2016.
Email security requires an ever evolving service that stays up to date with counter-evolving threats. The Email Laundry perform Research and Development to ensure their email security service evolves faster than cyber criminals. We apply our Threat…

713 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question