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SQL get all dates beginning with 2

Posted on 2015-02-03
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Last Modified: 2015-02-06
Hi

I use the following SQL statement to get all decimal values beginning with 2

Select * From MARA_MBEW Where SUBSTRING(CAST([Total Stock] AS VARCHAR),1, 1) = 2

I try to do the same thing with a date column using the following statement but it doesn't seem to work

Select * From MARA_MBEW Where SUBSTRING(CAST([MyDate] AS VARCHAR),1, 1) = 2
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Question by:Murray Brown
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6 Comments
 
LVL 66

Accepted Solution

by:
Jim Horn earned 125 total points
ID: 40586309
Does 'by beginning with 2' mean after 1999-12-31 and before 3000-01-01?

Select * From MARA_MBEW Where MyDate > '19991231' AND MyDate < '30000101'
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LVL 24

Assisted Solution

by:Phillip Burton
Phillip Burton earned 125 total points
ID: 40586314
If [MyDate] is a date column (i.e. in datetime or something similar), then:

If you are looking for a Day starting with "2" then use:

Select * From MARA_MBEW Where Day([MyDate]) Between 20 and 29

(assuming "2" is the start of a 2-digit number, and does not include the day "02").

You can also use Month() and Year() for similar criteria.
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LVL 50

Assisted Solution

by:Vitor Montalvão
Vitor Montalvão earned 125 total points
ID: 40586381
Good point Jim. But if it's a datetime column then he can use the YEAR function:
Select * From MARA_MBEW Where YEAR([MyDate]) >= 2000 

Open in new window

I wouldn't mind with year 3000 and further :)
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LVL 66

Expert Comment

by:Jim Horn
ID: 40586394
Indeed.  We can use an asker clarification on what 'date beginning with 2' means.
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LVL 69

Assisted Solution

by:Scott Pletcher
Scott Pletcher earned 125 total points
ID: 40586462
You should avoid using functions on columns as that prevents index seeks (in technical terms, it's not "sargable").

Thus:

Select * From MARA_MBEW
Where [Total Stock] Like '2%'

Or, as Jim noted:
Where MyDate >= '20000101' AND MyDate < '30000101'

I personally prefer to stick to a >= and < format, because if time is included it makes it much easier, for example, on or after 8PM on the first of the month thru the end of the month:
Where MyDate >= '20150101 20:00' And MyDate < '20150201'
Trying to write that using > is very tricky, and depends on the specific data type of MyDate.
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Author Closing Comment

by:Murray Brown
ID: 40593098
Thanks a lot for the help. As it turns out the idea I had had no direction, but thanks for the help
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