how to convert varchar value to datetime

Question

how to convert varchar value to datetime

mcfarlandparkway

SSCertifiable

Points: 7699
More actions
February 23, 2017 at 10:58 am

#335254

SELECT MAX(CASE code WHEN 'sdt' THEN convert(datetime,Cval) ELSE NULL END) as MinDate,
MAX(CASE code WHEN 'Edt' THEN convert(datetime,Cval) ELSE NULL END) as MaxDate
from table
Cval in table is varchar(20). value holds in this column is '2015034' Now I have to compare this coulm value to datetime valve for that in the query how Cval column will be converted to datetime?

Viewing 4 posts - 1 through 3 (of 3 total)

You must be logged in to reply to this topic. Login to reply

Phil Parkin SSC Guru Points: 246712 More actions · Answer 1

mcfarlandparkway - Thursday, February 23, 2017 10:58 AM
SELECT MAX(CASE code WHEN 'sdt' THEN convert(datetime,Cval) ELSE NULL END) as MinDate,
MAX(CASE code WHEN 'Edt' THEN convert(datetime,Cval) ELSE NULL END) as MaxDate
from table
Cval in table is varchar(20). value holds in this column is '2015034' Now I have to compare this coulm value to datetime valve for that in the query how Cval column will be converted to datetime?

If I had to convert 2015034 to a date, I wouldn't have a clue how to do it. Can you explain?

If you haven't even tried to resolve your issue, please don't expect the hard-working volunteers here to waste their time providing links to answers which you could easily have found yourself.

ScottPletcher SSC Guru Points: 100949 More actions · Answer 2

My best guess is that the value is a pseudo-"Julian" date (as IBM called it), i.e., that the last 3 digits are the relative day number of the year.

IF that's true, you can do this:

SELECT DATEADD(DAY, CAST(RIGHT(Cval, 3) AS int) - 1, LEFT(Cval, 4) + '0101') AS final_date FROM ( VALUES('2015034') ) AS test_data(Cval)

SQL DBA,SQL Server MVP(07, 08, 09) A socialist is someone who will give you the shirt off *someone else's* back.

Jeff Moden SSC Guru Points: 1003873 More actions · Answer 3

Phil Parkin - Thursday, February 23, 2017 11:10 AM
mcfarlandparkway - Thursday, February 23, 2017 10:58 AM
SELECT MAX(CASE code WHEN 'sdt' THEN convert(datetime,Cval) ELSE NULL END) as MinDate,
MAX(CASE code WHEN 'Edt' THEN convert(datetime,Cval) ELSE NULL END) as MaxDate
from table
Cval in table is varchar(20). value holds in this column is '2015034' Now I have to compare this coulm value to datetime valve for that in the query how Cval column will be converted to datetime?
If I had to convert 2015034 to a date, I wouldn't have a clue how to do it. Can you explain?

Wonder if its a year and some form of Julian date, possibly where 034 is representing the day of the year.

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)