CONCATINATE 3 COLUMNS (int) INTO A WORKABLE DATE FORMAT

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CONCATINATE 3 COLUMNS (int) INTO A WORKABLE DATE FORMAT

LoosinMaMind

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Points: 3366
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September 12, 2012 at 1:00 pm

#266559

Hi
I have been given a new system to work on and the dates are held in three seperate columns
day number ;ie 1,2,3,4 etc
month number ; ie 9,10,11 etc
year; 2011, 2012 etc
The format of these is an INT
I need to somehow concatinate the 3 into a workable date format in a SELECT statement
Any help would be greatly appreciated.
Thanks in advance
SAMPLE DATA AND EXPECTED RESULTS SCRIPT BELOW.
CREATE TABLE PS_TestForOnline
(
DAY_ INT,
MONTH_ INT,
YEAR_ INT
);
INSERT INTO PS_TestForOnline
VALUES(1,1,2012);
INSERT INTO PS_TestForOnline
VALUES(1,2,2012);
INSERT INTO PS_TestForOnline
VALUES(1,3,2012);
SELECT * FROM PS_TestForOnline
--&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
--EXPECTED RESULTS
SELECT
'1-1-2012' DATE_EXAMPLE_1, '1-2-2012' DATE_EXAMPLE_2, '1-3-2012' DATE_EXAMPLE_3 -- NEED THESE TO BE IN DATE FORMAT DD-MM-YYYY
--&&&&&&&&&&&&&&&&&&&&&&
DROP TABLE PS_TestForOnline

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Lowell SSC Guru Points: 323518 More actions · Answer 1

personally, since you have integers, i'd stick with using the dATEADD() functions:

/*

2012-02-01 00:00:00.000

2012-03-01 00:00:00.000

2012-04-01 00:00:00.000

*/

CREATE TABLE PS_TestForOnline

(

DAY_ INT,

MONTH_ INT,

YEAR_ INT

);

INSERT INTO PS_TestForOnline

VALUES(1,1,2012);

INSERT INTO PS_TestForOnline

VALUES(1,2,2012);

INSERT INTO PS_TestForOnline

VALUES(1,3,2012);

SELECT DATEADD(dd,DAY_ -1,

DATEADD(mm,MONTH_ -1,

DATEADD(yy,(YEAR_ - 1900) ,0))),

* FROM PS_TestForOnline

Lowell

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Lynn Pettis SSC Guru Points: 442467 More actions · Answer 2

Easy.

CREATE TABLE PS_TestForOnline

(

DAYNBR INT,

MONTHNBR INT,

YEARNBR INT

);

INSERT INTO PS_TestForOnline

VALUES(1,1,2012);

INSERT INTO PS_TestForOnline

VALUES(1,2,2012);

INSERT INTO PS_TestForOnline

VALUES(1,3,2012);

SELECT *, right('0' + cast(DAYNBR as varchar), 2) + '-' + right('0' + cast(MONTHNBR as varchar), 2) + '-' + cast(YEARNBR as varchar) FROM PS_TestForOnline

Lynn Pettis SSC Guru Points: 442467 More actions · Answer 3

Lowell is right, though as you should use the DATE data type, not a character string, especially if you are comparing or storing dates.

LoosinMaMind Hall of Fame Points: 3366 More actions · Answer 4

Cool !!!

That the sort of thing i need as it going into a Business Intelligence system where users have to query aginst dates.

However, your dates come out as the 2nd of each month, ????

i would expect my results to be ......

INSERT INTO PS_TestForOnline

VALUES(1,1,2012); 2012-01-01 00:00:00.000

INSERT INTO PS_TestForOnline

VALUES(1,2,2012); 2012-02-01 00:00:00.000

INSERT INTO PS_TestForOnline

VALUES(1,3,2012); 2012-03-01 00:00:00.000

Thanks in advance

PS: just out of interest, why the -1900??

Lynn Pettis SSC Guru Points: 442467 More actions · Answer 5

LoosinMaMind (9/12/2012)
Cool !!!
That the sort of thing i need as it going into a Business Intelligence system where users have to query aginst dates.
However, your dates come out as the 2nd of each month, ????
i would expect my results to be ......
INSERT INTO PS_TestForOnline
VALUES(1,1,2012); 2012-01-01 00:00:00.000
INSERT INTO PS_TestForOnline
VALUES(1,2,2012); 2012-02-01 00:00:00.000
INSERT INTO PS_TestForOnline
VALUES(1,3,2012); 2012-03-01 00:00:00.000
Thanks in advance
PS: just out of interest, why the -1900??

Not sure what you are talking about with regard to the 2nd of each month, both solutions return the first of each month.

As for the - 1900, run this:

select dateadd(yy, 2012 - 1900, 0) -- should return 2012-01-01 00:00:00.000

Possinator Hall of Fame Points: 3422 More actions · Answer 6

Lowell (9/12/2012)
personally, since you have integers, i'd stick with using the dATEADD() functions:
/*
2012-02-01 00:00:00.000
2012-03-01 00:00:00.000
2012-04-01 00:00:00.000
*/
CREATE TABLE PS_TestForOnline
(
DAY_ INT,
MONTH_ INT,
YEAR_ INT
);
INSERT INTO PS_TestForOnline
VALUES(1,1,2012);
INSERT INTO PS_TestForOnline
VALUES(1,2,2012);
INSERT INTO PS_TestForOnline
VALUES(1,3,2012);
SELECT DATEADD(dd,DAY_ -1,
DATEADD(mm,MONTH_ -1,
DATEADD(yy,(YEAR_ - 1900) ,0))),
* FROM PS_TestForOnline

Hi Lowell - yours is adding 1 to the month and day since the year is already 01-01:

(No column name)DAY_MONTH_YEAR_

2012-02-02 00:00:00.000112012

2012-03-02 00:00:00.000122012

2012-04-02 00:00:00.000132012

You could subtract the extract day:

SELECT DATEADD(dd,DAY_ - 1, DATEADD(mm,MONTH_ - 1, DATEADD(yy,(YEAR_ - 1900) ,0)))

FROM #PS_TestForOnline

or use a string concat:

select cast(convert (char(4), p.YEAR_)

+ '-' + convert(char(2), p.MONTH_) + '-'

+ convert(char(2),p.DAY_) as date)

from PS_TestForOnline p

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Lynn Pettis SSC Guru Points: 442467 More actions · Answer 7

A little more information. The date '1900-01-01 00:00:00.000' is sometimes referred to as the 0 (zero) date. If you run select cast(0 as datetime) you will return '1900-01-01'. Knowing this helps wih completing a variety date calculations. To see some, go here:

http://www.sqlservercentral.com/blogs/lynnpettis/2009/03/25/some-common-date-routines/

Lynn Pettis SSC Guru Points: 442467 More actions · Answer 8

Possinator (9/12/2012)
Lowell (9/12/2012)
personally, since you have integers, i'd stick with using the dATEADD() functions:
/*
2012-02-01 00:00:00.000
2012-03-01 00:00:00.000
2012-04-01 00:00:00.000
*/
CREATE TABLE PS_TestForOnline
(
DAY_ INT,
MONTH_ INT,
YEAR_ INT
);
INSERT INTO PS_TestForOnline
VALUES(1,1,2012);
INSERT INTO PS_TestForOnline
VALUES(1,2,2012);
INSERT INTO PS_TestForOnline
VALUES(1,3,2012);
SELECT DATEADD(dd,DAY_ -1,
DATEADD(mm,MONTH_ -1,
DATEADD(yy,(YEAR_ - 1900) ,0))),
* FROM PS_TestForOnline
Hi Lowell - yours is adding 1 to the month and day since the year is already 01-01:
(No column name)DAY_MONTH_YEAR_
2012-02-02 00:00:00.000112012
2012-03-02 00:00:00.000122012
2012-04-02 00:00:00.000132012
You could subtract the extract day:
SELECT DATEADD(dd,DAY_ - 1, DATEADD(mm,MONTH_ - 1, DATEADD(yy,(YEAR_ - 1900) ,0)))
FROM #PS_TestForOnline
or use a string concat:
select cast(convert (char(4), p.YEAR_) + '-' + convert(char(2), p.MONTH_) + '-' + convert(char(2),p.DAY_) as date)
from PS_TestForOnline p

Actually, it isn't. Take a closer look, it is actually subtracting 1 for the day or month entered in the table.

LoosinMaMind Hall of Fame Points: 3366 More actions · Answer 9

Thanks Chaps, thats done the trick.

Love this site so much.

As long as you supply sample data and expected reults. (iI've learnt in the past :-))

Thanks again

Possinator Hall of Fame Points: 3422 More actions · Answer 10

Actually, it isn't. Take a closer look, it is actually subtracting 1 for the day or month entered in the table.

I'm just too slow. Should have checked the post again. 'twas edited whilst I typed. 😀

Thanks!

[font="Courier New"]Looking for a Deadlock Victim Support Group..[/font]

Jeff Moden SSC Guru Points: 1004406 More actions · Answer 11

LoosinMaMind (9/12/2012)
Hi
I have been given a new system to work on and the dates are held in three seperate columns
day number ;ie 1,2,3,4 etc
month number ; ie 9,10,11 etc
year; 2011, 2012 etc
The format of these is an INT
I need to somehow concatinate the 3 into a workable date format in a SELECT statement
Any help would be greatly appreciated.
Thanks in advance
SAMPLE DATA AND EXPECTED RESULTS SCRIPT BELOW.
CREATE TABLE PS_TestForOnline
(
DAY_ INT,
MONTH_ INT,
YEAR_ INT
);
INSERT INTO PS_TestForOnline
VALUES(1,1,2012);
INSERT INTO PS_TestForOnline
VALUES(1,2,2012);
INSERT INTO PS_TestForOnline
VALUES(1,3,2012);
SELECT * FROM PS_TestForOnline
--&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
--EXPECTED RESULTS
SELECT
'1-1-2012' DATE_EXAMPLE_1, '1-2-2012' DATE_EXAMPLE_2, '1-3-2012' DATE_EXAMPLE_3 -- NEED THESE TO BE IN DATE FORMAT DD-MM-YYYY
--&&&&&&&&&&&&&&&&&&&&&&
DROP TABLE PS_TestForOnline

If you wanted to make it so you could query the table directly instead of having code do it over and over again, add a persisted computed column to the table to do the calculation that Lowel posted. Just pray people named their columns for inserts or BOOM!

--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:
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How to Post Performance Problems
Create a Tally Function (fnTally)

Michael Valentine Jones SSC Guru Points: 64818 More actions · Answer 12

I think this code is about as short as it gets to do this:

select

[DD-MM-YYYY] =

convert(varchar(10),dateadd(mm,(12*YEAR_)-22801+MONTH_,DAY_-1),105),

[Date]=dateadd(mm,(12*YEAR_)-22801+MONTH_,DAY_-1),

a.*

from

PS_TestForOnline a

Results:

DD-MM-YYYY Date DAY_ MONTH_ YEAR_

---------- ----------------------- ----------- ----------- -----------

01-01-2012 2012-01-01 00:00:00.000 1 1 2012

01-02-2012 2012-02-01 00:00:00.000 1 2 2012

01-03-2012 2012-03-01 00:00:00.000 1 3 2012

(3 row(s) affected)

More info on this subject in this link:

http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=22339

Dwain Camps SSC Guru Points: 86978 More actions · Answer 13

This is pretty short too but subject to the DATEFORMAT setting (I think):

SELECT DAY_, MONTH_, YEAR_

,CAST(RTRIM(MONTH_) + '-' + RTRIM(DAY_) + '-' + RTRIM(YEAR_) AS DATETIME)

FROM PS_TestForOnline

My mantra: No loops! No CURSORs! No RBAR! Hoo-uh![/I]
My thought question: Have you ever been told that your query runs too fast?

My advice:
INDEXing a poor-performing query is like putting sugar on cat food. Yeah, it probably tastes better but are you sure you want to eat it?
The path of least resistance can be a slippery slope. Take care that fixing your fixes of fixes doesn't snowball and end up costing you more than fixing the root cause would have in the first place.

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Sergiy SSC Guru Points: 110208 More actions · Answer 14

Jeff Moden (9/12/2012)Just pray people named their columns for inserts or BOOM!

Not necessarily.

If you add a computed column at the end of the table it would not break existing inserts, even if the columns are not listed.

This works for me:

CREATE TABLE test (

ID int,

NAME nvarchar(50),

DESCR AS (CONVERT(nvarchar(20), ID) + ' - ' + NAME )

)

INSERT INTO test

SELECT 1, 'Number One'

SELECT * FROM Test

_____________
Code for TallyGenerator