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SQL, Convert date time with other column produce different result set

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Last Modified: 2014-01-31
I tried with SQL below to combine the empid with Active which as when I combine both column MTHID show me different results.

SELECT CASE
            WHEN len(month([Active])) =1  
               THEN empid+ concat(year([Active]),'0',month([Active]))
               ELSE concat(year([Active]),month([Active]))
       END as MonthID, *
FROM MY_CATW

MTHID           EMPID
20212341      20010940
20212341      20010940


With below SQL which I did not combine it appears correctly, so I expect when we combine both column it should have result like 20010940201401

SELECT CASE
            WHEN len(month([Active])) =1  
               THEN   concat(year([Active]),'0',month([Active]))
               ELSE concat(year([Active]),month([Active]))
       END as MonthID, *
FROM MY_CATW

MTHID   EMPID
201401      20010940
201401      20010940
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Commented:
Try this:
SELECT CASE 
            WHEN len(month([Active])) =1  
               THEN concat(empid, year([Active]),'0',month([Active])) 
               ELSE concat(empid, year([Active]),month([Active])) 
       END as MonthID, * 
FROM MY_CATW

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See http://sqlfiddle.com/#!6/297f0/2
Surranoapplication manager

Commented:
strange... It seems you want to pad the month with 0 to be two digits always, but you want to prefix it with empid only if it needed the padding and not otherwise?!?
I believe mankowitz's solution makes sense if you *always* want to prefix with empid.
Also check this:

SELECT concat(empid, left(convert(varchar(10), [Active], 112),6) as MonthID, *
FROM MY_CATW;

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For details on converting date to char, check here:
http://www.w3schools.com/sql/func_convert.asp
Scott PletcherSenior DBA
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Most Valuable Expert 2018
Distinguished Expert 2019

Commented:
SELECT CONCAT(empid, CONVERT(varchar(6), [Active], 112)) AS MonthID, *
FROM MY_CATW
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Author

Commented:
hello all,
I finally manage to resolve my own, that simply because the empid have data type float which would not able to convert to nvarchar.
I have change the empid table to nvarchar and the combination works fine with my ols scripts

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