Question

I have a question

Can we convert date 20-06-2011 (dd-mm-yyyy) into 0611 using sql (SQL server database) ?

And

Can we count ID below
keeping in mind last 4 digits which represent date (last 4 digits represent date in the form MMYY) so numbers with last 4 digits 0611 count should be 3

What would be the SQl Query for the count?

ID

AOB2340511
AOB4560511
AOB3500611
AOB4410611
AOB5120611
AOB1250411

Answer 1

EDIT: Corrected DATE data type option.

If your date fields are DATE data types you can do the following.

SELECT RIGHT('0' + CAST(DATEPART(MM, @TheDate) as VARCHAR), 2)
    + RIGHT(CAST(DATEPART(YY, @TheDate) as VARCHAR), 2)

If your date fields are stored as a string type, such as VARCHAR, NVARCHAR, etc, then try the following

select SUBSTRING(TheDate, 4, 2) + SUBSTRING(TheDate, 9, 2)

For the question about count, you can try this

SELECT RIGHT(ID, 4) AS TheDate, Count(*) AS TheCount
FROM MyTable
GROUP BY RIGHT(ID, 4)

If you need a query for the count that also shows the ID value, give this a try

SELECT ID, RIGHT(ID, 4) as MMYY,
    COUNT(*) OVER (PARTITION BY RIGHT(ID, 4)) AS TheGroupCount
FROM MyTable
ORDER BY ID