RANGE BETWEEN in SQL Server

Question

Hi All,
I am trying to convert following Oracle query to SQL Server and having issues in defining calculation in the BETWEEN of the PARTITION.
ORACLE Query:
SELECT  
  head.acct_unit, head.company,head.role_id,    
   AVG(head.HEADCOUNT) over 
      (partition by head.acct_unit, head.company,head.role_id
       order by head.posting_month 
       range between  head.posting_month - trunc(head.posting_month,'YYYY') PRECEDING and current row)  YTD_HEADCOUNT
FROM
TABLE_A head
SQL Server:
SELECT  
  HEAD.ACCT_UNIT, HEAD.COMPANY,HEAD.ROLE_ID, 
  AVG(HEAD.HEADCOUNT) OVER 
      (PARTITION BY HEAD.ACCT_UNIT, HEAD.COMPANY,HEAD.ROLE_ID
       ORDER BY HEAD.POSTING_MONTH 
       -- RANGE BETWEEN DATEDIFF(dd,DATEADD(yy, DATEDIFF(yy,0,HEAD.POSTING_MONTH), 0),HEAD.POSTING_MONTH)
PRECEDING AND CURRENT ROW
FROM
TABLE_A head
Any help in this regard is highly appreciated.
Regards,
Shijith
SE

Answer 1

hi,
when asking these kind of questions, you should provide a script to create an example table and data.
I presume you want the range from the beginning of the year to the present record;
if so, you could try this (again: I have no idea what datatype posting_month is, and how many records there are, and what you want to see)
SELECT  
  HEAD.ACCT_UNIT, HEAD.COMPANY,HEAD.ROLE_ID, 
  AVG(HEAD.HEADCOUNT) OVER 
      (PARTITION BY HEAD.ACCT_UNIT, HEAD.COMPANY,HEAD.ROLE_ID
       ORDER BY HEAD.POSTING_MONTH 
       RANGE BETWEEN (DATEPART(mm,HEAD.POSTING_MONTH)) PRECEDING
AND CURRENT ROW )
FROM
TABLE_A head
Regards, Nico
pdfaid, my blog