MTD,YTD,PTD without calendar table

Question

          QTY
      Month
      Year
QTY_YTD
QTY_MTD
QTY_PTD
10
1
2010
20
2
2010
20
1
2012
30
3
2012
Above is how my table looks like and  all are having integer datatypes
I dont have a calendar table to join hence without calendar table can I compute YTD,MTD,PTD?
If so what will be the case queries
Mudassar

Answer 1

Please post DDL, so that people do not have to guess what the keys, constraints, Declarative Referential Integrity, data types, etc. in your schema are. Learn how to follow ISO-11179 data element naming conventions and formatting rules. Temporal data should
use ISO-8601 formats. Code should be in Standard SQL as much as possible and not local dialect. 
This is minimal polite behavior on SQL forums. 
Since SQL is a database language, we prefer to do look ups and not calculations. They can be optimized while temporal math messes up optimization. A useful idiom is a report period calendar that everyone uses so there is no way to get disagreements in the DML.
The report period table gives a name to a range of dates that is common to the entire enterprise. 
CREATE TABLE Something_Report_Periods
(something_report_name CHAR(10) NOT NULL PRIMARY KEY
   CHECK (something_report_name LIKE <pattern>),
 something_report_start_date DATE NOT NULL,
 something_report_end_date DATE NOT NULL,
  CONSTRAINT date_ordering
    CHECK (something_report_start_date <= something_report_end_date),
etc);
These report periods can overlap or have gaps. I like the MySQL convention of using double zeroes for months and years, That is 'yyyy-mm-00' for a month within a year and 'yyyy-00-00' for the whole year. The advantages are that it will sort with the ISO-8601
data format required by Standard SQL and it is language independent. The pattern for validation is '[12][0-9][0-9][0-9]-00-00' and '[12][0-9][0-9][0-9]-[01][0-9]-00'
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