Rolling months using Answers ( without AGO and TIME dimension) : OBIEE

Let say I want to get Previous months value for a measure called sold quantity as shown below (assume you don't have access to RPD and time dimension is not configured)

Employee Sold Quantity - Sept Sold - Quantity - Oct Sold Qunaity - Aug
A 125 220 524
B 291 254 241
C 150 45 247

We can achieve this using

AGO function Using time hierarchy -- RPD
TIMESTAMPADD(SQL_TSI_MONTH) and filter function --- Answers

what if my Created Month date format is YYYY / MM : 2013 / 09 ?
Two ways
1) Creating a repository variable and writing some sql to retrieve value as 2013 / 09 format

FILTER ( "- Sales Facts"."Sold Quantity" USING "- Created Date"."Created Month" = valueof(previousmonth_sept) ) FILTER ( "- Sales Facts"."Sold Quantity" USING "- Created Date"."Created Month" = valueof(previousmonth_Oct) )

but you need to create variables in rpd
2) when you don't have access to RPD and time dimension is not configured
a) Extract Last Month using below formula (-1 last month on current date you can change - 2,-3 to get other month values.....)

(TIMESTAMPADD(SQL_TSI_MONTH, -1, TIMESTAMPADD( SQL_TSI_DAY , DAYOFMONTH( CURRENT_DATE) * -(1) + 1, CURRENT_DATE)))

b) Extract YEAR and MONTH as shown below and contact both to get 2013 / 09 format

(CAST((YEAR(TIMESTAMPADD(SQL_TSI_MONTH, -1, TIMESTAMPADD( SQL_TSI_DAY , DAYOFMONTH( CURRENT_DATE) * -(1) + 1, CURRENT_DATE)))) AS CHAR(4))) || ' / ' ||
CASE WHEN LENGTH(CAST((MONTH(TIMESTAMPADD(SQL_TSI_MONTH, -2, TIMESTAMPADD( SQL_TSI_DAY , DAYOFMONTH( CURRENT_DATE) * -(1) + 1, CURRENT_DATE)))) AS CHAR(2)))= 1 THEN CAST( 0 AS CHAR(1))|| CAST ( (MONTH(TIMESTAMPADD(SQL_TSI_MONTH, -2, TIMESTAMPADD( SQL_TSI_DAY , DAYOFMONTH( CURRENT_DATE) * -(1) + 1, CURRENT_DATE)))) AS CHAR(2))
ELSE (CAST((MONTH(TIMESTAMPADD(SQL_TSI_MONTH, -2, TIMESTAMPADD( SQL_TSI_DAY , DAYOFMONTH( CURRENT_DATE) * -(1) + 1, CURRENT_DATE)))) AS CHAR(2))) END)

Pull a dummy column to criteria and in answer Edit the column formula with below formula

FILTER ( "- Sales Facts"."Sold Quantity" USING "- Created Date"."Created Month"= (CAST((YEAR(TIMESTAMPADD(SQL_TSI_MONTH, -1, TIMESTAMPADD( SQL_TSI_DAY , DAYOFMONTH( CURRENT_DATE) * -(1) + 1, CURRENT_DATE)))) AS CHAR(4))) || ' / ' ||CASE WHEN LENGTH(CAST((MONTH(TIMESTAMPADD(SQL_TSI_MONTH, -2, TIMESTAMPADD( SQL_TSI_DAY , DAYOFMONTH( CURRENT_DATE) * -(1) + 1, CURRENT_DATE)))) AS CHAR(2)))= 1 THEN CAST( 0 AS CHAR(1))|| CAST ( (MONTH(TIMESTAMPADD(SQL_TSI_MONTH, -2, TIMESTAMPADD( SQL_TSI_DAY , DAYOFMONTH( CURRENT_DATE) * -(1) + 1, CURRENT_DATE)))) AS CHAR(2)) ELSE (CAST((MONTH(TIMESTAMPADD(SQL_TSI_MONTH, -2, TIMESTAMPADD( SQL_TSI_DAY , DAYOFMONTH( CURRENT_DATE) * -(1) + 1, CURRENT_DATE)))) AS CHAR(2))) END)

Rolling back based on number you have entered in prompt ?

Create Tex box Type prompt and assign presentation variable for example 'monthnum' then Fx formula should as shown below

FILTER ( "- Sales Facts"."Sold Quantity" USING "- Created Date"."Created Month"= (CAST((YEAR(TIMESTAMPADD(SQL_TSI_MONTH, -@{monthnum}, TIMESTAMPADD( SQL_TSI_DAY , DAYOFMONTH( CURRENT_DATE) * -(1) + 1, CURRENT_DATE)))) AS CHAR(4))) || ' / ' ||CASE WHEN LENGTH(CAST((MONTH(TIMESTAMPADD(SQL_TSI_MONTH, -2, TIMESTAMPADD( SQL_TSI_DAY , DAYOFMONTH( CURRENT_DATE) * -(1) + 1, CURRENT_DATE)))) AS CHAR(2)))= 1 THEN CAST( 0 AS CHAR(1))|| CAST ( (MONTH(TIMESTAMPADD(SQL_TSI_MONTH, -2, TIMESTAMPADD( SQL_TSI_DAY , DAYOFMONTH( CURRENT_DATE) * -(1) + 1, CURRENT_DATE)))) AS CHAR(2)) ELSE (CAST((MONTH(TIMESTAMPADD(SQL_TSI_MONTH, -2, TIMESTAMPADD( SQL_TSI_DAY , DAYOFMONTH( CURRENT_DATE) * -(1) + 1, CURRENT_DATE)))) AS CHAR(2))) END)

Note : You will see impact on report performance when you use same formula for more than 2 months prefer this option only if you don't have access to RPD and Time dimension is not configured or only for limited months (Previous and Current Month) with different Month Name format . Otherwise AGO function gives better query performance in more efficient way