Using a Sql Result in Default Value of Dashboard Prompt

Question

Hi,
I Create a Dashboard Prompt, this have two dates, the initial and the last for a period to filter. I need to set the default value in the fist and last date of the previous month, for example, if today is 20th of november the default value of initial date has been 1th of October and the last date has been 31th of october.
I used in default the option 'SQL Results' and use the next sentences:
SELECT TRUNC(add_months(sysdate, -1), 'MM') FROM dual;
SELECT TRUNC(last_day(add_months(sysdate, -1))) from dual;
But when I try to use the dashboard prompt the result is:
State: HY000. Code: 10058. [NQODBC] [SQL_STATE: HY000] [nQSError: 10058] A general error has occurred. [nQSError: 27002] Near <(>: Syntax error [nQSError: 26012] . (HY000)
SQL Issued: SELECT TRUNC(add_months(sysdate,-1),'MM') FROM dual
When I try to use only select sysdate from dual; the result is:
State: HY000. Code: 10058. [NQODBC] [SQL_STATE: HY000] [nQSError: 10058] A general error has occurred. [nQSError: 27004] Unresolved table: "dual". (HY000)
Thanks for your help.

Answer 1

Thanks for your help. Finally I solve this issue of
this form:
1. I Create a Initialization Block with the next
sentences:
SELECT TRUNC(add_months(sysdate, -1), 'MM')
INITIAL_DATE ,TRUNC(last_day(add_months(sysdate,
-1))) END_DATE, To_char(TRUNC(add_months(sysdate,
-1), 'MM'), 'YYYYMM') PERIOD FROM dual;
2. Then I Create three Repository Variables and
assign the Initialization Block to this
3. In the Dashboard Prompt I use the "Server
Variable" Option in the default and call the three
variables.
Thanks again
EdwinHi: How u access server variable with two fields of date. Actually, I am doing the same work. But I can not do this work. Because this is ok when the date is greater than or less than. When i use between, in default server variable button did not show any text area for reoository variable. I also made initailization block with 2 fields.
My Task is, I have to initialize the one date coloumn. From Date: and To Date. Pluzz help me in section
Ali Haroon Nawaz