Placeholder column's "initial value"

Hello,
I have a report with 2 queries, the master query contains some placeholder columns, and the detail query contains a formula column that sets values for these placeholders:
- MASTERQUERY: database columns, PlaceHolder1, PlaceHolder2, PlaceHolder3
|
|
-- DETAILQUERY (linked to MASTERQUERY): database columns, CF_PlaceHolder_Changer (change values of PlaceHolderX)
The problem is: for a particular record of MASTERQUERY, if the DETAILQUERY doesn't have any row then PlaceHolders are not set.
(They will keep the values from previous MASTER record). Is there any way that I can specify "initial value" for placeholder columns?
And another question: what is the formula attached to the placeholder used for?
Please help!

You could have a "count" column in the master group that determines how many rows are in the detail group. Then alter the value of the field displaying the placeholder value by adding a format trigger with srw.set_field_char/date/number(0, <initial value>); when the count is '0'.

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Query on PlaceHolder column

Hi everyone,
I am pretty new to oracle reports, if you think this question is too basic, please bear with me.I also tried searching the forum and looked into documentation. Why should we use a formula column to assign value to a placeholder column, why cant it be done directly in the plsql formula portion. Why does it not accept any return values in the plsql formula portion of the placeholder column, when i add the code, it acpets and gets compiled, but does not get reflected during runtime. Can someone help me ab this.
Thanks
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Formula and Placeholder columns work together to give a calculated or processed value. The formula column calculates or processes the data and then assigns the result to the placeholder column. Bit like in PL/SQL when you have a variable (placeholder col) being set by a function (Formula col).
HTH!!

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Message was edited by:
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Placeholder column

Friends !
Can anyone tell me the purpose and the difference with others of the following of Report Builder,
PLACEHOLDER COLUMN
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Anyone's help or better to have examplary code will add a great help.
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[email protected]
null

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Thanks, but the link didn't help me. Basically, this is the situation:
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