Oracle D2K Question:
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What is the Placeholder Column?
What is the Format Trigger?

Answer:

A placeholder column is used to hold the value of certain calculation or a variable that is being carried out in a formula column. A place holder can be defined as anumber, character or date type, depending upon the type of value which will be stored into it.

A format trigger is used when we want to display a particular field, if certain conditions are met.

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