What is Place holder Columns?

Answer Posted / oracleapps_learner

A placeholder is a column is an empty container at design
time. The placeholder can hold a value at run time has been
calculated and placed in to It by pl/sql code from anther
object.
You can set the value of a placeholder column is in a
Before Report trigger.
Store a Temporary value for future reference. EX. Store
the current max salary as records are retrieved.

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