Can we have triggers that get fired when we Query a table?

Hi All,
What could be the pricise answer to the following question?
1. Can we have triggers that get fired when we Query a table?
2. What the relation of triggers and delete, truncate statement in one line?
3. What is data modelling? Why is it necessary?
4. Which are not mandatory but essential files in Oracle?
Regards,
AAK

1. Can we have triggers that get fired when we Query a table?for INSERT, UPDATE and DELETE statement, yes
for SELECT statement, no.
Question 2 is not clear for me.
Question 3 is very very general ...
4 >Which are not mandatory but essential files in Oracle?
all database files (initialization file, control files, datafiles, redo log files) are mandatory. What is not mandatory but considered as a (very) bad practice is
to have only 1 control file and only 1 redo log group with 1 redo log file.

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Can we have triggers that get fired when we Query a table?

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