Question

I really want to be be cautious when doing my job.

I need to replace blank with some text in my SQL Query but I don’t want actually update into database, just want to update to data I query.

If I use Replace() will it replace on server too or just to data I query?

can you provide me with example, how I can use Replace() to replace only in data I read not into server.

Answer 1

How you use REPLACE has nothing to do with updating data.

Rather, it is whether you use a SELECT or UPDATE statement that matters.

A SELECT statement will only query (retrieve) data, it will not modify it in the database.

Oracle Docs:

Use a SELECT statement or subquery to retrieve data from one or more
tables, object tables, views, object views, or materialized views.

An UPDATE statement will modify the data in the database, assuming it finds matching rows.

Oracle Docs:

Use the UPDATE statement to change existing values in a table or in
the base table of a view or the master table of a materialized view.