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NULL Handling

What you’ll learn in this Chapter

✓ NULL vs empty strings
✓ NULL in Oracle vs. NULL in PostgreSQL
✓ Converting pipe “||” operator
✓ NULL in Unique Constraints


NULL is a very important feature in any database. Ignoring NULL in any sort brings some uninvited challenges and issues. So, while migration from an Oracle database to PostgreSQL, you must be very careful and cautious in its implementation.

This chapter aims at giving you complete knowledge of the behavior of NULL in Oracle and PostgreSQL databases.


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