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"Generated Always" Clause Allows Non Numeric Data to Be Saved in Number Column (Doc ID 2997692.1)

Last updated on FEBRUARY 01, 2024

Applies to:

SQL*Plus - Version 10.1.0.5 and later
Oracle Database - Enterprise Edition - Version 10.1.0.5 and later
Information in this document applies to any platform.

Symptoms

Using "Generated Always" in table creation allows non numeric value to be saved in a NUMBER column though it is no longer possible to query the records afterwards.
The fix is to to include a validation in the PL/SQL package that is inserting data into the table, but I would like to know if this a bug or any explanation is available why this is be allowed.

The row can be saved correctly, but the concatenation expression in the "hhmm" column will yield a "1.2.2" that is an invalid number, however the error only shows up when the SELECT is executed.

This has been reproduced in SQLPlus 10g/12c and 21c, SQLcl 23.4.0 and SQLDeveloper 23.1.1, connecting to either an Oracle DB 12c or 19c.

Cause

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