Oracle Unique Constraint - Trigger to check value of property in new relation?

So the rule you want to enforce is that TABLE_1 can only reference TABLE_2 if some column in TABLE_2 is zero or less. Hmmm.... Let's sort out the trigger logic and then we'll discuss the rule.

Don't use a trigger to create a unique constraint or a foreign key constraint. Oracle has declarative support for unique and foreign keys, e.g.

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