How to insert the 20 records in a single table

Hi all,
I want to insert documents 20 only in a table, but suppose I want to enter the folder 21 it will be not inserted.
Suppose that to delete a record and then insert, it will insert.
but always count (*) is not greater than 20.
is there any solution for this
Please help me

Create a trigger Before Insert database on the table to keep the count = 20 in the table. If it exceeds, raise the exception and cancel the insert operation.

Tags: Database

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