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Editorial Team
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Asked: 2026-05-12T19:05:24+00:00

I’d like to limit the entries in a table. Let’s say in table tBoss

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I’d like to limit the entries in a table. Let’s say in table tBoss. Is there a SQL constraint that checks how many tuples are currently in the table? Like

SELECT COUNT(*) from tBoss < 2

Firebird says:

Invalid token.
Dynamic SQL Error.
SQL error code = -104.
Token unknown – line 3, column 8.
SELECT.

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1 Answer

  1. Editorial Team

    Does your database have triggers? If so, Add a trigger that rolls back any insert that would add more than 2 rows…

    Create Trigger MyTrigName
For Insert On tBoss
As
    If (Select Count(*) From tBoss) > 2
       RollBack Transaction

    but to answer your question directly, the predicate you want is to just put the select subquery inside parentheses. like this …

      [First part of sql statement ]
  Where (SELECT COUNT(*) from tBoss) < 2
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