how to find out field size?

From: Shaozhong SHI <shishaozhong(at)gmail(dot)com>
To: pgsql-general <pgsql-general(at)lists(dot)postgresql(dot)org>
Subject: how to find out field size?
Date: 2022-04-04 15:28:37
Message-ID: CA+i5JwYqegWHbhtQAjmCRn5r1DQb_vUbk+ftWF3nNB2eyj+Y=Q@mail.gmail.com
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Postgres documentation says: maximum field size is 1 GB.
PostgreSQL: Documentation: 12: Appendix K. PostgreSQL Limits
<https://www.postgresql.org/docs/12/limits.html>

So, how to find out the size of column to see how far it from the limit?

Regards,

David

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