Length of sql cols in postgresql

Hello,

I have problem with the cols of table. Postgresql truncates some of them
which are longer than 30 characters.
And when I execute a request in psql, I have the following message:

psql:/applis/jgenea/test.sql:37: NOTICE: identifier
"commune_nom_equivalent_naissance"
will be truncated to "commune_nom_equivalent_naissanc"

Is it possible to increase the maximum length?
Thianks for your help
Thierry

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