For fields of character type and character variation type, you can also use the following statements to query.

choose

Attname is name, typname is type, and atttypmod-4 is size.

from

Pg_class is a.

The left outer connection pg_attribute is b ON (b.attrelid = a.oid).

The left external connection pg_type is c ON(b. atttype id = c. oid).

Where a.rel name ='< tablename & gt' attname ='< field name & gt'

And b.attstattarget =-1

Sort by attnum;

I hope it helps you.

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