column_name in table_name, run:SELECT max(length(column_name)) FROM table_name;
\d table_name command in the psql terminal to describe the table structure and find the defined length for column_name.UPDATE table_name SET column_name = substr(column_name, 1, [max_length]) WHERE length(column_name) > [max_length];
Replace [max_length] with the appropriate length limit.
ALTER TABLE table_name ALTER COLUMN column_name TYPE varchar(new_length);
Replace new_length with the new size required for the column.
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