max_col_length

max_col_length   table   col

Returns the length of the 'col' in table 'table'

Source code:

    set db [ns_db gethandle subquery]

    set sql "select data_length from USER_TAB_COLUMNS where table_name='[string toupper $table]' and column_name = '[string toupper $col]'"
    set table_length [database_to_tcl_string_or_null $db $sql foo]

    ns_db releasehandle $db

    return $table_length