select table_catalog,table_schema,table_name,column_name,ordinal_position,column_default,character_maximum_length,character_octet_length,character_set_name,collation_name,column_key,extra,privileges,column_comment,is_generated,generation_expression from information_schema.columns where table_name='t1';
select table_catalog,table_schema,table_name,column_name,ordinal_position,column_default,character_maximum_length,character_octet_length,character_set_name,collation_name,column_key,extra,column_comment,is_generated,generation_expression from information_schema.columns where table_name='t1';