The information in result consists of data for the rows lines and for the columns select_list.
If specified, lines defines whether the results set consists of multiple rows (table-like structure) or a single row
(flat structure). Identical
rows in the results set can be excluded, and individual rows can be protected from parallel changes by another program.
It SELECT list select_list
specifies the columns to be read and defines their names in the results set. Note that column names from the database table can be changed. For single columns,
aggregate expressions can be used to specify
SQL expressions enable table fields to be evaluated in the database system.