用一次，查一次的SQL

update

UPDATE table  SET row_name = 新值 WHERE row_name= 某值

order by

ex.

SELECT a, b FROM table  ORDER BY a DESC, b ASC

INSERT

ex.

INSERT INTO table  VALUES (data1, data2,....)
or
INSERT INTO table  (row1, row2,...) VALUES (data1, data2,....)

DELETE

ex.

DELETE FROM table  WHERE 列名称 = 值