多表更新通过UPDATE语句实现,其语法是:
UPDATE TABLE_references SET col_name1 = { expr1 | DEFAULT } [ , … ] [WHERE WHERE_cONditiON]
多表删除通过DELETE语句实现,其语法为:
DELETE tbl_name[.*] [ , tbl_name[.*] ] ... FROM TABLE_references [ WHERE WHERE_cONditiON ]