更新多个字段的UPDATE语句
update tableA a set (a.v1, a.v2, a.v3, a.v4) = --使用括号确定更新的字段范围 (select c.value1, c.value2, c.value3, c.value4 from tableC c, tableD d where d.id = c.id and c.field = '0' and a.test = d.test) --被更新表字段与更新表字段进行关联 where exists (select 1 --使用exists确定其更新的数据记录范围 from tableB b where a.id = b.id and b.name = 'name')