mysql同一个表,将字段1和字段2内容相加,update到字段3答:create table test(col1 int,col2 int,col3 int);2、插入测试数据:insert into test values (1,10,null);insert into test values (35,546,null);insert into test values (534,33,null);insert into test values (1,34,null);3、执行update语句:update test set col3=col1+col2;4、...