MSSQL的处理方法
update table1
set field_1 = field_2, field_2 = field_1
可是MySQL就不能这样写，不然一列会覆盖另一列记录
MySQL语句如下
update table1 a, table1 b
set a.field_1 = b.field_2, a.field_2 = b.field_1
where a.id = b.id
mysql
update sy_subscribe t , sy_subscribe t1 set t.source_keyword= t1.source_id , t.source_id = t1.source_keyword ,t.unique_id = CONCAT(t1.source_id,'_',t1.source_keyword)
where t.subscribe_id = t1.subscribe_id and t.subscribe_id =1209