sqlserver 实用的功能 upsert
?
merge into Target?using Source
on (condition)
when matched then?
update set column1=value1
when not matched then
insert (column1,?column2) values (value1,?value2);
?
?
解释：
Target?: 目标表名
Source: 源表名
Condition：为匹配条件
当matched时更新，not时则更新
?
