sqlserver 适用的功能 upsert

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merge into Target?using Source

on (condition)

when matched then?

update set column1=value1

when not matched then

insert (column1,?column2) values (value1,?value2);

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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

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