--跨表连查更新
create table m_name  (id int,name varchar(4))
insert into m_name
select 1,'张三' union all
select 2,'李四' union all
select 3,'王五'

select * from m_name
/*
id          name
----------- ----
1           张三
2           李四
3           王五
*/

create table m_chengji  (name varchar(4),kemu int,chengji int,id sql_variant)
insert into m_chengji
select '张三',1,95,null union all
select '张三',2,92,null union all
select '张三',3,91,null union all
select '李四',1,56,null union all
select '李四',2,76,null union all
select '李四',3,99,null union all
select '王五',1,57,null union all
select '王五',2,100,null union all
select '王五',3,67,null

select * from m_chengji
/*
name kemu        chengji     id
---- ----------- ----------- -----------
张三   1           95          NULL
张三   2           92          NULL
张三   3           91          NULL
李四   1           56          NULL
李四   2           76          NULL
李四   3           99          NULL
王五   1           57          NULL
王五   2           100         NULL
王五   3           67          NULL
*/

update m_chengji 
set id = a.id from m_chengji b left join m_name a on a.[name]=b.[name]

------解决方案--------------------
SQL code

UPDATE B SET COL1=A.COL1,COL2=A.COL2 ,.. FROM A WHERE A.ID=B.ID

 INSERT B (ID,COL1,COL2...)SELECT ID,COL1,COL2... FROM A WHERE NOT EXISTS(SELECT 1 FROM B WHERE B.ID=A.ID)

------解决方案--------------------

SQL code

     if exists(select [Name] from tb1 where [Name]='张三')
          update tb1 set [Phone]='123' where [Name]='张三'
     else
          insert tb1 values('张三','123')
     end