create table SQLU_TEST(ID number,name varchar2(100));
insert into SQLU_TEST
select 1 id,‘S1‘ name from dual
union
select 2 id,‘S2‘ name from dual
union
select 3 id,‘S3‘ name from dual
union
select 2 id,‘S2‘ name from dual;
select * from SQLU_TEST
单条SQL是否就一定不行呢？
from sqlu_test b where b.id=1
union
select id,(select max(name) from sqlu_test a where a.id= 1) newname
from sqlu_test b where b.id=2
) t
on (t.id=st.id)
when matched then update set st.name=t.newname;
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