insert into Tongj_Item
select '2061855','admin', case String_tongjlb
                                                when '1' then 'haha'
                                                else 'hehe'
                                           end
,str_LeibMingc,'admin',1,getdate()
from tj_gongzltj
group by String_tongjlb,str_LeibMingc

在sql编程中尽量减少使用游标，可直接将搜出的数据插入表，结合case，group等语句控制内容，可以避免主键重复。