select distinct a.column from table1 as a inner join table2 as b on a.column1 = b.column2;
db2set db2codepage=1208(utf-8)
db2 load query table xxxxx db2 set integrity for xxxxx immediate checked
alter table xxxx drop contraint F_xxxxxx;
原文：http://www.cnblogs.com/fxust/p/7327982.html