UTL_RAW.CAST_TO_RAW
UTL_RAW.CAST_TO_Varchar2
cast_to_raw()要在源库(A):
create view v_tab as select utl_raw.cast_to_raw(x) x from tab;
而cast_to_varchar2()要在目标库(B):
create public database link dblink_a connect to usr using 'a' identified by pwd;
insert into tab select utl_raw.cast_to_varchar2(x) from v_tab@dblink_a;
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