How to update specified column in table?

Hi,there,
I'm green in oracle,I have 2 tables with the same
fields, the same structure, I call it Ta and Tb,here
is their structure:
Ta:
Name Type
================
Col1 Varchar2(10)
Col2 Varchar2(10)
Col3 Varchar2(10)
Tb:
Name Type
========================
Col1 Varchar2(10)
Col2 Varchar2(10)
Col3 Varchar2(10)
Here is their Data:
Ta:
Col1 Col2 Col3
========================
c11 c31
c12 c32
c13 c33
Tb:
Col1 Col2 Col3
========================
c11 c21 c31
c12 c22 c32
c13 c23 c33
so how can I copy the contents of Col2 of Tb into
col2 of Ta using SQL or PL/SQL? I mean I want to
fill col2 of Ta with the data of col2 of Tb,pls
help me,thanks in advance!
NewOra

Here is the query
update Ta set Ta.col2 = (select Tb.col2 from Tb where Ta.col1 = Tb.col1 and Ta.col3 = Tb.col3)
if u have the primary key columns is the tables u dont need to incolude all the columns in the where clause, u can use only key columns.

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