update only one row from 2 exactly similar rows

there are 2 rows, with no PK.. both are exactly same.. I need to make one different with an update.. but whatever condition i give it is going to update both.. how can i update just one through tsql code?
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f_o_o_k_yCommented:
UPDATE TOP 1 table_name
SET col=val
WHERE <condition>
0
f_o_o_k_yCommented:
More complex example:


result:


Best Regards
Fooky
0

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