performance of two columns

Hi,

could you please let me know whether there will be any difference in performance between the following two queries. As i don't have any internal knowledge about sql, i have this doubt.

table A: column alpha has 100 million records
table B: column beta has 45 million records 

Query 1

SELECT 
A.alpha 
FROM A
WHERE 
A.alpha = B.beta

Query 2

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