How to join on nearest lower value in SQL

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SQL

I have two tables in sql
table1
1
2
3
5
 
table 2
2
3
4
6
 
output
 
2 2 
3 3
4 3
6 5

if matcing value found col should join on matching value else nearest lower value.

Please help me

I want to update lower or similar value in table2,,,It's urgent

Thanks in advance

What I have tried:

I have tried some joins but not succeeded, plz help