I believe something this should work. You may also need to include the main ID column from both tables to keep them in sync...
UPDATE Table2 AS table2 SET table2.column2 = (SELECT column1 FROM Table1 AS table1 WHERE table1.mainIDcolumn = table2.mainIDcolumn)
Untested, so I don't know for sure if it will work. 

 
			 
			
				
			
		
		
		
	 
								
								
									
	
	
		
			
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