1update table_name1
2set column_name = T2.column_name
3from database_name.dbo.table_name2 as T2
4 where table_name1.ID = T2.ID
1update table1
2set col2 = T2.col2
3from DataBaseName.dbo.table1 as T2
4 where table1.ID = T2.ID and
5 table1.col2 is null