sql update from two different database

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Lisa
19 May 2020
1update table_name1
2set column_name = T2.column_name
3from database_name.dbo.table_name2 as T2
4  where table_name1.ID = T2.ID
Marie
20 Feb 2019
1update table1
2set col2 = T2.col2
3from DataBaseName.dbo.table1 as T2
4  where table1.ID = T2.ID and
5        table1.col2 is null