Sql updating multiple rows from another table
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Consequently, to prevent this, you might do this: One potential issue may arise when the subquery actually finds more than one matching row in tbl B.
And then we'll make use of SQL Server's ability to update Table1 via a derived table definition: update T1 set T1. Date from (select row_number() over(partition by id order by Date) as rowid, id, Date from Table1 where Date is NULL) T1 join (select row_number() over(partition by id order by Date) as rowid, id, Date from Table2) T2 on T1= T2and T1.rowid = T2.rowid; You stated that the order of the matching matters but it seems like you don't have anything to ORDER BY in table 1 to create a guaranteed order to match the other table and there is no way in SQL Server to order the rows after insertion date, because information about that is not stored.
With this in mind it’s not possible to do a matching with the result you want.
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When I try to update only the missing data the non-matched data is also updated but to NULL. The reason some of your rows are getting NULLs updated is due to the subquery.