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Say I have two tables, owner and dog. Both have column name, but I'd like to join them, so there is a problem since both tables have column name. Can I rename (alias) the name column in the dog table during the query?
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Merging tables by columns. Multiple tables can be merged by columns in SQL using joins. Joins merge two tables based on the specified columns (generally, the primary key of one table and a foreign key of the other).
For inner joins, the order of the join operations does not affect the query (it can affect the ordering of the rows and columns, but the same data is returned). In this case, the result set is a subset of the Cartesian product of all the tables. The ordering doesn't matter.
In Object Explorer, connect to an instance of Database Engine. In Object Explorer, right-click the table in which you want to rename columns and choose Rename. Type a new column name.
A self join uses the inner join or left join clause. Because the query that uses the self join references the same table, the table alias is used to assign different names to the same table within the query.
select d.Name as DogName, o.Name from Dog d inner join Owner o on d.OwnerID = o.OwnerID If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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