Update a field in sql developer

The following query can be an example of this usage method. We have typed the Persons table after the MERGE statement because it is our target table, which we want to update, and we gave Per alias to it in order to use the rest of the query. With the help of this syntax, the join condition is defined between the target and source table.

In this last line of the query, we chose the manipulation method for the matched rows. Finally, we added the semicolon ; sign because the MERGE statements must end with the semicolon signs. The major characteristic of the subquery is, they can only be executed with the external query. The noticeable difference in this method is, it might be a convenient way to update one column for the tables that have a small number of the rows. Now we will execute the following query and then will analyze it.

After the execution of the update from a select statement the output of the table will be as below;. As we can see, the PersonCityName column data of the Persons table have been updated with the City column data of the AddressList table for the matched records for the PersonId column. Regarding this method, we should underline the following significant points. If the subquery finds more than one matched row, the update query will return an error, as shown below:. In this article, we learned to update the data in a table with the data where they are contained in other tables.

PersonId INT. PersonName , PersonLastName. N 'Salvador' , N 'Williams' ,. N 'Lawrence' , N 'Brown' ,. N 'Gilbert' , N 'Jones' ,.

N 'Ernest' , N 'Smith' ,. N 'Jorge' , N 'Johnson'. PersonId , PostCode , City. City ,. AddressList Addr. You can compile a positioned update even if the cursor has not been opened yet. However, removing the open cursor with the JDBC close method invalidates the positioned update. Dropping an alias invalidates a prepared update statement if the latter statement uses the alias. SQL Ask Question. Asked 13 years ago. Active 9 years, 8 months ago. Viewed 3k times.

Improve this question. Juan Mellado Add a comment. Active Oldest Votes. Improve this answer. Charles Bretana Charles Bretana k 22 22 gold badges silver badges bronze badges. You somehow need to specify which of these multiple ones you want the UserID from. Cade Roux Cade Roux I don't understand you answer? Why does it matter whether it is hosted off-site or not? Normalization remains normalization.

And if you don't understand the relations between the tables you should not modify data.