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Forgive me for sneaking in a lesson about primary keys when we’re talking about update statements, but this is why it is doubly important to use primary key columns in your where clauses when updating (or deleting) records – cos if we do not uniquely identify the records we want to change (or delete), the consequences can be critical.
So, now that we’ve reinforced that point, I should probably rewrite our update statement as: Let’s try a couple more updates.
You wake up the next morning with a bit of a sore head and try to recall everything that went on the night before: you’d discovered that Chandler’s middle name is Muriel, and that Ross’ is Eustace. You roll out of bed and groggily wipe your eyes: all this new information needs recording; you’d better fire up your database.
Since we thoroughly looked into SELECT statements in the previous part, we can now turn our attention to UPDATE statements.
The syntax for update statements is as follows: To see an update statement in action, log into your Oracle environment and run a query to select Chandler’s middle name (middle names are stored in the MIDDLE_NAME column) from the FRIEND_NAME table. We also need to update Ross Geller’s middle name to Eustace. No, the issue – in this specific case – is that our WHERE clause identifies two people, since we’ve got two friends named Ross Geller.
As with the INSERT statement, the values must either match the columns data type or one that the database can implicitly convert.
The basic format is: Let's go back to the AUTHOR table and look at some examples of Oracle updates.
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CREATED_DATE); END; --Inserting values INSERT INTO BANK_TRANSACTIONS values ('1','TXN1234','Peter Thomas','12-MAY-2017','HR',sysdate); INSERT INTO BANK_TRANSACTIONS values ('2','TXN9999','Jemes Patel','10-JUN-2016','HR',sysdate); select * from BANK_TRANSACTIONS; --updating values.