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This means SQL’s optimizer will, so to speak, access the record with employee number 999901, and substitute the existing values with the new ones indicated in the UPDATE statement.
Note that we did not update the “hire date” column value, right? This is fine, as we do not have to update each value of the record of interest. With a different birthdate and gender, although with the same hire date.
Please note that it will be very hard to practice these statements unless we switch off the following feature of Workbench.
We can expand the Edit tab from the Main Menu and opt for “Preferences”.
If you don’t, you risk turning your data set into a mess.
That’s why we will continue without enabling this option. And please remember that after turning off the “Safe Updates” option, you must be very careful when updating and deleting data in My SQL.
Remember, you should be careful when using this command because once you execute COMMIT, you cannot reverse any change!
So, after running ROLLBACK, where will we go back to? We see the information we had in the “Departments Duplicate” table at the beginning of this post.
Through the ticking of this option, the software could prevent you from losing significant amounts of data or some of the changes you made earlier.
However, it could also eliminate the possibility of the state of the data in our database.