Update Queries

For updating values already entered into a database. Can edit multiple rows at once. Not using the WHERE clause will cause every entry to be edited.

UPDATE table SET column1=value1 WHERE column2=value2;	Changes values in column1 to value1, where column2 equals value2
UPDATE table SET column1=value1;	Sets all column1 values, on every row, to value1 (regardless of their current value).
UPDATE table SET column1=value1, column2=value2;	Changes column1 to value1, and column2 to value2.

Basic Quiz

All these questions will use this table called Employees:

1. the employee 'Cat Woman' has now moved to a new address ("10 Panther Street").

Which of the following will successfully update the 'Address':

	Update Employees Set 'Address' = '1 Panther Street'
→	Incorrect
	Update Employees Set 'Address' = '1 Panther Street' Where 'First Name' = 'Cat' And 'Last Name' = 'Woman'
→	Correct
	Update Employees Set 'Address' = '1 Panther Street' Where 'Last Name' = 'Woman'
→	Incorrect
	Update Employees Set 'Address' = '1 Panther Street' Where 'Name' = 'Cat Woman'
→	Incorrect

2. the employee 'Tweety Bird' has corrected their address which should be "10 Fowl Avenue" and the city should be 'CanaryVille'.

Which of the following will successfully update the 'Address':

	Update Employees Set 'Address' = '10 Fowl Avenue'
→	Incorrect
	Update Employees Set 'Address' = '10 Fowl Avenue', 'City' = 'CanaryVille' Where 'First Name' = 'Tweety' And 'Last Name' = 'Bird'
→	Correct
	Update Employees Set 'Address' = '10 Fowl Avenue' Where 'Last Name' = 'Woman'
→	Incorrect
	Update Employees Set 'Address' = '10 Fowl Avenue' Where 'Name' = 'Cat Woman'
→	Incorrect

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