Mit UPATE werden Datenwerte in der Datenbank aktualisiert. Nach Bedürfnis
können auch mehrere Datensätze auf einmal verändert werden. Mit WHERE werden
nur bestimmte Datensätze zu aktualisiert.
UPDATE suppliers
SET supplier_id = 50,
supplier_name = 'Apple',
city = 'Cupertino'
WHERE
supplier_name = 'Google';
UPDATE Table_name
-- The desired value
SET Column_name = desired_value
-- Any value, of the item, of which one value you want to change
WHERE Column_name = value
In SQL Server 2008 (or newer), use MERGE
MERGE INTO YourTable T
USING other_table S
ON T.id = S.id
AND S.tsql = 'cool'
WHEN MATCHED THEN
UPDATE
SET col1 = S.col1,
col2 = S.col2;
Alternatively:
MERGE INTO YourTable T
USING (
SELECT id, col1, col2
FROM other_table
WHERE tsql = 'cool'
) S
ON T.id = S.id
WHEN MATCHED THEN
UPDATE
SET col1 = S.col1,
col2 = S.col2;
UPDATE sakila.actor # table to update
SET first_name = "Bryan", last_name = "Besmond" # fields to be added/updated
WHERE actor_id = 201; # boolean condition
UPDATE mytable t -- Update using WITH statement
SET value3 = (
WITH comp AS (
SELECT id, value1
FROM mytable t
WHERE value2 > 10
)
SELECT c.value1
FROM comp c
WHERE c.id = t.id
);
UPDATE Table_A SET Table_A.col1 = Table_B.col1, Table_A.col2 = Table_B.col2 FROM Some_Table AS Table_A INNER JOIN Other_Table AS Table_B ON Table_A.id = Table_B.id WHERE Table_A.col3 = 'cool'
Updates existing data in a table.
Example: Updates the mileage and serviceDue values for a vehicle with an
id of 45 in the cars table.
UPDATE cars
SET mileage = 23500, serviceDue = 0
WHERE id = 45;