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CREATE TABLE MyTable(Flag INT, ID INT, OrderID INT);

INSERT INTO MyTable(ID, OrderId, Flag)
VALUES (5, 10, 0),(5, 11,0);
UPDATE MyTable
SET Flag = 1
WHERE (ID,OrderID) IN (SELECT ID,OrderID
FROM MyTable
WHERE ID = 5
ORDER BY OrderID DESC LIMIT 1);
SELECT * FROM MyTable;
Flag ID OrderID
0 5 10
1 5 11