只用一个查询更新多行？

Question

我有以下数据:

id = 1
name = 'john'

id = 2
name = 'jimmy'

等等

有没有办法只使用一个查询更新我的表？

Table
id | name
1  | johnny
2  | james

Answer 1

你可以实现这一目标 CASE

UPDATE YourTable
SET    name = CASE
                WHEN id = 1 THEN 'johnny'
                ELSE 'james'
              END
WHERE  id IN ( 1, 2 ) 

或另一种可能性(SQL小提琴)

UPDATE YourTable a
JOIN
   ( SELECT 1 AS id, 'johnny' AS name
     UNION ALL
     SELECT 2 AS id, 'james' AS name
   ) b ON 
   b.id = a.id
SET a.name = b.name;