Question

这是我的表：

id    delivery_mode    old_delivery_mode

123   email             sms
126   sms               sms
139   email            facebook
147   facebook          email
198    sms               sms
210   sms               email

我想用这些值更新我的表字段值：

 sms=100
 email=200
 facebook=300

那样：

id    delivery_mode    old_delivery_mode

123   200               100
126   100               100
139   200               300
147   300               200
198   100               100
210   100               200

我想在单个SQL查询中执行此操作。

我该怎么做？

Answer 1

UPDATE  YOUR_TABLE_NAME
SET     delivery_mode =
        CASE
            WHEN delivery_mode = 'sms' THEN '100'
            WHEN delivery_mode = 'email' THEN '200'
            WHEN delivery_mode = 'facebook' THEN '300'
           WHEN delivery_mode THEN delivery_mode
        END,
     old_delivery_mode =
        CASE
            WHEN old_delivery_mode = 'sms' THEN  '100'
            WHEN old_delivery_mode = 'email' THEN '200'
            WHEN old_delivery_mode = 'facebook' THEN '300'
        WHEN old_delivery_mode THEN old_delivery_mode
        END

Answer 2

是的，这是可能的 - 您可以使用INSERT ... ON DUPLICATE KEY UPDATE。

使用示例：

INSERT INTO table (id,Col1,Col2) VALUES (1,1,1),(2,2,3),(3,9,3),(4,10,12)
ON DUPLICATE KEY UPDATE Col1=VALUES(Col1),Col2=VALUES(Col2);

我发现它here

这就是你要找的东西吗？

Answer 3

我不确定这是否是你想要的

Update table1 set 
delivery_mode = case delivery_mode when 'sms' then '100' when 'email' then '200' when facebook then '300' end,
old_delivery_mode = case delivery_mode when 'sms' then '100' when 'email' then '200' when facebook then '300' end

Answer 4

这是你想要的吗？

update your_table 
set old_delivery_mode = delivery_mode,
    delivery_mode = 
      case delivery_mode 
        when 'sms' then '100'
        when 'email' then '200'
        when 'facebook' then '300'
      end
where delivery_mode in ('sms','email','facebook')

在sqlite下测试。

Answer 5

SQL等价物将使用CASE，如下所示：

UPDATE myTable
SET delivery_mode = CASE delivery_mode 
      WHEN 'sms' THEN '100'
      WHEN 'email' THEN '200'
      WHEN 'facebook' THEN '300' 
      ELSE delivery_mode END -- ELSE to make sure other values aren't touched
   , old_delivery_mode = CASE old_delivery_mode 
      WHEN 'sms' THEN '100'
      WHEN 'email' THEN '200'
      WHEN 'facebook' THEN '300' 
      ELSE old_delivery_mode END
-- And WHERE to make sure only the applicable rows are updated
WHERE delivery_mode IN ('sms','email','facebook')
OR old_delivery_mode IN ('sms','email','facebook')

其中有一些额外的检查（已评论），因为我们不知道这些列可能具有的其他值，或者此更新应考虑整个表中的行数。

更新查询SQL以更新表的各个字段？

5 个答案: