具有多个SET和WHERE的SQL语句

Question

我想知道这是否是一个有效的查询:

UPDATE  table
SET ID = 111111259

WHERE ID = 2555

AND SET ID = 111111261

WHERE ID = 2724

AND SET ID = 111111263

WHERE ID = 2021

AND SET ID = 111111264

WHERE ID = 2017

Answer 1

没有!

你需要单独处理这些

Update [table]
Set ID = 111111259
WHERE ID = 2555

Update [table]
Set ID = 111111261
WHERE ID = 2724

--...

Answer 2

最佳选择是多次更新.

或者,您可以执行以下操作,但不建议:

UPDATE table
SET ID = CASE WHEN ID = 2555 THEN 111111259 
              WHEN ID = 2724 THEN 111111261
              WHEN ID = 2021 THEN 111111263
              WHEN ID = 2017 THEN 111111264
         END
WHERE ID IN (2555,2724,2021,2017)

Answer 3

不.这不是有效的查询.您只能有一个包含多个字段的SET语句,但也有一个WHERE子句

update table1 set field1=value1, field2=value2, field3=value3 where filed4=value5

Answer 4

不，这就是你的做法：

UPDATE table SET ID = 111111259 WHERE ID = 2555

UPDATE table SET ID = 111111261 WHERE ID = 2724

UPDATE table SET ID = 111111263 WHERE ID = 2021

UPDATE table SET ID = 111111264 WHERE ID = 2017

Answer 5

您还可以像这样使用 case：

UPDATE  table
SET ID = case

when ID = 2555 then 111111259

when ID = 2724 then 111111261

when ID = 2021 then 111111263

when ID = 2017 then 111111264

else ID
end