选择具有临时表的最大值的所有行

I'd like to select all the rows from a temporary table that have a value equal to the maximum value.

我想从临时表中选择值等于最大值的所有行。

TEMPORARY TABLE test

id | value
1  | 7
2  | 6
3  | 7

Expected result:

id | value
1  | 7
3  | 7

I've already tried several things but all attempts (except creating another temporary table with the same content) failed so far because of "You cannot refer to a TEMPORARY table more than once in the same query." (Source: http://dev.mysql.com/doc/refman/5.0/en/temporary-table-problems.html). Is there a possibility to do this in a more "elegant" way than copying the table and its contents?

我已经尝试了几件事但是所有尝试（除了创建具有相同内容的另一个临时表）都失败了，因为“你不能在同一个查询中多次引用TEMPORARY表”。（来源：http：//dev.mysql.com/doc/refman/5.0/en/temporary-table-problems.html）。是否有可能以比复制表格及其内容更“优雅”的方式执行此操作？

What I've tested so far:

到目前为止我测试了什么：

SELECT table1.* FROM test table1 LEFT JOIN test table2 ON table1.value < table2.value     
WHERE table2.value IS NULL;
SELECT * FROM test WHERE value = (SELECT MAX(value) FROM test);

And this is my current solution:

这是我目前的解决方案：

CREATE TEMPORARY TABLE test2 (...);
INSERT INTO test2 SELECT * FROM test;
SELECT * FROM test WHERE value = (SELECT MAX(value) FROM test2);

3 个解决方案

#1

You could try using variables. The following will scan the test table only once (not-tested):

你可以尝试使用变量。以下内容仅扫描测试表一次（未测试）：

SELECT   test.*, 
         @curMax := IF(@curMax = -1, value, @curMax)
FROM     test,
         (SELECT @curMax := -1) r
HAVING   @curMax = value OR @curMax = -1
ORDER BY value DESC;

#2

How about this:

这个怎么样：

SELECT MAX(value) INTO @max
FROM test;

SELECT *
FROM test
WHERE value = @max;

#3

Select id,value From SomeTable
inner Join (Select Max(SomeValue) as MaximumValue From SomeTable) maximums
  On SomeTable.Value = maximums.MaximumValue

Should do the job

应该做的工作

#1