在此处找到解决方案：https ://stackoverflow.com/a/4685040/1266457
谢谢 ：）
修理：
// Prepare and execute the variables first
$sql = "
SET @prev_value = NULL;
SET @rank_count = 0;
SET @rank_increasing = 0;
";
$sth = $dbh->prepare($sql);
$sth->execute();
// Run the main query
$sql = "
SELECT a.*
, @rank_increasing := @rank_increasing + 1 AS row_num
, CASE
WHEN @prev_value = score
THEN @rank_count
WHEN @prev_value := score
THEN @rank_count := @rank_increasing
END AS rank
FROM (
-- INLINE VIEW --
) a
"; ...
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