心得

題目要求找出成績排名，如果分數相同的話則相同名次，MySQL不像MSSQL有ROW_NUMBER()可以用，只好用個變數來存了。

問題

Write a SQL query to rank scores. If there is a tie between two scores, both should have the same ranking. Note that after a tie, the next ranking number should be the next consecutive integer value. In other words, there should be no “holes” between ranks.

+----+-------+ | Id | Score | +----+-------+ | 1 | 3.50 | | 2 | 3.65 | | 3 | 4.00 | | 4 | 3.85 | | 5 | 4.00 | | 6 | 3.65 | +----+-------+

1 2 3 4 5 6 7 8 9 10

+----+-------+ | Id | Score | +----+-------+ | 1  | 3.50  | | 2  | 3.65  | | 3  | 4.00  | | 4  | 3.85  | | 5  | 4.00  | | 6  | 3.65  | +----+-------+

For example, given the above Scores table, your query should generate the following report (order by highest score):

+-------+------+ | Score | Rank | +-------+------+ | 4.00 | 1 | | 4.00 | 1 | | 3.85 | 2 | | 3.65 | 3 | | 3.65 | 3 | | 3.50 | 4 | +-------+------+

1 2 3 4 5 6 7 8 9 10

+-------+------+ | Score | Rank | +-------+------+ | 4.00  | 1    | | 4.00  | 1    | | 3.85  | 2    | | 3.65  | 3    | | 3.65  | 3    | | 3.50  | 4    | +-------+------+

答案