在mysql中，我們可以使用一些簡單的sql語句來計算成績的分布律。下面是一些示例代碼：

-- 計算成績總數
SELECT COUNT(*) FROM score;
-- 計算成績總和
SELECT SUM(score) FROM score;
-- 計算平均分
SELECT AVG(score) FROM score;
-- 計算最高分
SELECT MAX(score) FROM score;
-- 計算最低分
SELECT MIN(score) FROM score;
-- 計算各個成績段的人數和比例
SELECT 
'60-69' AS `range`, COUNT(*) AS `count`, 
CONCAT(ROUND(COUNT(*)/(SELECT COUNT(*) FROM score), 4)*100, '%') AS `percent`
FROM score WHERE score>=60 AND score<=69
UNION ALL
SELECT 
'70-79' AS `range`, COUNT(*) AS `count`, 
CONCAT(ROUND(COUNT(*)/(SELECT COUNT(*) FROM score), 4)*100, '%') AS `percent`
FROM score WHERE score>=70 AND score<=79
UNION ALL
SELECT 
'80-89' AS `range`, COUNT(*) AS `count`, 
CONCAT(ROUND(COUNT(*)/(SELECT COUNT(*) FROM score), 4)*100, '%') AS `percent`
FROM score WHERE score>=80 AND score<=89
UNION ALL
SELECT 
'90-100' AS `range`, COUNT(*) AS `count`, 
CONCAT(ROUND(COUNT(*)/(SELECT COUNT(*) FROM score), 4)*100, '%') AS `percent`
FROM score WHERE score>=90 AND score<=100;

以上代碼分別計算了成績的總數、總和、平均分、最高分、最低分以及各個成績段的人數和比例。我們可以根據這些數據進一步分析學生的成績分布情況，為學生提供更好的學習建議。