MySQL 分組統計並列出百分比

SELECT
result,
n,
round( n / s * 100, 5 ) rat 
FROM
(
SELECT
* 
FROM
( SELECT result, count( 1 ) n FROM sendsms_log GROUP BY result ) t1
INNER JOIN ( SELECT count( 1 ) s FROM sendsms_log ) t2 ON 1 = 1 
) t

其中“SELECT result, count( 1 ) n FROM sendsms_log GROUP BY result”是查出短信發送結果分組統計，“SELECT count( 1 ) s FROM sendsms_log”查出所有記錄數，round( n / s * 100, 5 )計算百分比，保留5位小數。效果：

result	n	rat
至尊	100	10%
總代	100	10%
市代	300	30%
分銷	500	50%