sql - 如何划分嵌套查询的两个结果

Question

如何划分嵌套查询的两个结果？我的意思是：我有一个存储过程

SELECT s.sheep_id,
       ( s.sheepThatHadBirth / ( s.sheepThatHadBirth + s1.sheepThatNotHadBirth ) ) * 100
FROM   (SELECT sheep_id,
               Count(*) AS sheepThatHadBirth
        FROM   FemaleSheep_Has_Wave
        WHERE  pregnencies_succeded = 1
        GROUP  BY sheep_id)AS s
       CROSS JOIN (SELECT sheep_id,
                          Count(*) AS sheepThatNotHadBirth
                   FROM   FemaleSheep_Has_Wave
                   WHERE  pregnencies_succeded = 0
                   GROUP  BY sheep_id)AS s1 

结果不正确，因为交叉加入我想请帮助谢谢

Answer 1

JOIN你在这里根本不需要

SELECT sheep_id,
       100.0 * Sum(CASE
                     WHEN pregnencies_succeded = 1 THEN 1
                     ELSE 0
                   END) / Count(*) AS pregnencies_succeded_pct
FROM   FemaleSheep_Has_Wave
GROUP  BY sheep_id