显示歌手唱歌的所有歌曲列表＆＃39; Lungi Dance＆＃39;没有子查询

Question

嗨，我想找出由唱歌的歌手演唱的歌曲列表＆＃39; lungi dance＆＃39;歌曲。没有子查询就可以找到它。在下面的代码中，我能够显示属于歌手的歌曲名称，但是如何在不使用子查询的情况下通过它的歌曲名称找到歌手名称。

SELECT SongTitle
FROM Singer
INNER JOIN Songs ON Songs.Singer_id=Singer.Singer_id
WHERE Singer_Name='Bohemia'

Answer 1

是的，没有子查询（但是第二次加入）是可能的：

SELECT songsOut.SongsTitle
FROM Songs songsCompare
JOIN Singer singer ON (singer.id = songsCompare.Singer_id)
JOIN Songs songsOut ON (songsOut.Singer_id = singer.Singer_id)
WHERE lower(songsCompare.SongTitle) = 'lungi dance';

Answer 2

标题中的问题：

  

显示歌曲'Lungi'的歌手的所有歌曲列表   舞“

SELECT s3.SongTitle
FROM Singer s1
INNER JOIN Songs s2 ON s1.Singer_id = s2.Singer_id
INNER JOIN Songs s3 ON s2.Singer_id = s3.Singer_id
WHERE s2.SongTitle = 'lungi dance'

[DEMO]

原帖附近的问题：

  

如何在没有使用的情况下通过它的歌曲名称找到歌手的名字   子查询

您只需更改WHERE：

中的搜索条件即可

SELECT s1.Singer_name, s2.SongTitle
FROM Singer s1
INNER JOIN Songs s2 ON s1.Singer_id = s2.Singer_id
WHERE s2.SongTitle = 'lungi dance'

示例：

;WITH Singer (Singer_id, Singer_name) AS (
    SELECT 1, 'Bohemia' UNION ALL
    SELECT 2, 'Joe' UNION ALL
    SELECT 3, 'Sam')
, Songs (SongTitle, Singer_id) AS (
    SELECT 'lungi dance', 1 UNION ALL
    SELECT 'Joes Song', 2 UNION ALL
    SELECT 'Sams Song', 3 UNION ALL
    SELECT 'lungi love', 1 UNION ALL
    SELECT 'Joes Hit', 2)

SELECT s1.Singer_name, s2.SongTitle
FROM Singer s1
INNER JOIN Songs s2 ON s1.Singer_id = s2.Singer_id
WHERE s2.SongTitle = 'lungi dance'

现在您可以搜索多首歌曲，并返回歌手：

SELECT s1.Singer_name, s2.SongTitle
FROM Singer s1
INNER JOIN Songs s2 ON s1.Singer_id = s2.Singer_id
WHERE s2.SongTitle IN ('Joes Song', 'Joes Hit', 'lungi dance')