在MySQL中，如何在子查询中创建联接？

使用一个表格的工作样本

SELECT t.* FROM (
  SELECT
    TITLE.name, 
    (TITLE.value-TITLE.msp) AS Lower, 
    (TITLE.value+TITLE.msp) AS Upper,
    (TITLE.value) AS Value
  FROM TITLE 
) t
WHERE 98 BETWEEN t.Lower AND t.Upper
ORDER BY ABS(98 - t.Value) ASC
LIMIT 5

使用3张表的所需示例（需要修复/帮助）

我得到以下错误：

错误1054（42S22）：“where子句”中的未知列“ALBUM.ID”

---

查看您的查询：您正在定义一个名为

T

的子查询，它在表

标题

、

相册

和

体裁

之间进行查询然后从该子查询中选择，并尝试在

标题

、

专辑

和

流派

上应用

WHERE

子句。。。但是那些表不再在范围内了

请尝试以下方法：

SELECT t.* FROM (
  SELECT
    TITLE.name, ALBUM.year, GENRE.Type
    (TITLE.value-TITLE.msp) AS Lower, 
    (TITLE.value+TITLE.msp) AS Upper,
    (TITLE.value) AS Value
  FROM TITLE, ALBUM, GENRE 
  WHERE ALBUM.ID=GENRE.ID AND TITLE.ID=ALBUM.ID  
) t
WHERE 98 BETWEEN t.Lower AND t.Upper
ORDER BY ABS(98 - t.Value) ASC;

  SELECT
    TITLE.name, ALBUM.year, GENRE.Type
    (TITLE.value-TITLE.msp) AS Lower, 
    (TITLE.value+TITLE.msp) AS Upper,
    (TITLE.value) AS Value
  FROM TITLE
   JOIN ALBUM
    ON TITLE.ID=ALBUM.ID  
   JOIN GENRE 
    ON ALBUM.ID=GENRE.ID 
  WHERE 98 BETWEEN Lower AND Upper
  ORDER BY ABS(98 - Value) ASC;

---

查看您的查询：您正在定义一个名为

T

的子查询，它在表

标题

、

相册

和

体裁

之间进行查询然后从该子查询中选择，并尝试在

标题

、

专辑

和

流派

上应用

WHERE

子句。。。但是那些表不再在范围内了

请尝试以下方法：

SELECT t.* FROM (
  SELECT
    TITLE.name, ALBUM.year, GENRE.Type
    (TITLE.value-TITLE.msp) AS Lower, 
    (TITLE.value+TITLE.msp) AS Upper,
    (TITLE.value) AS Value
  FROM TITLE, ALBUM, GENRE 
  WHERE ALBUM.ID=GENRE.ID AND TITLE.ID=ALBUM.ID  
) t
WHERE 98 BETWEEN t.Lower AND t.Upper
ORDER BY ABS(98 - t.Value) ASC;

  SELECT
    TITLE.name, ALBUM.year, GENRE.Type
    (TITLE.value-TITLE.msp) AS Lower, 
    (TITLE.value+TITLE.msp) AS Upper,
    (TITLE.value) AS Value
  FROM TITLE
   JOIN ALBUM
    ON TITLE.ID=ALBUM.ID  
   JOIN GENRE 
    ON ALBUM.ID=GENRE.ID 
  WHERE 98 BETWEEN Lower AND Upper
  ORDER BY ABS(98 - Value) ASC;

---

这是合乎逻辑的：您的子查询创建一个表

t

，然后您尝试引用一个表

ALBUM

。没有

相册

，只有

t

最快的修复方法是在子查询中移动它所属连接的

WHERE

子句

SELECT t.* FROM (
  SELECT
    TITLE.name, ALBUM.year, GENRE.Type
    (TITLE.value-TITLE.msp) AS Lower, 
    (TITLE.value+TITLE.msp) AS Upper,
    (TITLE.value) AS Value
  FROM TITLE, ALBUM, GENRE 
  WHERE ALBUM.ID=GENRE.ID AND TITLE.ID=ALBUM.ID  
) t
WHERE 98 BETWEEN t.Lower AND t.Upper
ORDER BY ABS(98 - t.Value) ASC;

但是这个问题本身并没有那么美好。。。为什么不试试这个呢

SELECT t.* FROM (
  SELECT
    TITLE.name, ALBUM.year, GENRE.Type
    (TITLE.value-TITLE.msp) AS Lower, 
    (TITLE.value+TITLE.msp) AS Upper,
    (TITLE.value) AS Value
  FROM TITLE, ALBUM, GENRE 
  WHERE ALBUM.ID=GENRE.ID AND TITLE.ID=ALBUM.ID  
) t
WHERE 98 BETWEEN t.Lower AND t.Upper
ORDER BY ABS(98 - t.Value) ASC;

  SELECT
    TITLE.name, ALBUM.year, GENRE.Type
    (TITLE.value-TITLE.msp) AS Lower, 
    (TITLE.value+TITLE.msp) AS Upper,
    (TITLE.value) AS Value
  FROM TITLE
   JOIN ALBUM
    ON TITLE.ID=ALBUM.ID  
   JOIN GENRE 
    ON ALBUM.ID=GENRE.ID 
  WHERE 98 BETWEEN Lower AND Upper
  ORDER BY ABS(98 - Value) ASC;

• 删除了不必要的子查询
• 使用SQL-92样式联接而不是SQL-89样式联接（带where子句的笛卡尔乘积）

---

这是合乎逻辑的：您的子查询创建一个表

t

，然后您尝试引用一个表

相册

。没有

相册

，只有

t

最快的修复方法是在子查询中移动它所属连接的

WHERE

子句

SELECT t.* FROM (
  SELECT
    TITLE.name, ALBUM.year, GENRE.Type
    (TITLE.value-TITLE.msp) AS Lower, 
    (TITLE.value+TITLE.msp) AS Upper,
    (TITLE.value) AS Value
  FROM TITLE, ALBUM, GENRE 
  WHERE ALBUM.ID=GENRE.ID AND TITLE.ID=ALBUM.ID  
) t
WHERE 98 BETWEEN t.Lower AND t.Upper
ORDER BY ABS(98 - t.Value) ASC;

但是这个问题本身并没有那么美好。。。为什么不试试这个呢

SELECT t.* FROM (
  SELECT
    TITLE.name, ALBUM.year, GENRE.Type
    (TITLE.value-TITLE.msp) AS Lower, 
    (TITLE.value+TITLE.msp) AS Upper,
    (TITLE.value) AS Value
  FROM TITLE, ALBUM, GENRE 
  WHERE ALBUM.ID=GENRE.ID AND TITLE.ID=ALBUM.ID  
) t
WHERE 98 BETWEEN t.Lower AND t.Upper
ORDER BY ABS(98 - t.Value) ASC;

  SELECT
    TITLE.name, ALBUM.year, GENRE.Type
    (TITLE.value-TITLE.msp) AS Lower, 
    (TITLE.value+TITLE.msp) AS Upper,
    (TITLE.value) AS Value
  FROM TITLE
   JOIN ALBUM
    ON TITLE.ID=ALBUM.ID  
   JOIN GENRE 
    ON ALBUM.ID=GENRE.ID 
  WHERE 98 BETWEEN Lower AND Upper
  ORDER BY ABS(98 - Value) ASC;

• 删除了不必要的子查询
• 使用SQL-92样式联接而不是SQL-89样式联接（带where子句的笛卡尔乘积）

---

将WHERE子句移动到内部查询

SELECT t.* FROM (
  SELECT
    TITLE.name, ALBUM.year, GENRE.Type
    (TITLE.value-TITLE.msp) AS Lower, 
    (TITLE.value+TITLE.msp) AS Upper,
    (TITLE.value) AS Value
  FROM TITLE, ALBUM, GENRE 
  WHERE ALBUM.ID=GENRE.ID AND TITLE.ID=ALBUM.ID  
) t
AND 98 BETWEEN t.Lower AND t.Upper
ORDER BY ABS(98 - t.Value) ASC;

---

将WHERE子句移动到内部查询

SELECT t.* FROM (
  SELECT
    TITLE.name, ALBUM.year, GENRE.Type
    (TITLE.value-TITLE.msp) AS Lower, 
    (TITLE.value+TITLE.msp) AS Upper,
    (TITLE.value) AS Value
  FROM TITLE, ALBUM, GENRE 
  WHERE ALBUM.ID=GENRE.ID AND TITLE.ID=ALBUM.ID  
) t
AND 98 BETWEEN t.Lower AND t.Upper
ORDER BY ABS(98 - t.Value) ASC;

---

您的子查询（“t”）将返回标题、唱片集和流派的交叉连接结果集，其中不包括它们各自的ID值。WHERE子句只能对

t

的投影进行操作。您的子查询（“t”）将返回标题、唱片集和流派的交叉连接结果集，其中不包括它们各自的ID值。你的WHERE子句只能在

t

@Jammin我刚刚修正了他的“笛卡尔”拼写：）Konerak是这个答案的唯一责任人（我同意是最好的）。@Jammin我刚刚修正了他的“笛卡尔”拼写：）Konerak是这个答案的唯一责任人（我同意是最好的）。