将预先连接的表与另一个表合并答案

【问题标题】：Combine pre-joined tables with another table将预先连接的表与另一个表合并
【发布时间】：2012-01-07 00:28:36
【问题描述】：

我正在尝试将预先加入的表与另一个表并排加入，但它似乎不起作用。

代码如下：

SELECT
  r.domainid,
  r.dombegin AS DomainStart,
  r.domend AS Domain_End,
  d.ddid,
  d.confid1 AS confid,
  c.pdbcode,
  c.chainid,
  a.pdbcode AS "cath_pdbcode", 
  c.pdbcode
FROM dyn_dyndomrun d, cath_domains a
  INNER JOIN dyn_conformer c ON d.confid1 = c.id
  INNER JOIN dyn_domainregion r ON r.domainid::varchar(8) = d.ddid
  INNER JOIN dyn_conformer AS c ON a.pdbcode::character(4) = c.pdbcode
UNION ALL
SELECT
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  d.ddid,
  d.confid2,
  c.pdbcode,
  c.chainid
FROM dyn_dyndomrun d 
  INNER JOIN dyn_conformer c ON d.confid2 = c.id
  ORDER BY confid ASC

这一行有问题

FROM dyn_dyndomrun d, cath_domains a
      INNER JOIN dyn_conformer c ON d.confid1 = c.id
      INNER JOIN dyn_domainregion r ON r.domainid::varchar(8) = d.ddid
      INNER JOIN dyn_conformer AS c ON a.pdbcode::character(4) = c.pdbcode

这是错误：

ERROR:  invalid reference to FROM-clause entry for table "d"
LINE 11:   INNER JOIN dyn_conformer c ON d.confid1 = c.id
                                         ^
HINT:  There is an entry for table "d", but it cannot be referenced from this part of the query.


********** Error **********

ERROR: invalid reference to FROM-clause entry for table "d"
SQL state: 42P01
Hint: There is an entry for table "d", but it cannot be referenced from this part of the query.
Character: 236

最后，我想要一个包含"domainid, domainstart, domainend, ddid, confid, chainid, pdbcode from conformer and the chain id" 的表，除此之外，我还想要另一个表中的一组新列，例如"pdbcode from cath_domains, cathbegin, cathend"。

conformer 和 cath_domains 的 pdbcode 相互匹配，因此我想交叉引用它们。

我做错了吗？

【问题讨论】：

关心发布您遇到的错误？
ERROR: invalid reference to FROM-clause entry for table "d" LINE 11: INNER JOIN dyn_conformer c ON d.confid1 = c.id ^ HINT: There is an entry for table "d", but it cannot be referenced from this part of the query. ********** Error ********** ERROR: invalid reference to FROM-clause entry for table "d" SQL state: 42P01 Hint: There is an entry for table "d", but it cannot be referenced from this part of the query. Character: 236
尝试使用唯一别名。您的查询定义了表 d 两次。
尝试更改您的 second from 子句。 FROM dyn_dyndomrun d2等
可能是因为您从两个基表中进行选择。使用两个表之一启动您的 FROM，并在另一个表中进行 INNER JOIN。

标签： sql postgresql join inner-join union-all

【解决方案1】：

停止执行隐式交叉连接。同样正如 ypercube 指出的那样，需要清理其他一些小东西，尤其是删除重复的连接。

SELECT
  r.domainid,
  r.dombegin AS DomainStart,
  r.domend AS Domain_End,
  d.ddid,
  d.confid1 AS confid,
  c.pdbcode,
  c.chainid,
  a.pdbcode AS "cath_pdbcode", 
  c.pdbcode
FROM dyn_dyndomrun d
  INNER JOIN dyn_conformer c ON d.confid1 = c.id 
  INNER JOIN dyn_domainregion r ON r.domainid::varchar(8) = d.ddid
  INNER JOIN cath_domains a ON a.pdbcode::character(4) = c.pdbcode
UNION ALL
SELECT
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  d.ddid,
  d.confid2,
  c.pdbcode,
  c.chainid
FROM dyn_dyndomrun d 
  INNER JOIN dyn_conformer c ON d.confid2 = c.id
  ORDER BY confid ASC

【讨论】：