LEFT JOIN SQL 不支持连接表达式

Question

我找不到这个 SQL 表达式有什么问题：

SELECT DISTINCT PNLTERM.TAGSTRIP, TERMS.TERM, PNLTERM.STRIPSEQ, TERMS.WIRENO, 
TERMS.REF, TERMS.MFG, TERMS.CAT, TERMS.BLOCK, PNLTERM.HDL, TERMS.WDBLKNAM, 
TERMS.JUMPER_ID, WIREFRM2.WIRELAY
FROM (PNLTERM LEFT JOIN TERMS ON PNLTERM.LINKTERM = TERMS.LINKTERM) 
INNER JOIN WIREFRM2 ON TERMS.HDL = WIREFRM2.COMP_HDL;

与PNLTERM/TERMS上的left join有关；因为它适用于内部连接和右连接，但不适用于左连接。错误是 'Join expression not supported'.

有什么想法吗？

Answer 1

MS Access 有一些关于使用 LEFT/RIGHT 连接和 INNER 连接的规则。具体来说，有一个关于它的组合的规则。解释 here:

A LEFT JOIN or a RIGHT JOIN may be nested inside an INNER JOIN, but an INNER JOIN may not be nested inside a LEFT JOIN or a RIGHT JOIN.

您有几个选择：您可以将第二个联接转换为左联接：

SELECT DISTINCT PNLTERM.TAGSTRIP, TERMS.TERM, PNLTERM.STRIPSEQ, TERMS.WIRENO, 
TERMS.REF, TERMS.MFG, TERMS.CAT, TERMS.BLOCK, PNLTERM.HDL, TERMS.WDBLKNAM, 
TERMS.JUMPER_ID, WIREFRM2.WIRELAY
FROM (PNLTERM LEFT JOIN TERMS ON PNLTERM.LINKTERM = TERMS.LINKTERM) 
LEFT JOIN WIREFRM2 ON TERMS.HDL = WIREFRM2.COMP_HDL;

或者，您可以更改查询，以便 INNER 联接在前：

SELECT DISTINCT PNLTERM.TAGSTRIP, TERMS.TERM, PNLTERM.STRIPSEQ, TERMS.WIRENO, 
TERMS.REF, TERMS.MFG, TERMS.CAT, TERMS.BLOCK, PNLTERM.HDL, TERMS.WDBLKNAM, 
TERMS.JUMPER_ID, WIREFRM2.WIRELAY
FROM (WIREFRM2 INNER JOIN TERMS ON TERMS.HDL = WIREFRM2.COMP_HDL) 
RIGHT JOIN PNLTERM ON PNLTERM.LINKTERM = TERMS.LINKTERM;

LEFT JOIN SQL 不支持连接表达式

LEFT JOIN SQL Join Expression not supported

sql

ms-access

join

left-join