Question

您好我有以下sql语句，用于精细链接四个表。表格是Person（c，e），Relation（d），PersonFamily（b），Family（a）。我添加条件WHERE d.Relationship LIKE'％Father'因为我想过滤那个特定的关系所以它只检索（c）的数据，如果这个关系是父亲，继父，祖父等等。一旦我添加了这个，它失败 - 我没有设法找到具有多个条件的示例，因为我需要为母亲添加另一个条件，但我希望它出现在f.Title，f.Forename，f.Surname下的同一行中。

我想如果我能理解如何在sql中执行多重操作，我可能也可以检索出母数据

SELECT a.pk_FamilyID, a.Salutation, e.Title, e.Forename, e.Surname, c.Title, c.Forename, c.Surname
FROM Family a
INNER JOIN PersonFamily b ON a.pk_FamilyID = b.fk_FamilyID
INNER JOIN Person c ON b.fk_PersonID = c.pk_PersonID
INNER JOIN Relation d ON c.pk_PersonID = d.fk_RelatedPersonID
WHERE d.Relationship LIKE '%Father'
INNER JOIN Person e ON d.fk_PersonID = e.pk_PersonID
WHERE e.pk_PersonID IN('" & Substitute ( ListOfPersonUUID ; ¶ ; "','" ) & "')
ORDER BY e.SurnameForename ASC

Answer 1

您可以在使用AND/OR运算符的位置添加多个条件，以满足您的要求。在这种情况下，您可能需要使用AND运算符。我假设您希望获得结果，如果%Father OR %Mother中存在关系，那么为什么在部分中添加(d.Relationship LIKE '%Father' OR d.Relationship LIKE '%Mother')条件。

SELECT a.pk_FamilyID, a.Salutation, e.Title, e.Forename, e.Surname, c.Title, c.Forename, c.Surname
FROM Family a
INNER JOIN PersonFamily b ON a.pk_FamilyID = b.fk_FamilyID
INNER JOIN Person c ON b.fk_PersonID = c.pk_PersonID
INNER JOIN Relation d ON c.pk_PersonID = d.fk_RelatedPersonID
INNER JOIN Person e ON d.fk_PersonID = e.pk_PersonID
WHERE (d.Relationship LIKE '%Father' OR d.Relationship LIKE '%Mother')
AND e.pk_PersonID IN('" & Substitute ( ListOfPersonUUID ; ¶ ; "','" ) & "')
ORDER BY e.SurnameForename ASC

Answer 2

您不能在同一数据集上拥有多个WHERE子句。条件需要由AND，OR之类的逻辑运算符分隔，或者您需要将WHERE放在数据集中。

你可以拥有：

SELECT a.pk_FamilyID, a.Salutation, e.Title, e.Forename, e.Surname, c.Title, c.Forename, c.Surname
FROM Family a
INNER JOIN PersonFamily b ON a.pk_FamilyID = b.fk_FamilyID
INNER JOIN Person c ON b.fk_PersonID = c.pk_PersonID
INNER JOIN (SELECT * FROM Relation d WHERE Relationship LIKE '%Father')ON c.pk_PersonID = d.fk_RelatedPersonID
INNER JOIN (SELECT * FROM Person WHERE pk_PersonID IN('" & Substitute ( ListOfPersonUUID ; ¶ ; "','" ) & "'))e ON d.fk_PersonID = e.pk_PersonID
ORDER BY e.SurnameForename

SQL连接四个表中的数据，其中有多个

2 个答案: