Question

在我的表格中，我有3列SubmissionId, FieldName, FieldValue。我有一个问题：

SELECT SubmissionId, FieldName, FieldValue 
FROM myTable 
WHERE (FieldValue = "Soccer") 
  OR (FieldValue = "Main Hall") 
  OR (FieldValue = "August 23, 2017")

返回以下内容：

SubmissionId | FieldName | fieldValue方法

     1508        | ClassLocation |  Main Hall
     1509        | EventName     |  Soccer
     1512        | EventName     |  Soccer
     1516        | ClassLocation |  Main Hall
     1520        | EventName     |  Soccer
     1520        | EventDate     |  August 23, 2017
     1520        | ClassLocation |  Main Hall
     1523        | EventName     |  Soccer
     1524        | EventName     |  Soccer
     1525        | ClassLocation |  Main Hall
     1538        | EventName     |  Soccer
     1539        | EventName     |  Soccer
     1539        | EventDate     |  August 23, 2017
     1539        | ClassLocation |  Main Hall
     1540        | ClassLocation |  Main Hall
     1550        | ClassLocation |  Main Hall

我现在正在尝试找出添加到此查询的最佳方法，以便我只能从SubmissionId列中获取三次重复自己的字段值，在这种情况下，它将是提交ID，是1520年和1539年。在此先感谢您的帮助，我已经有一段时间难过了。

Answer 1

尝试：

SELECT SubmissionId, COUNT(SubmissionId) 
FROM YourTable 
GROUP BY SubmissionId 
HAVING COUNT(SubmissionId) = 3

Answer 2

SELECT SubmissionId
FROM myTable 
WHERE FieldValue in ('Soccer','Main Hall', 'August 23, 2017')
GROUP BY SubmissionID
HAVING count(Distinct fieldName) = 3

我使用不同的incase fieldValue可以重复给定的submissionID。

你也可以绑定FieldName，以确保配对的映射

WHERE (FieldName, FieldValue) in (('EventName','Soccer'),('ClassLocation','Main Hall'),('EventDate','August 23, 2017'))

Answer 3

只需将当前查询用作聚合的子查询

SELECT SubmissionId
FROM ( SELECT SubmissionId, FieldName, FieldValue 
       FROM myTable 
       WHERE FieldValue IN ( "Soccer", "Main Hall", "August 23, 2017")
     ) as T
GROUP BY SubmissionId
HAVING COUNT(*) = 3

根据另一列的字段值选择具有相同列值的行

SubmissionId | FieldName | fieldValue方法

3 个答案: