Question

我有两个数据库表：

Definitions表包含以下列：

Id, Category

示例数据：

1, What is capital of USA ?
2, Who broke my glass ?

Options表包含以下列：

Id, DefinitionId, Value

示例数据：

1, 1, New York
2, 1, Melbourne
3, 1, Lahore
4, 2, Boss
5, 2, My brother
6, 2, Your girlfriend

请指导我如何使用所有选项查询所有问题，我需要以下数据：

"", 1, What is capital of USA ?
1,1, New York
2,1, Melbourne
3, 1, Lahore

"", 2,Who broke my glass ?
4, 2, Boss
5, 2, My brother
6, 2, Your girlfriend

请指导

Answer 1

为此，请使用UNION ALL，如下所示：

SELECT '' ID, DefinitionId, Category AS value FROM Definitions WHERE ID = 1
UNION ALL
SELECT Id, DefinitionId, Value FROM Options WEHRE DefentionID = 1;

请注意：最好JOIN这两个表如下：

SELECT 
  d.Id,
  o.Id,
  o.Value
FROM Definitions d
INNER JOIN Options o ON d.ID = o.DefinitionId
WHERE d.Id = 1;

不要考虑在SQL中进行这种格式化;

更新：要获得所有问题，请尝试以下操作：

SELECT '' ID, ID AS DefinitionId, Category AS value FROM Definitions 
UNION ALL
SELECT Id, DefinitionId, Value FROM Options
ORDER BY DEFINITIONID, ID;

SQL Fiddle Demo

这会给你：

| ID | DEFINITIONID |                    VALUE |
------------------------------------------------
|  0 |            1 | What is capital of USA ? |
|  1 |            1 |                 New York |
|  2 |            1 |                Melbourne |
|  3 |            1 |                   Lahore |
|  0 |            2 |     Who broke my glass ? |
|  4 |            2 |                     Boss |
|  5 |            2 |               My brother |
|  6 |            2 |          Your girlfriend |

Answer 2

要像您要求的那样显示您的数据，您还可以使用Excel中的数据透视表和数据库作为源。这也适用于Sql Server Analysis Services。

Answer 3

SELECT ' ',D.ID,D.category from Definitions D where D.Id = 1
UNION 
SELECT C.ID,C.DefinitionId,C.Value from options C where C.DefinitionId=1

Answer 4

SELECT  NULL,D.Id,D.Category
FROM    Definitions D
UNION
SELECT  O.Id,O.DefinitionId,O.Value
FROM    Options O
ORDER BY 2,1

查询将问题与来自两个不同表格的选项相结合？

4 个答案:

SQL Fiddle Demo