sql - 查询以将问题与来自两个不同表的选项结合起来？

Question

我有两个数据库表：

Definitions表具有以下列：

Id, Category

样本数据：

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

Options表具有以下列：

Id, DefinitionId, Value

样本数据：

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，我需要如下数据：

"", 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UNION ALL像这样使用：

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JOIN好像这样的两个表：

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

并且不要考虑在 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 小提琴演示

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

要按照您的要求显示数据，您还可以在 Excel 中使用诸如数据透视表之类的东西，并将您的数据库作为源。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