使用 SQLite 对另一个表中的多个列使用一个查找表

Question

通过 SQLite 对另一个表中的多个列使用一个查找表

我需要在表 SwitchLinkage（也带有 NA）中多次（多个引用）使用查找表 Switch（带有 NA）（仅为两个表提供选定的数据）。

表格：开关

SwitchID	Name	DefaultInputOutputSwitchAsgnCode	AccessibleForInput	AccessibleForOutput	Disp_ImageSetInstanceID
1380	T: Anches Pedal (Stop Screen)	2020			1380
1381	T: Anches Cornet (Stop Screen)	2120			1381
1382	T: Anches Bombarde (Stop Screen	2119			1382
1383	T: Anches Recit (Stop Screen)	2213			1383
1392	T: Tremolo (Stop Screen)	2214			1392
1393	T: TremoloGO.				1393
1394	T: TremoloBom				1394
1395	T: TremoloRec				1395
1493	T: TremoloGO.				1493
1494	T: TremoloBom				1494
1495	T: TremoloRec				1495
2080	T: Anches Pedal (Extend)		Y	Y	2080
2081	T: Anches Cornet (Extend)		Y	Y	2081
2082	T: Anches Bombarde (Extend)		Y	Y	2082
2083	T: Anches Recit (Extend)		Y	Y	2083
12080	T: Anches Pedal (Split Screen)		Y	Y	12080
12081	T: Anches Cornet (Split Screen)				12081
12082	T: Anches Bombarde (Split Scree				12082
12083	T: Anches Recit (Split Screen)				12083

表：SwitchLinkage

SourceSwitchID	DestSwitchID	ConditionSwitchID	SourceSwitchLinkIfEngaged	ConditionSwitchLinkIfEngaged	ReevaluateIfCondSwitchChangesState	EngageLinkActionCode	DisengageLinkActionCode
1380	12080		Y	N	Y	1	2
1381	12081		Y	N	Y	1	2
1382	12082		Y	N	Y	1	2
1383	12083		Y	N	Y	1	2
1393	1493	1392	Y	Y	Y	1	2
1394	1494	1392	Y	Y	Y	1	2
1395	1495	1392	Y	Y	Y	1	2
2080	11080		Y	N	Y	1	2
2081	11081		Y	N	Y	1	2
2082	11082		Y	N	Y	1	2
2083	11083		Y	N	Y	1	2
12080	1380		Y	N	Y	1	2
12081	1381		Y	N	Y	1	2
12082	1382		Y	N	Y	1	2
12083	1383		Y	N	Y	1	2

在表 SwitchLinkage 中： (SourceSwitchID) 参考开关 (SwitchID) (DestSwitchID) 参考开关 (SwitchID) (ConditionSwitchID) REFERENCES 开关 (SwitchID)

我提供了一个示例，说明我想在表格 Final 中实现什么。应根据输入表允许 NA。

表格：最终

SourceSwitchID	Name_SourceSwitch	AsgnCode_SourceSwitch	DestSwitchID	Name_DestSwitch	AsgnCode_DestSwitch	ConditionSwitchID	Name_ConditionSwitch	AsgnCode_ConditionSwitch	SourceSwitchLinkIfEngaged	EngageLinkActionCode	DisengageLinkActionCode
1380	T: Anches Pedal (Stop Screen)	2020	12080	T: Anches Pedal (Split Screen)					Y	1	2
1381	T: Anches Cornet (Stop Screen)	2120	12081	T: Anches Cornet (Split Screen)					Y	1	2
1382	T: Anches Bombarde (Stop Screen	2119	12082	T: Anches Bombarde (Split Scree					Y	1	2
1383	T: Anches Recit (Stop Screen)	2213	12083	T: Anches Recit (Split Screen)					Y	1	2
1393	T: TremoloGO.		1493	T: TremoloGO.		1392	T: Tremolo (Stop Screen)	2214	Y	1	2
1394	T: TremoloBom		1494	T: TremoloBom		1392	T: Tremolo (Stop Screen)	2214	Y	1	2
1395	T: TremoloRec		1495	T: TremoloRec		1392	T: Tremolo (Stop Screen)	2214	Y	1	2
2080	T: Anches Pedal (Extend)		11080						Y	1	2
2081	T: Anches Cornet (Extend)		11081						Y	1	2
2082	T: Anches Bombarde (Extend)		11082						Y	1	2
2083	T: Anches Recit (Extend)		11083						Y	1	2
12080	T: Anches Pedal (Split Screen)		1380	T: Anches Pedal (Stop Screen)	2020				Y	1	2
12081	T: Anches Cornet (Split Screen)		1381	T: Anches Cornet (Stop Screen)	2120				Y	1	2
12082	T: Anches Bombarde (Split Scree		1382	T: Anches Bombarde (Stop Screen	2119				Y	1	2
12083	T: Anches Recit (Split Screen)		1383	T: Anches Recit (Stop Screen)	2213				Y	1	2

我不知道该怎么做，希望得到任何形式的帮助。

Answer 1

这是一个仅包含部分数据和几列的示例。 它只是每个Switch 和Linkage 表之间的outer join / LEFT JOIN。任何缺失的链接只会在相应列的结果中生成NULL。

根据需要使用派生列名来调整结果中的列。

不清楚你问的还有没有其他逻辑。

测试用例：

Working Test Case for sqlite

SQL：

SELECT s1.SwitchID, s1.Name, s1.DefaultInputOutputSwitchAsgnCode AS SwitchAsgnCode
     , s2.SwitchID, s2.Name, s2.DefaultInputOutputSwitchAsgnCode AS SwitchAsgnCode
     , s3.SwitchID, s3.Name, s3.DefaultInputOutputSwitchAsgnCode AS SwitchAsgnCode
  FROM SwitchLinkage           AS sw
  LEFT JOIN Switch             AS s1
    ON sw.SourceSwitchID      = s1.SwitchID
  LEFT JOIN Switch             AS s2
    ON sw.DestSwitchID        = s2.SwitchID
  LEFT JOIN Switch             AS s3
    ON sw.ConditionSwitchID   = s3.SwitchID
 ORDER BY s1.SwitchID
;

结果：

+----------+---------------------------------+----------------+----------+---------------------------------+----------------+----------+--------------------------+----------------+
| SwitchID | Name                            | SwitchAsgnCode | SwitchID | Name                            | SwitchAsgnCode | SwitchID | Name                     | SwitchAsgnCode |
+----------+---------------------------------+----------------+----------+---------------------------------+----------------+----------+--------------------------+----------------+
|     1380 | T: Anches Pedal (Stop Screen)   |           2020 |    12080 | T: Anches Pedal (Split Screen)  |           NULL |     NULL | NULL                     |           NULL |
|     1381 | T: Anches Cornet (Stop Screen)  |           2120 |    12081 | T: Anches Cornet (Split Screen) |           NULL |     NULL | NULL                     |           NULL |
|     1382 | T: Anches Bombarde (Stop Screen |           2119 |    12082 | T: Anches Bombarde (Split Scree |           NULL |     NULL | NULL                     |           NULL |
|     1393 | T: TremoloGO.                   |           NULL |     1493 | T: TremoloGO.                   |           NULL |     1392 | T: Tremolo (Stop Screen) |           2214 |
|     1394 | T: TremoloBom                   |           NULL |     1494 | T: TremoloBom                   |           NULL |     1392 | T: Tremolo (Stop Screen) |           2214 |
|     1395 | T: TremoloRec                   |           NULL |     1495 | T: TremoloRec                   |           NULL |     1392 | T: Tremolo (Stop Screen) |           2214 |
+----------+---------------------------------+----------------+----------+---------------------------------+----------------+----------+--------------------------+----------------+