选择多个联接 包括带有自己的联接的 LISTAGG

Question

我有以下两个查询，单独运行时可以完美工作。

查询1

SELECT eps.PROPOSAL_NUMBER, eps.TITLE, per.FULL_NAME, ext.NRP_IREF_CD, ext.RESEARCH_TYPE_CD, 
nsf.NSF_CODE, ext.NPS_THRUST_DESCRIPTION,
CASE
WHEN OPTION_1 = 'Y' THEN 'Option 1'
WHEN OPTION_2 = 'Y' THEN 'Option 2'
WHEN OPTION_3 = 'Y' THEN 'Option 3'
WHEN OPTION_4 = 'Y' THEN 'Option 4'
WHEN OPTION_5 = 'Y' THEN 'Option 5'
WHEN OPTION_6 = 'Y' THEN 'Option 6'
WHEN OPTION_7 = 'Y' THEN 'Option 7'
WHEN OPTION_8 = 'Y' THEN 'Option 8'
WHEN OPTION_9 = 'Y' THEN 'Option 9' 
WHEN OPTION_0 = 'Y' THEN 'Not Applicable'
ELSE ''
END ONR,       
abs.ABSTRACT_DETAILS
FROM EPS_PROPOSAL eps
LEFT JOIN EPS_PROPOSAL_EXT_T ext
ON eps.PROPOSAL_NUMBER = ext.PROPOSAL_NUMBER
LEFT JOIN EPS_PROP_PERSON per
ON eps.PROPOSAL_NUMBER = per.PROPOSAL_NUMBER AND
(per.PROP_PERSON_ROLE_ID = 'PI' OR per.PROP_PERSON_ROLE_ID = 'PD')
LEFT JOIN EPS_PROP_ABSTRACT abs
ON eps.PROPOSAL_NUMBER = abs.PROPOSAL_NUMBER
LEFT JOIN NSF_CODES nsf
ON eps.NSF_CODE = nsf.NSF_SEQUENCE_NUMBER    
WHERE eps.OWNED_BY_UNIT = '401' AND eps.requested_start_date_initial >= DATE '2019-10-01';

结果

--------
PROPOSAL_NUMBER    TITLE    FULL_NAME    NRP_IREF_CD ... <br />
2028          blah       ...           ....         <br />
2029          blah2      ...           ....         <br />
2030          blah3      ...           ....         <br />

查询2

SELECT eps.PROPOSAL_NUMBER,
LISTAGG(sk.DESCRIPTION, ', ') WITHIN GROUP (ORDER BY sk.DESCRIPTION) AS KEYWORDS 
FROM EPS_PROPOSAL eps
LEFT JOIN EPS_PROP_SCIENCE_KEYWORD key 
ON eps.PROPOSAL_NUMBER = key.PROPOSAL_NUMBER
LEFT JOIN SCIENCE_KEYWORD sk
ON key.SCIENCE_KEYWORD_CODE = sk.SCIENCE_KEYWORD_CODE
GROUP BY eps.PROPOSAL_NUMBER;

结果

--------
PROPOSAL_NUMBER    KEYWORDS
2028          Keyword_A, Keyword_B, Keyword_C, Keyword_D
2029          Keyword_Y, Keyword_Z
2030          Keyword_W

你可以看到，我正在处理的主表是EPS_PROPOSAL，PK是PROPOSAL_NUMBER。还有其他表将该PK用作FK，如EPS_PROP_SCIENCE_KEYWORD，其中可以有多行KEYWORD映射到同一PROOSAL_NUMBER。问题是，只有ID或代码存储在该表上，因此需要与SCIENCE_KEYWORD表JOIN才能获得描述。

问题：我如何将这两个查询组合起来，使我的结果看起来像这样：

Results
--------
PROPOSAL_NUMBER    TITLE    FULL_NAME    NRP_IREF_CD ...  KEYWORDS
2028          blah       ...           ....           Keyword_A, Keyword_B, Keyword_C, Keyword_D
2029          blah2      ...           ....           Keyword_Y, Keyword_Z
2030          blah3      ...           ....           Keyword_W

Answer 1

最简单的方法是进行小的修改-使用子查询添加OUTER APPLY：

SELECT eps.PROPOSAL_NUMBER, eps.TITLE, per.FULL_NAME, ext.NRP_IREF_CD, ext.RESEARCH_TYPE_CD, 
nsf.NSF_CODE, ext.NPS_THRUST_DESCRIPTION,
CASE
WHEN OPTION_1 = 'Y' THEN 'Option 1'
WHEN OPTION_2 = 'Y' THEN 'Option 2'
WHEN OPTION_3 = 'Y' THEN 'Option 3'
WHEN OPTION_4 = 'Y' THEN 'Option 4'
WHEN OPTION_5 = 'Y' THEN 'Option 5'
WHEN OPTION_6 = 'Y' THEN 'Option 6'
WHEN OPTION_7 = 'Y' THEN 'Option 7'
WHEN OPTION_8 = 'Y' THEN 'Option 8'
WHEN OPTION_9 = 'Y' THEN 'Option 9' 
WHEN OPTION_0 = 'Y' THEN 'Not Applicable'
ELSE ''
END ONR,       
abs.ABSTRACT_DETAILS,
k.keywords
FROM EPS_PROPOSAL eps
LEFT JOIN EPS_PROPOSAL_EXT_T ext
ON eps.PROPOSAL_NUMBER = ext.PROPOSAL_NUMBER
LEFT JOIN EPS_PROP_PERSON per
ON eps.PROPOSAL_NUMBER = per.PROPOSAL_NUMBER AND
(per.PROP_PERSON_ROLE_ID = 'PI' OR per.PROP_PERSON_ROLE_ID = 'PD')
LEFT JOIN EPS_PROP_ABSTRACT abs
ON eps.PROPOSAL_NUMBER = abs.PROPOSAL_NUMBER
LEFT JOIN NSF_CODES nsf
ON eps.NSF_CODE = nsf.NSF_SEQUENCE_NUMBER    
OUTER APPLY(
SELECT 
LISTAGG(sk.DESCRIPTION, ', ') WITHIN GROUP (ORDER BY sk.DESCRIPTION) AS KEYWORDS 
FROM EPS_PROP_SCIENCE_KEYWORD key 
LEFT JOIN SCIENCE_KEYWORD sk
ON key.SCIENCE_KEYWORD_CODE = sk.SCIENCE_KEYWORD_CODE
WHERE eps.PROPOSAL_NUMBER = key.PROPOSAL_NUMBER
) k
WHERE eps.OWNED_BY_UNIT = '401' AND eps.requested_start_date_initial >= DATE '2019-10-01';

Answer 2

一个选项是使用通用表表达式：

WITH Q1 AS
(
SELECT eps.PROPOSAL_NUMBER, eps.TITLE, per.FULL_NAME, ext.NRP_IREF_CD, ext.RESEARCH_TYPE_CD, 
nsf.NSF_CODE, ext.NPS_THRUST_DESCRIPTION,
CASE
WHEN OPTION_1 = 'Y' THEN 'Option 1'
WHEN OPTION_2 = 'Y' THEN 'Option 2'
WHEN OPTION_3 = 'Y' THEN 'Option 3'
WHEN OPTION_4 = 'Y' THEN 'Option 4'
WHEN OPTION_5 = 'Y' THEN 'Option 5'
WHEN OPTION_6 = 'Y' THEN 'Option 6'
WHEN OPTION_7 = 'Y' THEN 'Option 7'
WHEN OPTION_8 = 'Y' THEN 'Option 8'
WHEN OPTION_9 = 'Y' THEN 'Option 9' 
WHEN OPTION_0 = 'Y' THEN 'Not Applicable'
ELSE ''
END ONR,       
abs.ABSTRACT_DETAILS
FROM EPS_PROPOSAL eps
LEFT JOIN EPS_PROPOSAL_EXT_T ext
ON eps.PROPOSAL_NUMBER = ext.PROPOSAL_NUMBER
LEFT JOIN EPS_PROP_PERSON per
ON eps.PROPOSAL_NUMBER = per.PROPOSAL_NUMBER AND
(per.PROP_PERSON_ROLE_ID = 'PI' OR per.PROP_PERSON_ROLE_ID = 'PD')
LEFT JOIN EPS_PROP_ABSTRACT abs
ON eps.PROPOSAL_NUMBER = abs.PROPOSAL_NUMBER
LEFT JOIN NSF_CODES nsf
ON eps.NSF_CODE = nsf.NSF_SEQUENCE_NUMBER    
WHERE eps.OWNED_BY_UNIT = '401' AND eps.requested_start_date_initial >= DATE'2019-10-01' 
), Q2 AS
(
SELECT eps.PROPOSAL_NUMBER,
LISTAGG(sk.DESCRIPTION, ', ') WITHIN GROUP(ORDER BY sk.DESCRIPTION) AS KEYWORDS
FROM EPS_PROPOSAL eps
LEFT JOIN EPS_PROP_SCIENCE_KEYWORD key
ON eps.PROPOSAL_NUMBER = key.PROPOSAL_NUMBER
LEFT JOIN SCIENCE_KEYWORD sk
ON key.SCIENCE_KEYWORD_CODE = sk.SCIENCE_KEYWORD_CODE
GROUP BY eps.PROPOSAL_NUMBER
)
SELECT Q1.*, Q2.KEYWORDS
FROM Q1
JOIN Q2
ON Q2.PROPOSAL_NUMBER = Q1.PROPOSAL_NUMBER