嵌套 select 并加入
Nested select and joins
我使用下面的代码从其他表中计算出所需的信息。我使用联接来显示名称而不是 ID，并从其他表中获取所需的总和。我使用 COALESCE 将 null 转换为零。
如果我需要对已经合并的值求和，我不得不再次使用它，上面的代码很难理解，而且越来越难，因为我需要添加更多信息，这只是主要项目的一小部分所以使用它真的很难，而且会有很多错误和错误。
有必要这么复杂吗？还是我做错了？如果它必须像这样复杂，是否有任何替代方法可以用更简单的方法和代码获得相同的结果？另一个 RDBMS 还是其他？
SELECT P.PROJ_ID, P.PROJ_STATUS, P.TYPE_ID, PT.TYPE_NAME, P.CLASS_ID, CLA.CLASS_NAME, P.PROJ_NO, P.PROJ_YEAR, P.PROJ_NAME, P.OLD_PROJ_NAME,
P.AGENCY_ID, A.AGENCY_NAME, P.CONTRACT_NO, P.CONTRACT_DATE, P.MINISTRY_ID, M.MINISTRY_NAME,
P.DIRECTORATE_ID, DIR.DIRECTORATE_NAME,
P.COST, P.ESTIMATED_COST, COALESCE(CO.ADDED_COSTS, 0) AS ADDED_COSTS, (COALESCE(P.COST, 0) + COALESCE(CO.ADDED_COSTS, 0)) AS TOTAL_COST,
P.ALLOCATION,
COALESCE(EPY.PAST_YEARS, 0) AS PAST_YEARS,
COALESCE(EF.PAST_MONTHS, 0) AS PAST_MONTHS,
COALESCE(ECM.CURRENT_MONTH, 0) AS CURRENT_MONTH,
COALESCE(ECY.CURRENT_YEAR, 0) AS CURRENT_YEAR,
COALESCE(E.TOTAL_EXPENSES, 0) AS TOTAL_EXPENSES,
COALESCE(CASH_EPY.CASH_PAST_YEARS, 0) AS CASH_PAST_YEARS,
COALESCE(CASH_EF.CASH_PAST_MONTHS, 0) AS CASH_PAST_MONTHS,
COALESCE(CASH_ECM.CASH_CURRENT_MONTH, 0) AS CASH_CURRENT_MONTH,
COALESCE(CASH_ECY.CASH_CURRENT_YEAR, 0) AS CASH_CURRENT_YEAR,
COALESCE(CASH_E.CASH_TOTAL_EXPENSES, 0) AS CASH_TOTAL_EXPENSES,
COALESCE(TOTAL_E.TOTAL_EXPENSES_CASH, 0) AS TOTAL_EXPENSES_CASH,
((COALESCE(P.COST, 0) + COALESCE(CO.ADDED_COSTS, 0)) - COALESCE(E.TOTAL_EXPENSES, 0)) AS REMAINING,
P.DURATION, COALESCE(DU.ADDED_DURATIONS, 0) AS ADDED_DURATIONS,
(COALESCE(P.DURATION, 0) + COALESCE(DU.ADDED_DURATIONS, 0)) AS TOTAL_DURATION, P.START_DATE, P.FINISH_DATE,
P.GOVERNORATE_ID, G.GOVERNORATE_NAME, P.PROVINCE_ID, PR.PROVINCE_NAME, P.DISTRICT_ID, D.DISTRICT_NAME,
P.TOWN_ID, T.TOWN_NAME,
COALESCE( (E.TOTAL_EXPENSES / (COALESCE(P.COST, 0) + COALESCE(CO.ADDED_COSTS, 0)))/100, 0) AS FINANCIAL_ACHIEVEMENT,
P.MATERIAL_ACHIEVEMENT, P.NOTES
FROM PROJECTS P
INNER JOIN PROJECTS_TYPES PT
ON P.TYPE_ID = PT.TYPE_ID
INNER JOIN CLASSES CLA
ON P.CLASS_ID = CLA.CLASS_ID
INNER JOIN AGENCIES A
ON P.AGENCY_ID = A.AGENCY_ID
LEFT JOIN MINISTRIES M
ON P.MINISTRY_ID = M.MINISTRY_ID
LEFT JOIN DIRECTORATES DIR
ON P.DIRECTORATE_ID = DIR.DIRECTORATE_ID
INNER JOIN GOVERNORATES G
ON P.GOVERNORATE_ID = G.GOVERNORATE_ID
LEFT JOIN PROVINCES PR
ON P.PROVINCE_ID = PR.PROVINCE_ID
LEFT JOIN DISTRICTS D
ON P.DISTRICT_ID = D.DISTRICT_ID
LEFT JOIN TOWNS T
ON P.TOWN_ID = T.TOWN_ID
-- ADDED COSTS
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(ADDED_VALUE, 0) - COALESCE(REMOVED_VALUE, 0)) as ADDED_COSTS
FROM COSTS
GROUP BY PROJ_ID ) AS CO
ON P.PROJ_ID = CO.PROJ_ID
-- EXPENSES FROM PAST YEARS
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(TOTAL_VALUE, 0)) as PAST_YEARS
FROM EXPENSES WHERE EXTRACT(YEAR FROM DOC_DATE) < EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = FALSE
GROUP BY PROJ_ID ) AS EPY
ON P.PROJ_ID= EPY.PROJ_ID
-- EXPENSES FROM PAST MONTHS IN CUREENT YEAR
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(TOTAL_VALUE, 0)) as PAST_MONTHS
FROM EXPENSES WHERE EXTRACT(MONTH FROM DOC_DATE) < EXTRACT(MONTH FROM CURRENT_DATE)
AND EXTRACT(YEAR FROM DOC_DATE) = EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = FALSE
GROUP BY PROJ_ID ) AS EF
ON P.PROJ_ID= EF.PROJ_ID
-- EXPENSES FROM CURRENT MONTH AND YEAR
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(TOTAL_VALUE, 0)) as CURRENT_MONTH
FROM EXPENSES WHERE EXTRACT(MONTH FROM DOC_DATE) = EXTRACT(MONTH FROM CURRENT_DATE) AND EXTRACT(YEAR FROM DOC_DATE) = EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = FALSE
GROUP BY PROJ_ID ) AS ECM
ON P.PROJ_ID= ECM.PROJ_ID
-- SUM OF EXPENSES IN CURRENT YEAR
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(TOTAL_VALUE, 0)) as CURRENT_YEAR
FROM EXPENSES WHERE EXTRACT(YEAR FROM DOC_DATE) = EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = FALSE
GROUP BY PROJ_ID ) AS ECY
ON P.PROJ_ID= ECY.PROJ_ID
-- TOTAL EXPENSES FROM ALL TIME
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(TOTAL_VALUE, 0)) as TOTAL_EXPENSES
FROM EXPENSES WHERE CASH_DEDUCTIONS = FALSE
GROUP BY PROJ_ID ) AS E
ON P.PROJ_ID= E.PROJ_ID
-- CASH DEDUCTIONS SUMS
-- CASH DEDUCTIONS FROM PAST YEARS
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(TOTAL_VALUE, 0)) as CASH_PAST_YEARS
FROM EXPENSES WHERE EXTRACT(YEAR FROM DOC_DATE) < EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = TRUE
GROUP BY PROJ_ID ) AS CASH_EPY
ON P.PROJ_ID= CASH_EPY.PROJ_ID
-- CASH DEDUCTIONS FROM PAST MONTHS IN CUREENT YEAR
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(TOTAL_VALUE, 0)) as CASH_PAST_MONTHS
FROM EXPENSES WHERE EXTRACT(MONTH FROM DOC_DATE) < EXTRACT(MONTH FROM CURRENT_DATE)
AND EXTRACT(YEAR FROM DOC_DATE) = EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = TRUE
GROUP BY PROJ_ID ) AS CASH_EF
ON P.PROJ_ID= CASH_EF.PROJ_ID
-- CASH DEDUCTIONS FROM CURRENT MONTH AND YEAR
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(TOTAL_VALUE, 0)) as CASH_CURRENT_MONTH
FROM EXPENSES WHERE EXTRACT(MONTH FROM DOC_DATE) = EXTRACT(MONTH FROM CURRENT_DATE) AND EXTRACT(YEAR FROM DOC_DATE) = EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = TRUE
GROUP BY PROJ_ID ) AS CASH_ECM
ON P.PROJ_ID= CASH_ECM.PROJ_ID
-- SUM OF CASH DEDUCTIONS IN CURRENT YEAR
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(TOTAL_VALUE, 0)) as CASH_CURRENT_YEAR
FROM EXPENSES WHERE EXTRACT(YEAR FROM DOC_DATE) = EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = TRUE
GROUP BY PROJ_ID ) AS CASH_ECY
ON P.PROJ_ID= CASH_ECY.PROJ_ID
-- TOTAL CASH DEDUCTIONS FROM ALL TIME
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(TOTAL_VALUE, 0)) as CASH_TOTAL_EXPENSES
FROM EXPENSES WHERE CASH_DEDUCTIONS = TRUE
GROUP BY PROJ_ID ) AS CASH_E
ON P.PROJ_ID= CASH_E.PROJ_ID
-- TOTAL EXPENSES AND CASH DEDUCTIONS FROM ALL TIME
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(TOTAL_VALUE, 0)) as TOTAL_EXPENSES_CASH
FROM EXPENSES
GROUP BY PROJ_ID ) AS TOTAL_E
ON P.PROJ_ID= TOTAL_E.PROJ_ID
-- ADDED DURATIONS
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(ADDED_VALUE, 0) - COALESCE(REMOVED_VALUE, 0)) as ADDED_DURATIONS
FROM DURATIONS
GROUP BY PROJ_ID ) AS DU
ON P.PROJ_ID= DU.PROJ_ID
ORDER BY P.PROJ_YEAR, P.TYPE_ID, P.PROJ_NO
我认为最好从费用 table 的一个子查询开始。看起来您在子查询中的合并只是在 1 列上用 0 替换空值 - 您可以 运行 一个更新来解决这个问题，但如果没有，我已经包含了一种只执行一次的方法下面的例子。
你有（例如）：
-- TOTAL CASH DEDUCTIONS FROM ALL TIME
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(TOTAL_VALUE, 0)) as CASH_TOTAL_EXPENSES
FROM EXPENSES WHERE CASH_DEDUCTIONS = TRUE
GROUP BY PROJ_ID ) AS CASH_E
ON P.PROJ_ID= CASH_E.PROJ_ID
-- TOTAL EXPENSES AND CASH DEDUCTIONS FROM ALL TIME
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(TOTAL_VALUE, 0)) as TOTAL_EXPENSES_CASH
FROM EXPENSES
GROUP BY PROJ_ID ) AS TOTAL_E
ON P.PROJ_ID= TOTAL_E.PROJ_ID
您可以改为这样做：
with MY_EXPENSES AS
(
select COALESCE(TOTAL_VALUE, 0) as MY_TOTAL_VALUE, exp.*
from EXPENSES),
EXPENSES_SUMMARY AS
(
SELECT PROJ_ID,
sum(case when CASH_DEDUCTIONS = TRUE
then MY_TOTAL_VALUE else 0
end) as CASH_TOTAL_EXPENSES,
sum(MY_TOTAL_VALUE) as TOTAL_EXPENSES_CASH
FROM MY_EXPENSES
GROUP BY PROJ_ID )
<Big Query>
LEFT OUTER JOIN EXPENSES_SUMMARY es P.PROJ_ID= TOTAL_E.PROJ_ID
基本上从子查询中的 where 子句中取出条件，并将它们放在总和内的 case 语句中 - 然后您可以拥有全部 15 个或无论多少个项目来自该 EXPENSES table在子查询项中。只需要合并 TOTAL_VALUE 一次而不是在每个子查询中。
您还可以创建一个视图来处理汇总数据。
EXPENSES、DURATION 或 COSTS 中是否存在根本不存在的 proj_id？如果不是，那么一旦您进行了上述更改，您就不必在主查询中执行任何 COALESCE。如果是这样，那么您可能仍然需要用 0 替换一些空值 - 如果您只想从查询中获取合并，可以在客户端执行此操作。
总的来说，我发现 'with . . . select' 对于复杂的查询更具可读性，但这可能只是一种偏好。
，这是最后一个更快更清晰的代码
WITH
EXPENSES_SUMS
AS
(
SELECT
PROJ_ID
, SUM(CASE
WHEN EXTRACT(YEAR FROM DOC_DATE) < EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = FALSE
THEN TOTAL_VALUE
END) AS PAST_YEARS
, SUM(CASE
WHEN EXTRACT(MONTH FROM DOC_DATE) < EXTRACT(MONTH FROM CURRENT_DATE) AND EXTRACT(YEAR FROM DOC_DATE) = EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = FALSE
THEN TOTAL_VALUE
END) AS PAST_MONTHS
, SUM(CASE
WHEN EXTRACT(MONTH FROM DOC_DATE) = EXTRACT(MONTH FROM CURRENT_DATE) AND EXTRACT(YEAR FROM DOC_DATE) = EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = FALSE
THEN TOTAL_VALUE
END) AS CURRENT_MONTH
, SUM(CASE
WHEN EXTRACT(YEAR FROM DOC_DATE) = EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = FALSE
THEN TOTAL_VALUE
END) AS CURRENT_YEAR
, SUM(CASE
WHEN CASH_DEDUCTIONS = FALSE
THEN TOTAL_VALUE
END) AS TOTAL_EXPENSES
, SUM(CASE
WHEN EXTRACT(YEAR FROM DOC_DATE) < EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = TRUE
THEN TOTAL_VALUE
END) AS CASH_PAST_YEARS
, SUM(CASE
WHEN EXTRACT(MONTH FROM DOC_DATE) < EXTRACT(MONTH FROM CURRENT_DATE) AND EXTRACT(YEAR FROM DOC_DATE) = EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = TRUE
THEN TOTAL_VALUE
END) AS CASH_PAST_MONTHS
, SUM(CASE
WHEN EXTRACT(MONTH FROM DOC_DATE) = EXTRACT(MONTH FROM CURRENT_DATE) AND EXTRACT(YEAR FROM DOC_DATE) = EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = TRUE
THEN TOTAL_VALUE
END) AS CASH_CURRENT_MONTH
, SUM(CASE
WHEN EXTRACT(YEAR FROM DOC_DATE) = EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = TRUE
THEN TOTAL_VALUE
END) AS CASH_CURRENT_YEAR
, SUM(CASE
WHEN CASH_DEDUCTIONS = TRUE
THEN TOTAL_VALUE
END) AS CASH_TOTAL_EXPENSES
, SUM(TOTAL_VALUE) AS TOTAL_EXPENSES_CASH
--you can add more columns with your conditions here in case expressions
FROM
EXPENSES
GROUP BY
PROJ_ID
)
,
COSTS_SUMS
AS
(
SELECT
PROJ_ID
, SUM(COALESCE(ADDED_VALUE, 0) - COALESCE(REMOVED_VALUE, 0)) AS ADDED_COSTS
--you can add more columns with your conditions here in case expressions
FROM
COSTS
GROUP BY
PROJ_ID
)
,
DURATIONS_SUMS
AS
(
SELECT
PROJ_ID
, SUM(COALESCE(ADDED_VALUE, 0) - COALESCE(REMOVED_VALUE, 0)) AS ADDED_DURATIONS
--you can add more columns with your conditions here in case expressions
FROM
DURATIONS
GROUP BY
PROJ_ID
)
SELECT
P.PROJ_ID
, P.PROJ_STATUS
, P.TYPE_ID
, PT.TYPE_NAME
, P.CLASS_ID
, CLA.CLASS_NAME
, P.PROJ_NO
, P.PROJ_YEAR
, P.PROJ_NAME
, P.OLD_PROJ_NAME
, P.AGENCY_ID
, A.AGENCY_NAME
, P.CONTRACT_NO
, P.CONTRACT_DATE
, P.MINISTRY_ID
, M.MINISTRY_NAME
, P.DIRECTORATE_ID
, DIR.DIRECTORATE_NAME
, P.COST
, P.ESTIMATED_COST
, COALESCE(CO.ADDED_COSTS, 0) AS ADDED_COSTS
, (COALESCE(P.COST, 0) + COALESCE(CO.ADDED_COSTS, 0)) AS TOTAL_COST
, P.ALLOCATION
, COALESCE(ED.PAST_YEARS, 0) AS PAST_YEARS
, COALESCE(ED.PAST_MONTHS, 0) AS PAST_MONTHS
, COALESCE(ED.CURRENT_MONTH, 0) AS CURRENT_MONTH
, COALESCE(ED.CURRENT_YEAR, 0) AS CURRENT_YEAR
, COALESCE(ED.TOTAL_EXPENSES, 0) AS TOTAL_EXPENSES
, COALESCE(ED.CASH_PAST_YEARS, 0) AS CASH_PAST_YEARS
, COALESCE(ED.CASH_PAST_MONTHS, 0) AS CASH_PAST_MONTHS
, COALESCE(ED.CASH_CURRENT_MONTH, 0) AS CASH_CURRENT_MONTH
, COALESCE(ED.CASH_CURRENT_YEAR, 0) AS CASH_CURRENT_YEAR
, COALESCE(ED.CASH_TOTAL_EXPENSES, 0) AS CASH_TOTAL_EXPENSES
, COALESCE(ED.TOTAL_EXPENSES_CASH, 0) AS TOTAL_EXPENSES_CASH
, ((COALESCE(P.COST, 0) + COALESCE(CO.ADDED_COSTS, 0)) - COALESCE(ED.TOTAL_EXPENSES, 0)) AS REMAINING
, P.DURATION
, COALESCE(DU.ADDED_DURATIONS, 0) AS ADDED_DURATIONS
, (COALESCE(P.DURATION, 0) + COALESCE(DU.ADDED_DURATIONS, 0)) AS TOTAL_DURATION
, P.START_DATE
, P.FINISH_DATE
, P.GOVERNORATE_ID
, G.GOVERNORATE_NAME
, P.PROVINCE_ID
, PR.PROVINCE_NAME
, P.DISTRICT_ID
, D.DISTRICT_NAME
, P.TOWN_ID
, T.TOWN_NAME
, COALESCE( (ED.TOTAL_EXPENSES / (COALESCE(P.COST, 0) + COALESCE(CO.ADDED_COSTS, 0)))/100, 0) AS FINANCIAL_ACHIEVEMENT
, P.MATERIAL_ACHIEVEMENT
, P.NOTES
FROM
PROJECTS P
INNER JOIN PROJECTS_TYPES PT ON P.TYPE_ID = PT.TYPE_ID
INNER JOIN CLASSES CLA ON P.CLASS_ID = CLA.CLASS_ID
INNER JOIN AGENCIES A ON P.AGENCY_ID = A.AGENCY_ID
LEFT JOIN MINISTRIES M ON P.MINISTRY_ID = M.MINISTRY_ID
LEFT JOIN DIRECTORATES DIR ON P.DIRECTORATE_ID = DIR.DIRECTORATE_ID
INNER JOIN GOVERNORATES G ON P.GOVERNORATE_ID = G.GOVERNORATE_ID
LEFT JOIN PROVINCES PR ON P.PROVINCE_ID = PR.PROVINCE_ID
LEFT JOIN DISTRICTS D ON P.DISTRICT_ID = D.DISTRICT_ID
LEFT JOIN TOWNS T ON P.TOWN_ID = T.TOWN_ID
LEFT JOIN EXPENSES_SUMS ED ON P.PROJ_ID = ED.PROJ_ID
LEFT JOIN COSTS_SUMS CO ON P.PROJ_ID = CO.PROJ_ID
LEFT JOIN DURATIONS_SUMS DU ON P.PROJ_ID = CO.PROJ_ID
ORDER BY
P.PROJ_YEAR
, P.TYPE_ID
, P.PROJ_NO
我使用下面的代码从其他表中计算出所需的信息。我使用联接来显示名称而不是 ID，并从其他表中获取所需的总和。我使用 COALESCE 将 null 转换为零。
如果我需要对已经合并的值求和，我不得不再次使用它，上面的代码很难理解，而且越来越难，因为我需要添加更多信息，这只是主要项目的一小部分所以使用它真的很难，而且会有很多错误和错误。
有必要这么复杂吗？还是我做错了？如果它必须像这样复杂，是否有任何替代方法可以用更简单的方法和代码获得相同的结果？另一个 RDBMS 还是其他？
SELECT P.PROJ_ID, P.PROJ_STATUS, P.TYPE_ID, PT.TYPE_NAME, P.CLASS_ID, CLA.CLASS_NAME, P.PROJ_NO, P.PROJ_YEAR, P.PROJ_NAME, P.OLD_PROJ_NAME,
P.AGENCY_ID, A.AGENCY_NAME, P.CONTRACT_NO, P.CONTRACT_DATE, P.MINISTRY_ID, M.MINISTRY_NAME,
P.DIRECTORATE_ID, DIR.DIRECTORATE_NAME,
P.COST, P.ESTIMATED_COST, COALESCE(CO.ADDED_COSTS, 0) AS ADDED_COSTS, (COALESCE(P.COST, 0) + COALESCE(CO.ADDED_COSTS, 0)) AS TOTAL_COST,
P.ALLOCATION,
COALESCE(EPY.PAST_YEARS, 0) AS PAST_YEARS,
COALESCE(EF.PAST_MONTHS, 0) AS PAST_MONTHS,
COALESCE(ECM.CURRENT_MONTH, 0) AS CURRENT_MONTH,
COALESCE(ECY.CURRENT_YEAR, 0) AS CURRENT_YEAR,
COALESCE(E.TOTAL_EXPENSES, 0) AS TOTAL_EXPENSES,
COALESCE(CASH_EPY.CASH_PAST_YEARS, 0) AS CASH_PAST_YEARS,
COALESCE(CASH_EF.CASH_PAST_MONTHS, 0) AS CASH_PAST_MONTHS,
COALESCE(CASH_ECM.CASH_CURRENT_MONTH, 0) AS CASH_CURRENT_MONTH,
COALESCE(CASH_ECY.CASH_CURRENT_YEAR, 0) AS CASH_CURRENT_YEAR,
COALESCE(CASH_E.CASH_TOTAL_EXPENSES, 0) AS CASH_TOTAL_EXPENSES,
COALESCE(TOTAL_E.TOTAL_EXPENSES_CASH, 0) AS TOTAL_EXPENSES_CASH,
((COALESCE(P.COST, 0) + COALESCE(CO.ADDED_COSTS, 0)) - COALESCE(E.TOTAL_EXPENSES, 0)) AS REMAINING,
P.DURATION, COALESCE(DU.ADDED_DURATIONS, 0) AS ADDED_DURATIONS,
(COALESCE(P.DURATION, 0) + COALESCE(DU.ADDED_DURATIONS, 0)) AS TOTAL_DURATION, P.START_DATE, P.FINISH_DATE,
P.GOVERNORATE_ID, G.GOVERNORATE_NAME, P.PROVINCE_ID, PR.PROVINCE_NAME, P.DISTRICT_ID, D.DISTRICT_NAME,
P.TOWN_ID, T.TOWN_NAME,
COALESCE( (E.TOTAL_EXPENSES / (COALESCE(P.COST, 0) + COALESCE(CO.ADDED_COSTS, 0)))/100, 0) AS FINANCIAL_ACHIEVEMENT,
P.MATERIAL_ACHIEVEMENT, P.NOTES
FROM PROJECTS P
INNER JOIN PROJECTS_TYPES PT
ON P.TYPE_ID = PT.TYPE_ID
INNER JOIN CLASSES CLA
ON P.CLASS_ID = CLA.CLASS_ID
INNER JOIN AGENCIES A
ON P.AGENCY_ID = A.AGENCY_ID
LEFT JOIN MINISTRIES M
ON P.MINISTRY_ID = M.MINISTRY_ID
LEFT JOIN DIRECTORATES DIR
ON P.DIRECTORATE_ID = DIR.DIRECTORATE_ID
INNER JOIN GOVERNORATES G
ON P.GOVERNORATE_ID = G.GOVERNORATE_ID
LEFT JOIN PROVINCES PR
ON P.PROVINCE_ID = PR.PROVINCE_ID
LEFT JOIN DISTRICTS D
ON P.DISTRICT_ID = D.DISTRICT_ID
LEFT JOIN TOWNS T
ON P.TOWN_ID = T.TOWN_ID
-- ADDED COSTS
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(ADDED_VALUE, 0) - COALESCE(REMOVED_VALUE, 0)) as ADDED_COSTS
FROM COSTS
GROUP BY PROJ_ID ) AS CO
ON P.PROJ_ID = CO.PROJ_ID
-- EXPENSES FROM PAST YEARS
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(TOTAL_VALUE, 0)) as PAST_YEARS
FROM EXPENSES WHERE EXTRACT(YEAR FROM DOC_DATE) < EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = FALSE
GROUP BY PROJ_ID ) AS EPY
ON P.PROJ_ID= EPY.PROJ_ID
-- EXPENSES FROM PAST MONTHS IN CUREENT YEAR
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(TOTAL_VALUE, 0)) as PAST_MONTHS
FROM EXPENSES WHERE EXTRACT(MONTH FROM DOC_DATE) < EXTRACT(MONTH FROM CURRENT_DATE)
AND EXTRACT(YEAR FROM DOC_DATE) = EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = FALSE
GROUP BY PROJ_ID ) AS EF
ON P.PROJ_ID= EF.PROJ_ID
-- EXPENSES FROM CURRENT MONTH AND YEAR
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(TOTAL_VALUE, 0)) as CURRENT_MONTH
FROM EXPENSES WHERE EXTRACT(MONTH FROM DOC_DATE) = EXTRACT(MONTH FROM CURRENT_DATE) AND EXTRACT(YEAR FROM DOC_DATE) = EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = FALSE
GROUP BY PROJ_ID ) AS ECM
ON P.PROJ_ID= ECM.PROJ_ID
-- SUM OF EXPENSES IN CURRENT YEAR
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(TOTAL_VALUE, 0)) as CURRENT_YEAR
FROM EXPENSES WHERE EXTRACT(YEAR FROM DOC_DATE) = EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = FALSE
GROUP BY PROJ_ID ) AS ECY
ON P.PROJ_ID= ECY.PROJ_ID
-- TOTAL EXPENSES FROM ALL TIME
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(TOTAL_VALUE, 0)) as TOTAL_EXPENSES
FROM EXPENSES WHERE CASH_DEDUCTIONS = FALSE
GROUP BY PROJ_ID ) AS E
ON P.PROJ_ID= E.PROJ_ID
-- CASH DEDUCTIONS SUMS
-- CASH DEDUCTIONS FROM PAST YEARS
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(TOTAL_VALUE, 0)) as CASH_PAST_YEARS
FROM EXPENSES WHERE EXTRACT(YEAR FROM DOC_DATE) < EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = TRUE
GROUP BY PROJ_ID ) AS CASH_EPY
ON P.PROJ_ID= CASH_EPY.PROJ_ID
-- CASH DEDUCTIONS FROM PAST MONTHS IN CUREENT YEAR
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(TOTAL_VALUE, 0)) as CASH_PAST_MONTHS
FROM EXPENSES WHERE EXTRACT(MONTH FROM DOC_DATE) < EXTRACT(MONTH FROM CURRENT_DATE)
AND EXTRACT(YEAR FROM DOC_DATE) = EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = TRUE
GROUP BY PROJ_ID ) AS CASH_EF
ON P.PROJ_ID= CASH_EF.PROJ_ID
-- CASH DEDUCTIONS FROM CURRENT MONTH AND YEAR
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(TOTAL_VALUE, 0)) as CASH_CURRENT_MONTH
FROM EXPENSES WHERE EXTRACT(MONTH FROM DOC_DATE) = EXTRACT(MONTH FROM CURRENT_DATE) AND EXTRACT(YEAR FROM DOC_DATE) = EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = TRUE
GROUP BY PROJ_ID ) AS CASH_ECM
ON P.PROJ_ID= CASH_ECM.PROJ_ID
-- SUM OF CASH DEDUCTIONS IN CURRENT YEAR
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(TOTAL_VALUE, 0)) as CASH_CURRENT_YEAR
FROM EXPENSES WHERE EXTRACT(YEAR FROM DOC_DATE) = EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = TRUE
GROUP BY PROJ_ID ) AS CASH_ECY
ON P.PROJ_ID= CASH_ECY.PROJ_ID
-- TOTAL CASH DEDUCTIONS FROM ALL TIME
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(TOTAL_VALUE, 0)) as CASH_TOTAL_EXPENSES
FROM EXPENSES WHERE CASH_DEDUCTIONS = TRUE
GROUP BY PROJ_ID ) AS CASH_E
ON P.PROJ_ID= CASH_E.PROJ_ID
-- TOTAL EXPENSES AND CASH DEDUCTIONS FROM ALL TIME
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(TOTAL_VALUE, 0)) as TOTAL_EXPENSES_CASH
FROM EXPENSES
GROUP BY PROJ_ID ) AS TOTAL_E
ON P.PROJ_ID= TOTAL_E.PROJ_ID
-- ADDED DURATIONS
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(ADDED_VALUE, 0) - COALESCE(REMOVED_VALUE, 0)) as ADDED_DURATIONS
FROM DURATIONS
GROUP BY PROJ_ID ) AS DU
ON P.PROJ_ID= DU.PROJ_ID
ORDER BY P.PROJ_YEAR, P.TYPE_ID, P.PROJ_NO
我认为最好从费用 table 的一个子查询开始。看起来您在子查询中的合并只是在 1 列上用 0 替换空值 - 您可以 运行 一个更新来解决这个问题，但如果没有，我已经包含了一种只执行一次的方法下面的例子。
你有（例如）：
-- TOTAL CASH DEDUCTIONS FROM ALL TIME
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(TOTAL_VALUE, 0)) as CASH_TOTAL_EXPENSES
FROM EXPENSES WHERE CASH_DEDUCTIONS = TRUE
GROUP BY PROJ_ID ) AS CASH_E
ON P.PROJ_ID= CASH_E.PROJ_ID
-- TOTAL EXPENSES AND CASH DEDUCTIONS FROM ALL TIME
LEFT JOIN (SELECT PROJ_ID, SUM(COALESCE(TOTAL_VALUE, 0)) as TOTAL_EXPENSES_CASH
FROM EXPENSES
GROUP BY PROJ_ID ) AS TOTAL_E
ON P.PROJ_ID= TOTAL_E.PROJ_ID
您可以改为这样做：
with MY_EXPENSES AS
(
select COALESCE(TOTAL_VALUE, 0) as MY_TOTAL_VALUE, exp.*
from EXPENSES),
EXPENSES_SUMMARY AS
(
SELECT PROJ_ID,
sum(case when CASH_DEDUCTIONS = TRUE
then MY_TOTAL_VALUE else 0
end) as CASH_TOTAL_EXPENSES,
sum(MY_TOTAL_VALUE) as TOTAL_EXPENSES_CASH
FROM MY_EXPENSES
GROUP BY PROJ_ID )
<Big Query>
LEFT OUTER JOIN EXPENSES_SUMMARY es P.PROJ_ID= TOTAL_E.PROJ_ID
基本上从子查询中的 where 子句中取出条件，并将它们放在总和内的 case 语句中 - 然后您可以拥有全部 15 个或无论多少个项目来自该 EXPENSES table在子查询项中。只需要合并 TOTAL_VALUE 一次而不是在每个子查询中。
您还可以创建一个视图来处理汇总数据。
EXPENSES、DURATION 或 COSTS 中是否存在根本不存在的 proj_id？如果不是，那么一旦您进行了上述更改，您就不必在主查询中执行任何 COALESCE。如果是这样，那么您可能仍然需要用 0 替换一些空值 - 如果您只想从查询中获取合并，可以在客户端执行此操作。
总的来说，我发现 'with . . . select' 对于复杂的查询更具可读性，但这可能只是一种偏好。
WITH
EXPENSES_SUMS
AS
(
SELECT
PROJ_ID
, SUM(CASE
WHEN EXTRACT(YEAR FROM DOC_DATE) < EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = FALSE
THEN TOTAL_VALUE
END) AS PAST_YEARS
, SUM(CASE
WHEN EXTRACT(MONTH FROM DOC_DATE) < EXTRACT(MONTH FROM CURRENT_DATE) AND EXTRACT(YEAR FROM DOC_DATE) = EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = FALSE
THEN TOTAL_VALUE
END) AS PAST_MONTHS
, SUM(CASE
WHEN EXTRACT(MONTH FROM DOC_DATE) = EXTRACT(MONTH FROM CURRENT_DATE) AND EXTRACT(YEAR FROM DOC_DATE) = EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = FALSE
THEN TOTAL_VALUE
END) AS CURRENT_MONTH
, SUM(CASE
WHEN EXTRACT(YEAR FROM DOC_DATE) = EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = FALSE
THEN TOTAL_VALUE
END) AS CURRENT_YEAR
, SUM(CASE
WHEN CASH_DEDUCTIONS = FALSE
THEN TOTAL_VALUE
END) AS TOTAL_EXPENSES
, SUM(CASE
WHEN EXTRACT(YEAR FROM DOC_DATE) < EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = TRUE
THEN TOTAL_VALUE
END) AS CASH_PAST_YEARS
, SUM(CASE
WHEN EXTRACT(MONTH FROM DOC_DATE) < EXTRACT(MONTH FROM CURRENT_DATE) AND EXTRACT(YEAR FROM DOC_DATE) = EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = TRUE
THEN TOTAL_VALUE
END) AS CASH_PAST_MONTHS
, SUM(CASE
WHEN EXTRACT(MONTH FROM DOC_DATE) = EXTRACT(MONTH FROM CURRENT_DATE) AND EXTRACT(YEAR FROM DOC_DATE) = EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = TRUE
THEN TOTAL_VALUE
END) AS CASH_CURRENT_MONTH
, SUM(CASE
WHEN EXTRACT(YEAR FROM DOC_DATE) = EXTRACT(YEAR FROM CURRENT_DATE) AND CASH_DEDUCTIONS = TRUE
THEN TOTAL_VALUE
END) AS CASH_CURRENT_YEAR
, SUM(CASE
WHEN CASH_DEDUCTIONS = TRUE
THEN TOTAL_VALUE
END) AS CASH_TOTAL_EXPENSES
, SUM(TOTAL_VALUE) AS TOTAL_EXPENSES_CASH
--you can add more columns with your conditions here in case expressions
FROM
EXPENSES
GROUP BY
PROJ_ID
)
,
COSTS_SUMS
AS
(
SELECT
PROJ_ID
, SUM(COALESCE(ADDED_VALUE, 0) - COALESCE(REMOVED_VALUE, 0)) AS ADDED_COSTS
--you can add more columns with your conditions here in case expressions
FROM
COSTS
GROUP BY
PROJ_ID
)
,
DURATIONS_SUMS
AS
(
SELECT
PROJ_ID
, SUM(COALESCE(ADDED_VALUE, 0) - COALESCE(REMOVED_VALUE, 0)) AS ADDED_DURATIONS
--you can add more columns with your conditions here in case expressions
FROM
DURATIONS
GROUP BY
PROJ_ID
)
SELECT
P.PROJ_ID
, P.PROJ_STATUS
, P.TYPE_ID
, PT.TYPE_NAME
, P.CLASS_ID
, CLA.CLASS_NAME
, P.PROJ_NO
, P.PROJ_YEAR
, P.PROJ_NAME
, P.OLD_PROJ_NAME
, P.AGENCY_ID
, A.AGENCY_NAME
, P.CONTRACT_NO
, P.CONTRACT_DATE
, P.MINISTRY_ID
, M.MINISTRY_NAME
, P.DIRECTORATE_ID
, DIR.DIRECTORATE_NAME
, P.COST
, P.ESTIMATED_COST
, COALESCE(CO.ADDED_COSTS, 0) AS ADDED_COSTS
, (COALESCE(P.COST, 0) + COALESCE(CO.ADDED_COSTS, 0)) AS TOTAL_COST
, P.ALLOCATION
, COALESCE(ED.PAST_YEARS, 0) AS PAST_YEARS
, COALESCE(ED.PAST_MONTHS, 0) AS PAST_MONTHS
, COALESCE(ED.CURRENT_MONTH, 0) AS CURRENT_MONTH
, COALESCE(ED.CURRENT_YEAR, 0) AS CURRENT_YEAR
, COALESCE(ED.TOTAL_EXPENSES, 0) AS TOTAL_EXPENSES
, COALESCE(ED.CASH_PAST_YEARS, 0) AS CASH_PAST_YEARS
, COALESCE(ED.CASH_PAST_MONTHS, 0) AS CASH_PAST_MONTHS
, COALESCE(ED.CASH_CURRENT_MONTH, 0) AS CASH_CURRENT_MONTH
, COALESCE(ED.CASH_CURRENT_YEAR, 0) AS CASH_CURRENT_YEAR
, COALESCE(ED.CASH_TOTAL_EXPENSES, 0) AS CASH_TOTAL_EXPENSES
, COALESCE(ED.TOTAL_EXPENSES_CASH, 0) AS TOTAL_EXPENSES_CASH
, ((COALESCE(P.COST, 0) + COALESCE(CO.ADDED_COSTS, 0)) - COALESCE(ED.TOTAL_EXPENSES, 0)) AS REMAINING
, P.DURATION
, COALESCE(DU.ADDED_DURATIONS, 0) AS ADDED_DURATIONS
, (COALESCE(P.DURATION, 0) + COALESCE(DU.ADDED_DURATIONS, 0)) AS TOTAL_DURATION
, P.START_DATE
, P.FINISH_DATE
, P.GOVERNORATE_ID
, G.GOVERNORATE_NAME
, P.PROVINCE_ID
, PR.PROVINCE_NAME
, P.DISTRICT_ID
, D.DISTRICT_NAME
, P.TOWN_ID
, T.TOWN_NAME
, COALESCE( (ED.TOTAL_EXPENSES / (COALESCE(P.COST, 0) + COALESCE(CO.ADDED_COSTS, 0)))/100, 0) AS FINANCIAL_ACHIEVEMENT
, P.MATERIAL_ACHIEVEMENT
, P.NOTES
FROM
PROJECTS P
INNER JOIN PROJECTS_TYPES PT ON P.TYPE_ID = PT.TYPE_ID
INNER JOIN CLASSES CLA ON P.CLASS_ID = CLA.CLASS_ID
INNER JOIN AGENCIES A ON P.AGENCY_ID = A.AGENCY_ID
LEFT JOIN MINISTRIES M ON P.MINISTRY_ID = M.MINISTRY_ID
LEFT JOIN DIRECTORATES DIR ON P.DIRECTORATE_ID = DIR.DIRECTORATE_ID
INNER JOIN GOVERNORATES G ON P.GOVERNORATE_ID = G.GOVERNORATE_ID
LEFT JOIN PROVINCES PR ON P.PROVINCE_ID = PR.PROVINCE_ID
LEFT JOIN DISTRICTS D ON P.DISTRICT_ID = D.DISTRICT_ID
LEFT JOIN TOWNS T ON P.TOWN_ID = T.TOWN_ID
LEFT JOIN EXPENSES_SUMS ED ON P.PROJ_ID = ED.PROJ_ID
LEFT JOIN COSTS_SUMS CO ON P.PROJ_ID = CO.PROJ_ID
LEFT JOIN DURATIONS_SUMS DU ON P.PROJ_ID = CO.PROJ_ID
ORDER BY
P.PROJ_YEAR
, P.TYPE_ID
, P.PROJ_NO