SQL 连接两个语句

Question

我还没有发现这么大的 SQL 连接问题，这就是问题所在：我有两个 SQL 语句，一个将资金投入到不同的组中，另一个获得在这些组中花费的资金，如何我会将它们连接在一起，以便一起显示“预算”和“费用”吗？ 几乎没有部门，资金类别，预算和部门，资金类别，费用表，我想要一个部门，资金类别，预算，费用表。

SELECT st.name as "Department", sft.longname as "Funding Category", sum(sf.amount) as "Budget" 
FROM 
money_type as st, 
money_funding_type as sft, 
money_funding as sf 
WHERE 
st.ID = sf.type_ID AND 
sft.ID = sf.funding_ID 
GROUP BY 
sf.type_id, sf.funding_id 

SELECT st.name as "Department", sft.longname as "Funding Category", sum(si.amount) as "Expenses" 
FROM 
money_type as st, 
money_funding_type as sft, 
money_invoice as si 
WHERE 
st.ID = si.type_ID AND 
sft.ID = si.funding_ID 
GROUP BY 
si.type_id, si.funding_id

Answer 1

怎么样

SELECT  st.name as "Department", 
        COALESCE(sft.longname,sfti.longname) as "Funding Category", 
        sum(sf.amount) as "Budget",
        sum(si.amount) as "Expenses" 
FROM    money_type as st LEFT JOIN

        money_funding as sf  ON st.ID = sf.type_ID LEFT JOIN
        money_funding_type as sft ON sft.ID = sf.funding_ID LEFT JOIN

        money_invoice as si ON st.ID = si.type_ID LEFT JOIN
        money_funding_type as sfti  ON sfti.ID = si.funding_ID
GROUP BY    st.name, 
            COALESCE(sft.longname,sfti.longname)

Answer 2

您可以尝试以下方法。第一个查询“AllTypes”是获取可用数据的不同 ID/类型，而不是笛卡尔。从中，简单连接到类型和资金类型以获取描述。

然后，另外两个选择简化了他们自己的 money_funding / money_invoice 元素，只获取他们的“id”字段和金额总和，因此对于每个预算和费用，每种类型/资金都有 1 条记录。然后将它们左连接到“AllTypes”，如果它们有相应的值，则获取结果，否则为 0。

连接之间的额外换行符仅供阅读

SELECT
      st.name as "Department", 
      sft.longname as "Funding Category", 
      coalesce( Budgets.Budget, 0 ) as Budget,
      coalesce( Expenses.Expense, 0 ) as Expense,
      coalesce( Budgets.Budget, 0 ) - coalesce( Expenses.Expense, 0 ) as AmtRemain
   from 
      ( select distinct
              type_id,
              funding_id
           from
              money_funding
        union
        SELECT distinct
              type_id,
              funding_id
           from
              money_invoice  ) AllTypes

         JOIN money_type as st
            ON AllTypes.type_id = st.id

         JOIN money_funding_type as sft
            ON AllTypes.funding_id = sft.id

         LEFT JOIN ( SELECT 
                           sf.type_id,
                           sf.funding_id,
                           sum(sf.amount) as "Budget" 
                        FROM 
                           money_funding as sf 
                        GROUP BY 
                           sf.type_id, 
                           sf.funding_id ) Budgets
            ON AllTypes.type_id = Budgets.Type_id
            AND AllTypes.funding_id = Budgets.Funding_ID

         LEFT JOIN ( SELECT 
                           si.type_id, 
                           si.funding_id,
                           sum(si.amount) as "Expense" 
                        FROM 
                           money_invoice as si 
                        GROUP BY 
                           si.type_id, 
                           si.funding_id ) Expenses
            ON AllTypes.type_id = Expenses.Type_id
            AND AllTypes.funding_id = Expenses.Funding_ID

“AllTypes”查询，您可能需要删除第二个“DISTINCT”子句，因为第一个子句可能适用于整个“AllTypes”查询并且可能会给您一个错误。

Answer 3

使用 FULL OUTER JOIN 同时加入 Invoice 和 Funding，然后按 moneytype、funding 和 invoice 分组。