如何存储 select 语句的结果并能够在另一个 select 语句中再次使用它 PL\SQL Oracle

Posted 2023-03-27

【中文标题】如何存储 select 语句的结果并能够在另一个 select 语句中再次使用它 PL\\SQL Oracle

【英文标题】：How to store the results of a select statement and be able to use it again in another select statement PL\SQL Oracle如何存储 select 语句的结果并能够在另一个 select 语句中再次使用它 PL\SQL Oracle

【发布时间】：2014-08-22 09:46:24

【问题描述】：

我正在尝试存储 select 语句的结果（可能在临时内存中？），然后调用保存的结果并能够在其他选择中再次使用它，因此它不必一次又一次地执行，这将增加执行时间。我在想也许使用过程或游标会是解决方案，但我知道足够的 SQL 能够使用它，任何帮助都会有所帮助！

这是我要存储的选择语句：

select "PO Number2", "Total"

from (select distinct "PO Number2", sum("Amount") as "Total"

      from (select distinct account as Account,
                            company as Company,
                            year_period_key as "Year Period Key",
                            voucher_no as "Voucher No",
                            voucher_type as "Vou Type",
                            voucher_date as "GRN/Invoice Date",
                            reference_number as "PO Number2",
                            code_c as "Project ID",
                            ifsapp.PURCHASE_ORDER_API.Get_Vendor_No(reference_number) as "Supplier ID",
                            ifsapp.SUPPLIER_INFO_API.Get_Name(ifsapp.PURCHASE_ORDER_API.Get_Vendor_No(reference_number)) as "Supplier Name",
                            sum(quantity) as "Quantity",
                            sum(amount) as "Amount",
                            sum(debet_amount) as "Debit Amount",
                            sum(credit_amount) as "Credit Amount"

              from ifsapp.GEN_LED_VOUCHER_ROW_UNION_QRY

             where account = '222010'
               and Voucher_Type = '0'

             group by voucher_type,
                      account,
                      year_period_key,
                      voucher_date,
                      reference_number,
                      code_c,
                      company,
                      voucher_no,
                      party_type_id

            union all

            select distinct account as Account,
                            company as Company,
                            year_period_key as "Year Period Key",
                            voucher_no as "Voucher No",
                            voucher_type as "Vou Type",
                            voucher_date as "GRN/Invoice Date",
                            ifsapp.MAN_SUPP_INVOICE_API.Get_Purchase_Order_Ref_Number(company,
                                                                                      party_type_id,
                                                                                      'Supplier',
                                                                                      reference_number) as "PO Number2",
                            code_c as "Project ID",
                            ifsapp.PURCHASE_ORDER_API.Get_Vendor_No(ifsapp.MAN_SUPP_INVOICE_API.Get_Purchase_Order_Ref_Number(company,
                                                                                                                              party_type_id,
                                                                                                                              'Supplier',
                                                                                                                              reference_number)) as "Supplier ID",
                            ifsapp.SUPPLIER_INFO_API.Get_Name(ifsapp.PURCHASE_ORDER_API.Get_Vendor_No(ifsapp.MAN_SUPP_INVOICE_API.Get_Purchase_Order_Ref_Number(company,
                                                                                                                                                                party_type_id,
                                                                                                                                                                'Supplier',
                                                                                                                                                                reference_number))) as "Supplier Name",
                            sum(quantity) as "Quantity",
                            sum(amount) as "Amount",
                            sum(debet_amount) as "Debit Amount",
                            sum(credit_amount) as "Credit Amount"

              from ifsapp.GEN_LED_VOUCHER_ROW_UNION_QRY

             where account = '222010'
               and Voucher_Type = 'J'
             group by voucher_type,
                      account,
                      year_period_key,
                      voucher_date,
                      reference_number,
                      code_c,
                      company,
                      voucher_no,
                      party_type_id)

     where "Year Period Key" <= '&YearPeriodKey'
     group by "PO Number2")

where "Total" = 0

提前致谢！ :)

【问题讨论】：

查看物化视图

使用提示/*+ RESULT_CACHE */

请注意：结果缓存仅适用于 Oracle 企业版

我建议你看看确定性函数

@tbone - ...或全局临时表...

【参考方案1】：

Oracle 拥有自己的优化器，可帮助您避免多次执行相同的查询。如果查询完全相同，它将结果存储在服务器内存（有限）上。因此，如果您在一分钟内执行此查询 5 次，它不会消耗很多资源。提前，你应该看看物化视图是否不能解决你的问题。

【参考方案2】：

您是要“存储”结果并在单个会话中重复使用，还是要存储结果以供其他会话重复使用。要物化查询数据，使其对其他会话可见，并一直保持到调用刷新（手动或调度）时，那么您实际上是在查看物化视图。如果这只是为了单个会话/作业的目的，并且避免重复重新查询数据，请记住，使用 ref-cursors 你只能前进。您可以将数据写入 PLSQL 表（数组/集合），但如果数据集很大，请注意内存。对于较大的数据集，最好的选择可能是临时表。