1.Unpivot列转行
源表：

SELECT YEAR,
       period,
       entity_code,
       entity_desc,
       dept_code,
       dept_desc,
       supplier_code,
       supplier_desc,
       business_type,
       account,
       VALUE
  FROM stg_ts_advance_pay unpivot(VALUE FOR account IN(advance_cny AS
                                                       '预付款申请金额(人民币)',
                                                       contract_amount_cny AS
                                                       '预付款采购合同额(人民币)',
                                                       contract_amount_cny AS
                                                       '合同额(人民币)',
                                                       contract_amount_usd AS
                                                       '合同额(美元)'))

结果展示：（数据敏感，所以隐掉公司/部门/供应商等字段数据）
新产生的列名：Account/Value

2.Pivot行转列
注意事项：Pivot使用过程中需要包含聚合函数，不然会抛Ora-56902错误。

业务类型Business_Type包含两种值：自营出口、代理出口

SELECT *
  FROM (SELECT batch_code,
               YEAR,
               period,
               business_type,
               advance_cny
          FROM stg_ts_advance_pay) pivot(SUM(advance_cny) advance_cny FOR business_type IN('自营出口' AS
                                                                                           self_export,
                                                                                           '代理出口' AS
                                                                                           agency_export));