跳过将数据加载到外部 table 的列

Question

这是我创建的外部table：

CREATE TABLE emp_load 
(
  "ESN_NO" VARCHAR2 (200), 
  "MAKER" VARCHAR2 (30), 
  "HANDSET" VARCHAR2 (20), 
  "MODEL_NO" VARCHAR2 (20), 
  "OMH_TTSL_FLAG" VARCHAR2 (10), 
  "OFFER" VARCHAR2 (100), 
  "STATUS" VARCHAR2 (20), 
  "STATUS_UPDATED_DATE" DATE
) ORGANIZATION EXTERNAL (
  TYPE ORACLE_LOADER DEFAULT DIRECTORY "EXT_TAB_DIR" ACCESS PARAMETERS (
    RECORDS DELIMITED BY NEWLINE skip 1
    FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"'
    missing FIELD VALUES are NULL
    ) LOCATION ('BAU.csv')
) ;

BAU.csv 文件的示例内容

ESN No          Make    Model   RI_value
A10000428A5348  Lava    C180    OFFER14
A10000428A5349  Lava    C180    OFFER14
A10000428A534A  Lava    C180    OFFER14
A10000428A534B  Lava    C180    OFFER14

它工作正常，但数据没有出现在我需要的列中；我希望 handset 列为空，但当前文件中的 model 值被加载到 handset 列中。所以我目前得到：

ESN_NO          MAKER  HANDSET  MODEL_NO  OMH_TTSL_FLAG  OFFER  STATUS  STATUS_UPDATED_DATE  
A10000428A5348  Lava   C180     OFFER14                                                      
A10000428A5349  Lava   C180     OFFER14                                                      
A10000428A534A  Lava   C180     OFFER14                                                      
A10000428A534B  Lava   C180     OFFER14

我希望跳过 handset 列并在 model_no 中插入 model；和 omh_ttsl_flag 应该被跳过，文件中的 ri_value 应该被插入到 offer 中。所以我想要结束的是：

ESN_NO          MAKER  HANDSET  MODEL_NO  OMH_TTSL_FLAG  OFFER    STATUS  STATUS_UPDATED_DATE  
A10000428A5348  Lava            C180                     OFFER14                               
A10000428A5349  Lava            C180                     OFFER14                               
A10000428A534A  Lava            C180                     OFFER14                               
A10000428A534B  Lava            C180                     OFFER14

如何在将数据加载到外部 table 时跳过这些列？

Answer 1

insert into emp_load (ESN_NO,MAKER,MODEL_NO,OFFER)
values ('A10000428A5348','Lava','Lava','OFFER14)

默认值为 null ，因此所有其他列都将收到 null

Answer 2

您可以通过将文件中的字段指定为 fields 子句的一部分，并指定未与 the column transforms clause 一起出现的字段来实现，例如：

COLUMN TRANSFORMS ("HANDSET" FROM NULL, "OMH_TTSL_FLAG" FROM NULL)

所以你的陈述变成：

CREATE TABLE emp_load 
(
  "ESN_NO" VARCHAR2 (200), 
  "MAKER" VARCHAR2 (30), 
  "HANDSET" VARCHAR2 (20), 
  "MODEL_NO" VARCHAR2 (20), 
  "OMH_TTSL_FLAG" VARCHAR2 (10), 
  "OFFER" VARCHAR2 (100), 
  "STATUS" VARCHAR2 (20), 
  "STATUS_UPDATED_DATE" DATE
)
ORGANIZATION EXTERNAL
(
  TYPE ORACLE_LOADER DEFAULT DIRECTORY "EXT_TAB_DIR" ACCESS PARAMETERS
  (
    RECORDS DELIMITED BY NEWLINE skip 1
    FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"'
    MISSING FIELD VALUES ARE NULL
    (
      "ESN_NO" CHAR (200), 
      "MAKER" CHAR (30), 
      "MODEL_NO" CHAR (20), 
      "OFFER" CHAR (100)
    )
    COLUMN TRANSFORMS
    (
      "HANDSET" FROM NULL,
      "OMH_TTSL_FLAG" FROM NULL,
      "STATUS" FROM NULL,
      "STATUS_UPDATED_DATE" FROM NULL
    )
  )
  LOCATION ('BAU.csv')
) ;

我已经包含了其他两列，这不是必需的，但有助于记录您希望看到的内容。

将您的示例数据转换为 CSV，加载为：

set sqlformat ansiconsole
column esn_no format a20
select * from emp_load;

ESN_NO          MAKER  HANDSET  MODEL_NO  OMH_TTSL_FLAG  OFFER    STATUS  STATUS_UPDATED_DATE  
A10000428A5348  Lava            C180                     OFFER14                               
A10000428A5349  Lava            C180                     OFFER14                               
A10000428A534A  Lava            C180                     OFFER14                               
A10000428A534B  Lava            C180                     OFFER14

跳过将数据加载到外部 table 的列

Skipping columns which loading data into an external table

oracle

external-tables