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+# MARS-835: Required External Tables for Smart Column Mapping
+
+## Overview
+This document lists all external tables required for MARS-835 data exports using DATA_EXPORTER v2.4.0 with Smart Column Mapping feature.
+
+**Purpose**: Smart Column Mapping ensures CSV files are generated with columns in the EXACT order expected by external tables, preventing NULL values due to Oracle's positional CSV mapping.
+
+---
+
+## Required External Tables
+
+### Group 1: DATA Bucket (CSV Format) - **CRITICAL**
+
+#### 1. ODS.CSDB_DEBT_DATA_ODS
+- **Source Table**: OU_CSDB.LEGACY_DEBT
+- **Format**: CSV
+- **Bucket**: DATA (mrds_data_dev/ODS/CSDB/CSDB_DEBT/)
+- **Key Column Mapping**: A_ETL_LOAD_SET_FK → A_WORKFLOW_HISTORY_KEY (position 2 recommended)
+- **Critical**: Must use Smart Column Mapping to avoid NULL values in A_WORKFLOW_HISTORY_KEY
+
+#### 2. ODS.CSDB_DEBT_DAILY_DATA_ODS
+- **Source Table**: OU_CSDB.LEGACY_DEBT_DAILY
+- **Format**: CSV
+- **Bucket**: DATA (mrds_data_dev/ODS/CSDB/CSDB_DEBT_DAILY/)
+- **Key Column Mapping**: A_ETL_LOAD_SET_FK → A_WORKFLOW_HISTORY_KEY (position 2 recommended)
+- **Critical**: Must use Smart Column Mapping to avoid NULL values in A_WORKFLOW_HISTORY_KEY
+
+---
+
+### Group 2: ARCHIVE Bucket (Parquet Format) - **RECOMMENDED**
+
+#### 3. ODS.CSDB_DEBT_ARCHIVE
+- **Source Table**: OU_CSDB.LEGACY_DEBT
+- **Format**: Parquet with Hive partitioning
+- **Bucket**: ARCHIVE (mrds_hist_dev/ARCHIVE/CSDB/CSDB_DEBT/)
+- **Key Column Mapping**: A_ETL_LOAD_SET_FK → A_WORKFLOW_HISTORY_KEY
+- **Note**: Parquet uses schema-based mapping (column order less critical but Smart Column Mapping ensures consistency)
+
+#### 4. ODS.CSDB_DEBT_DAILY_ARCHIVE
+- **Source Table**: OU_CSDB.LEGACY_DEBT_DAILY
+- **Format**: Parquet with Hive partitioning
+- **Bucket**: ARCHIVE (mrds_hist_dev/ARCHIVE/CSDB/CSDB_DEBT_DAILY/)
+- **Key Column Mapping**: A_ETL_LOAD_SET_FK → A_WORKFLOW_HISTORY_KEY
+
+#### 5. ODS.CSDB_INSTR_RAT_FULL_ARCHIVE
+- **Source Table**: OU_CSDB.LEGACY_INSTR_RAT_FULL
+- **Format**: Parquet with Hive partitioning
+- **Bucket**: ARCHIVE (mrds_hist_dev/ARCHIVE/CSDB/CSDB_INSTR_RAT_FULL/)
+- **Key Column Mapping**: A_ETL_LOAD_SET_FK → A_WORKFLOW_HISTORY_KEY
+
+#### 6. ODS.CSDB_INSTR_DESC_FULL_ARCHIVE
+- **Source Table**: OU_CSDB.LEGACY_INSTR_DESC_FULL
+- **Format**: Parquet with Hive partitioning
+- **Bucket**: ARCHIVE (mrds_hist_dev/ARCHIVE/CSDB/CSDB_INSTR_DESC_FULL/)
+- **Key Column Mapping**: A_ETL_LOAD_SET_FK → A_WORKFLOW_HISTORY_KEY
+
+#### 7. ODS.CSDB_ISSUER_RAT_FULL_ARCHIVE
+- **Source Table**: OU_CSDB.LEGACY_ISSUER_RAT_FULL
+- **Format**: Parquet with Hive partitioning
+- **Bucket**: ARCHIVE (mrds_hist_dev/ARCHIVE/CSDB/CSDB_ISSUER_RAT_FULL/)
+- **Key Column Mapping**: A_ETL_LOAD_SET_FK → A_WORKFLOW_HISTORY_KEY
+
+#### 8. ODS.CSDB_ISSUER_DESC_FULL_ARCHIVE
+- **Source Table**: OU_CSDB.LEGACY_ISSUER_DESC_FULL
+- **Format**: Parquet with Hive partitioning
+- **Bucket**: ARCHIVE (mrds_hist_dev/ARCHIVE/CSDB/CSDB_ISSUER_DESC_FULL/)
+- **Key Column Mapping**: A_ETL_LOAD_SET_FK → A_WORKFLOW_HISTORY_KEY
+
+---
+
+## External Table Column Order Requirements
+
+### **CRITICAL for CSV Tables** (DATA bucket):
+
+All CSV external tables MUST have **A_WORKFLOW_HISTORY_KEY at position 2**:
+
+```
+Position 1: A_KEY (NUMBER)
+Position 2: A_WORKFLOW_HISTORY_KEY (NUMBER)  ← MUST BE HERE!
+Position 3+: Other columns in any order
+```
+
+**Reason**: Oracle External Tables with CSV format use **positional mapping** (ignore header row). If source table has A_ETL_LOAD_SET_FK at position 72, but CSV puts it at position 72 while external table expects A_WORKFLOW_HISTORY_KEY at position 2, the external table will try to read position 2 (which might be a DATE column) as NUMBER → conversion fails → NULL value.
+
+**Solution**: Smart Column Mapping (v2.4.0) generates CSV columns in EXTERNAL TABLE order, ensuring position 2 has the correct NUMBER value.
+
+### **OPTIONAL for Parquet Tables** (ARCHIVE bucket):
+
+Parquet format uses **schema-based mapping** (column names). Column order doesn't matter, but Smart Column Mapping provides consistency.
+
+---
+
+## Creation Script Example
+
+### CSV External Table (CRITICAL - Correct Column Order)
+
+```sql
+-- Example: ODS.CSDB_DEBT_DATA_ODS
+-- IMPORTANT: A_WORKFLOW_HISTORY_KEY must be at position 2!
+
+BEGIN
+    ODS.FILE_MANAGER_ODS.CREATE_EXTERNAL_TABLE(
+        pTableName => 'CSDB_DEBT_DATA_ODS',
+        pTemplateTableName => 'CT_ET_TEMPLATES.CSDB_DEBT_TEMPLATE',
+        pPrefix => 'ODS/CSDB/CSDB_DEBT',
+        pBucketUri => CT_MRDS.ENV_MANAGER.gvDataBucketUri,
+        pFormat => 'CSV'  -- Uses positional mapping!
+    );
+END;
+/
+
+-- Verify column order (A_WORKFLOW_HISTORY_KEY should be position 2)
+SELECT column_id, column_name, data_type
+FROM all_tab_columns
+WHERE table_name = 'CSDB_DEBT_DATA_ODS'
+  AND owner = 'ODS'
+ORDER BY column_id;
+```
+
+### Parquet External Table (Optional Column Order)
+
+```sql
+-- Example: ODS.CSDB_DEBT_ARCHIVE
+-- Column order flexible (schema-based mapping)
+
+BEGIN
+    ODS.FILE_MANAGER_ODS.CREATE_EXTERNAL_TABLE(
+        pTableName => 'CSDB_DEBT_ARCHIVE',
+        pTemplateTableName => 'CT_ET_TEMPLATES.CSDB_DEBT_TEMPLATE',
+        pPrefix => 'ARCHIVE/CSDB/CSDB_DEBT',
+        pBucketUri => CT_MRDS.ENV_MANAGER.gvArchiveBucketUri,
+        pFormat => 'PARQUET'  -- Uses schema-based mapping
+    );
+END;
+/
+```
+
+---
+
+## Template Tables Required
+
+All external tables require corresponding template tables in CT_ET_TEMPLATES schema:
+
+- `CT_ET_TEMPLATES.CSDB_DEBT_TEMPLATE`
+- `CT_ET_TEMPLATES.CSDB_DEBT_DAILY_TEMPLATE`
+- `CT_ET_TEMPLATES.CSDB_INSTR_RAT_FULL_TEMPLATE`
+- `CT_ET_TEMPLATES.CSDB_INSTR_DESC_FULL_TEMPLATE`
+- `CT_ET_TEMPLATES.CSDB_ISSUER_RAT_FULL_TEMPLATE`
+- `CT_ET_TEMPLATES.CSDB_ISSUER_DESC_FULL_TEMPLATE`
+
+**Note**: Template tables must be created by ADMIN or CT_ET_TEMPLATES user (MRDS_LOADER cannot create them).
+
+---
+
+## Verification Checklist
+
+Before running MARS-835 exports:
+
+- [ ] All 8 external tables exist in ODS schema
+- [ ] CSV tables (DATA bucket) have A_WORKFLOW_HISTORY_KEY at position 2
+- [ ] Template tables exist in CT_ET_TEMPLATES schema
+- [ ] MRDS_LOADER has EXECUTE privilege on ODS.FILE_MANAGER_ODS
+- [ ] ODS schema has access to CT_MRDS.ENV_MANAGER for logging
+- [ ] DATA_EXPORTER v2.4.0 deployed with Smart Column Mapping feature
+
+---
+
+## Testing Verification
+
+After export, verify A_WORKFLOW_HISTORY_KEY is not NULL:
+
+```sql
+-- CSV tables (should be 100% populated)
+SELECT 'CSDB_DEBT_DATA_ODS' AS TABLE_NAME,
+       COUNT(*) AS TOTAL_ROWS,
+       COUNT(A_WORKFLOW_HISTORY_KEY) AS NON_NULL_COUNT,
+       ROUND(COUNT(A_WORKFLOW_HISTORY_KEY) * 100.0 / NULLIF(COUNT(*), 0), 2) AS SUCCESS_RATE_PCT
+FROM ODS.CSDB_DEBT_DATA_ODS;
+
+SELECT 'CSDB_DEBT_DAILY_DATA_ODS' AS TABLE_NAME,
+       COUNT(*) AS TOTAL_ROWS,
+       COUNT(A_WORKFLOW_HISTORY_KEY) AS NON_NULL_COUNT,
+       ROUND(COUNT(A_WORKFLOW_HISTORY_KEY) * 100.0 / NULLIF(COUNT(*), 0), 2) AS SUCCESS_RATE_PCT
+FROM ODS.CSDB_DEBT_DAILY_DATA_ODS;
+
+-- Parquet tables (should also be 100% populated)
+SELECT 'CSDB_DEBT_ARCHIVE' AS TABLE_NAME,
+       COUNT(*) AS TOTAL_ROWS,
+       COUNT(A_WORKFLOW_HISTORY_KEY) AS NON_NULL_COUNT,
+       ROUND(COUNT(A_WORKFLOW_HISTORY_KEY) * 100.0 / NULLIF(COUNT(*), 0), 2) AS SUCCESS_RATE_PCT
+FROM ODS.CSDB_DEBT_ARCHIVE;
+```
+
+**Expected Result**: SUCCESS_RATE_PCT = 100.00 for all tables
+
+---
+
+## Related Documentation
+
+- [DATA_EXPORTER v2.4.0 Smart Column Mapping Examples](../MARS-835-PREHOOK/current_version/v2.3.0/DATA_EXPORTER_v2.4.0_Smart_Column_Mapping_Examples.sql)
+- [Oracle External Tables Column Order Issue](../../confluence/additions/Oracle_External_Tables_Column_Order_Issue.md)
+- [MARS-835 README](README.md)
+
+---
+
+**Last Updated**: 2026-01-09
+**Author**: GitHub Copilot (MARS-835 Update)