NB-076
26 lines
984 B
Markdown
26 lines
984 B
Markdown
# 35-merge — MERGE Processing Program
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## 电信业务场景
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多源CDR合并。使用MERGE语句将来自多个BSS系统的CDR文件(2~3个)合并为一个统合CDR文件，支持OUTPUT PROCEDURE。
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## Purpose
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Demonstrates COBOL MERGE statement capabilities, covering MR-N001 through MR-N004 and MR-A001.
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## Test Coverage
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| ID | Test | Description |
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|----|------|-------------|
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| MR-N001 | 2-file MERGE | Merge two sorted files, ASCENDING KEY |
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| MR-N002 | 3-file MERGE | Merge three sorted files into one |
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| MR-N003 | Duplicate key MERGE | Files with overlapping keys |
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| MR-N004 | OUTPUT PROCEDURE | MERGE with output procedure processing |
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| MR-A001 | Unsorted input anomaly | MERGE with unsorted input (expected unpredictable results) |
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## Key Techniques
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- MERGE USING (multiple input files)
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- MERGE GIVING (direct output)
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- MERGE with OUTPUT PROCEDURE
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- RETURN statement in output procedure
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- ASCENDING KEY for merge ordering
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- Note: MERGE requires pre-sorted input files
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