NB-076
50 lines
2.0 KiB
Markdown
50 lines
2.0 KiB
Markdown
# 18-matching-MN-to-M: M:N Matching with M Output Records
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## 电信业务场景
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合同↔套餐M:N→M条。多个合同关联多个套餐的组合匹配，输出按合同件数(M件)的匹配结果。
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## Description
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M:N matching where both sides can have duplicate keys. The output contains
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one record per master record that has at least one matching detail record
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with the same key. This tests the ability to handle M:N relationships
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and produce one output per matched master.
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The algorithm skips master groups with no matching detail key, and skips
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detail key groups that have no corresponding master key.
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## Record Layout
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Standard record (45 bytes, copybook STD-REC.cpy):
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| Field | Type | Length | Description |
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|------------|-------------------|--------|--------------------|
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| STD-KEY | PIC X | 10 | Record key |
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| STD-DATA-1 | PIC X | 20 | Text data |
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| STD-DATA-2 | PIC 9 | 10 | Numeric data |
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| STD-DATA-3 | PIC S9(7)V99 COMP-3| 5 | Packed decimal |
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## Files
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| File | Purpose |
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|---------------------------------|--------------------------------------|
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| main-18-matching-MN-to-M.cbl | Main COBOL program (fixed format) |
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| data-gen.sh | Generate test data for all files |
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| run.sh | Compile, run, verify |
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| README.md | This file |
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## Data Design
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- master.dat: 5 records -- KEY00001 (2), KEY00002 (2), KEY00003 (1)
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- detail.dat: 4 records -- KEY00001 (2), KEY00003 (2)
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- Matching keys: KEY00001, KEY00003
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- Unmatched: KEY00002 (master only)
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- Output: 3 records = 135 bytes
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## Expected Behavior
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- KEY00001 group (2 master records): matches detail KEY00001 -> output 2 records
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- KEY00002 group (2 master records): no matching detail -> output 0 records
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- KEY00003 group (1 master record): matches detail KEY00003 -> output 1 record
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- Total: 3 output records
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