NB-076
27 lines
1.1 KiB
Markdown
27 lines
1.1 KiB
Markdown
# 33-mix-1N-diffkeybreak — 1:N Matching with Different-Key Break
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## 电信业务场景
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线路+类型混合切替。先做线路↔通话类型的关联，再检测通话类型的变化。用于不同通话类型(语音/SMS/数据)的计费切换。
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## Purpose
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Demonstrates 1:N matching pattern where the key break detection uses a different key field than the match key, showing master-to-detail transitions.
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## Test Coverage
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1. **1:N matching** — One master (M0001) matched to three details
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2. **Different-key break** — Key break is triggered by master ID change (M0001 -> M0002 -> M0003 -> M0004)
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3. **Unmatched master ID** — Detail with M9999 has no matching master
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4. **Summary per break** — Count and total per master ID group
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5. **Final break** — Last group summary at end of file
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## Data
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- 4 master records (M0001 through M0004) with names, types, amounts
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- 10 detail records with master ID references
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## Key Techniques
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- In-memory master table loaded at startup
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- Key break on master ID field (different from detail transaction ID)
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- Accumulator per break group
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- Grand total across all groups
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- Unmatched ID detection and reporting
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