# 08-keybreak-aggregate — Key Break Aggregate

## 电信业务场景

套餐统计。按套餐代码进行key切聚合，计算各套餐的合同数、最大/最小金额、总量等统计信息。

Demonstrates key break processing with four statistical aggregates:

- **COUNT**: Number of records in each key group
- **MIN**: Minimum VALUE in each group
- **MAX**: Maximum VALUE in each group
- **TOTAL**: Sum of VALUE in each group

Same control-break logic as 07-keybreak-summary, extended with
min/max tracking using IF comparisons.

## Files

| File | Purpose |
|------|---------|
| `main-08-keybreak-aggregate.cbl` | COBOL program (fixed format) |
| `data-gen.sh` | Generate sorted test data |
| `run.sh` | Compile, run, verify output |

## Input Record

| Field | Type | Length |
|-------|------|--------|
| KEY | PIC X | 10 |
| VALUE | PIC 9 | 10 |

## Output Record

| Field | Type |
|-------|------|
| KEY | PIC X(10) |
| COUNT | PIC Z(5)9 |
| MIN | PIC Z(9)9 |
| MAX | PIC Z(9)9 |
| TOTAL | PIC Z(9)9 |