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70 lines
1.4 KiB
Markdown
70 lines
1.4 KiB
Markdown
---
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toc_priority: 141
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---
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# deltaSum {#agg_functions-deltasum}
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计算连续行之间的差值和。如果差值为负，则忽略。
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**语法**
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``` sql
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deltaSum(value)
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```
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**参数**
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- `value` — 必须是 [整型](../../data-types/int-uint.md) 或者 [浮点型](../../data-types/float.md) 。
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**返回值**
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- `Integer` or `Float` 型的算术差值和。
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**示例**
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查询:
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``` sql
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SELECT deltaSum(arrayJoin([1, 2, 3]));
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```
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结果:
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``` text
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┌─deltaSum(arrayJoin([1, 2, 3]))─┐
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│ 2 │
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└────────────────────────────────┘
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```
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查询:
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``` sql
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SELECT deltaSum(arrayJoin([1, 2, 3, 0, 3, 4, 2, 3]));
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```
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结果:
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``` text
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┌─deltaSum(arrayJoin([1, 2, 3, 0, 3, 4, 2, 3]))─┐
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│ 7 │
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└───────────────────────────────────────────────┘
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```
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查询:
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``` sql
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SELECT deltaSum(arrayJoin([2.25, 3, 4.5]));
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```
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结果:
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``` text
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┌─deltaSum(arrayJoin([2.25, 3, 4.5]))─┐
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│ 2.25 │
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└─────────────────────────────────────┘
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```
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**参见**
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- [runningDifference](../../functions/other-functions.md#other_functions-runningdifference)
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