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Update ttl-options.md #2173

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Sep 28, 2022
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Update ttl-options.md #2173

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4 changes: 4 additions & 0 deletions docs-2.0/3.ngql-guide/8.clauses-and-options/ttl-options.md
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Expand Up @@ -49,6 +49,10 @@ nGQL 支持的 TTL 选项如下。
|`ttl_col`|指定要设置存活时间的属性。属性的数据类型必须是`int`或者`timestamp`。|
|`ttl_duration`|指定时间戳差值，单位：秒。时间戳差值必须为 64 位非负整数。属性值和时间戳差值之和如果小于当前时间戳，属性就会过期。如果`ttl_duration`为`0`，属性永不过期。|

!!! Note

当给值为`NULL`的属性设置 TTL 时，TTL 功能不会生效。

## 使用 TTL 选项

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