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Update optional-match.md (#2331)
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foesa-yang authored Nov 18, 2022
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# OPTIONAL MATCH

!!! caution

目前 `OPTIONAL MATCH` 为 Beta 功能,后续可能会有一定优化调整。

`OPTIONAL MATCH`通常与`MATCH`语句一起使用,作为`MATCH`语句的可选项去匹配命中的模式,如果没有命中对应的模式,对应的列返回`NULL`

## openCypher 兼容性
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