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Unexpected redefined alias error #2456

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Jan 9, 2023
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Unexpected redefined alias error #2456

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Unexpected redefined alias error
abby-cyber Jan 9, 2023
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Update 2.user-defined-variables.md
abby-cyber Jan 9, 2023
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4 changes: 4 additions & 0 deletions docs-2.0/3.ngql-guide/4.variable-and-composite-queries/2.user-defined-variables.md
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Expand Up @@ -17,6 +17,10 @@ nebula> MATCH (v:player{name:"Tim Duncan"}) RETURN v;

示例中的`v`就是自定义变量。

!!! caution

在同一个 MATCH 语句的模式中，不能重复使用边变量。例如`e`不能重复被写在模式`p=(v1)-[e*2..2]->(v2)-[e*2..2]->(v3)`中。如果想表示两个相同的边，可以使用两个不同的边变量。
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## 原生 nGQL

nGQL 扩展的自定义变量可以表示为`$var_name`，`var_name`由字母、数字或下划线（_）构成，不允许使用其他字符。
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