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example of scope and order of variable and set operator #2280

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example of scope and order of variable and set operator #2280

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15 changes: 15 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 @@ -48,3 +48,18 @@ nebula> $var = GO FROM "player100" OVER follow YIELD dst(edge) AS id; \
| "Spurs" | "Manu Ginobili" |
+-----------+-----------------+
```

## Set operations and scope of user-defined variables

When assigning variables within a compound statement involving set operations, it is important to enclose the scope of the variable assignment in parentheses. In the example below, the source of the `$var` assignment is the results of the output of two `INTERSECT` statements.

```ngql
$var = ( \
GO FROM "player100" OVER follow \
YIELD dst(edge) AS id \
INTERSECT \
GO FROM "player100" OVER follow \
YIELD dst(edge) AS id \
); \
GO FROM $var.id OVER follow YIELD follow.degree AS degree
```