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LDC-Q2001 — The query reads a relation the snapshot does not have

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# LDC-Q2001 — The query reads a relation the snapshot does not have

## What it means

Every source in a query names a relation — the table of rows to read, such
as rules, nodes, or labels. The snapshot carries a fixed set of relations,
and the engine checks each name against that set before reading anything.
An unknown name stops the query, and the message lists the relations that
do exist, so a typo is easy to spot.

Pick the intended relation from the listed names. When the data really
lives elsewhere, point the source at the right package instead of renaming
the relation.

## Example

```lawql
from r in nosuchrelation select r
```

## Fix

```lawql
from r in rules select r
```

## Engine message

The engine reports this in its own wording:

```text
LDC-Q2001: unknown relation 'nosuchrelation'. Hint: available: anchors, edges, fields, imports, interpretations, labels, links, literals, nodes, norms, positions, rules, variables, windows
```

## Related

- [Questions to the engine](/constructs/queries/) — the relations a snapshot carries.