wikidata-to-surrealdb/Useful queries.md

# filter.surql examples
## Delete entity and related claims, if entity doesn't have the claim, number of episodes property (P1113)
```
let $del = select claims, id from Entity
where claims.claims[where id = Property:1113].value.Thing == [];

let $entity = return (select id from $del).id;
let $claims = return (select claims from $del).claims;

delete $claims;
delete $entity;
```

# Select for media
```
SELECT
*,
# number of episodes
(claims.claims[WHERE id = Property:1113].value.ClaimValueData.Quantity.amount)[0] AS episodes,
# part of the series
(claims.claims[WHERE id = Property:179].value.Thing)[0] AS parent,
# has part(s)
claims.claims[WHERE id = Property:527].value.Thing AS children
FROM Entity;
```

## Get number of episodes
```
let $number_of_episodes = (select claims.claims[where id = Property:1113][0].value.ClaimValueData.Quantity.amount as number_of_episodes from Entity where label = "Black Clover, season 1")[0].number_of_episodes;

return $number_of_episodes;

update Entity SET number_of_episodes=$number_of_episodes where label = "Black Clover, season 1";
```

## Get Parts
```
let $parts = (select claims.claims[where id = Property:527].value.Thing as parts from Entity where label = "Black Clover")[0].parts;

return $parts;
```