java - JOOQ - nested query -

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i'm trying write query jooq

select region.*,         (select count(*)         city          city.region_id = region.id) num region;

i tried few things, no success. far got nothing more than

dsl.select().from(tables.region).fetch();

how can add num column result? appreciated.

your query this:

// how can select region.* dsl.select(region.fields())  // how can add more fields select clause    .select(  // nested selects select() (from dsl)         select(count())        .from(city)        .where(city.region_id.eq(region.id))  // how convert org.jooq.select field        .asfield("num")    )    .from(region)    .fetch();

the above implementation assuming static imports:

import static org.jooq.impl.dsl.*; import static path.to.generated.tables.*;

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