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export const mySqlJoins = `const result = await db | ||
.updateTable(['person', 'pet']) | ||
.set('person.first_name', 'Updated person') | ||
.set('pet.name', 'Updated doggo') | ||
.whereRef('person.id', '=', 'pet.owner_id') | ||
.where('person.id', '=', '1') | ||
.executeTakeFirst()` |
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--- | ||
title: 'MySQL joins' | ||
--- | ||
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# MySQL joins | ||
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MySQL allows you to join tables directly to the "main" table and update | ||
rows of all joined tables. This is possible by passing all tables to the | ||
`updateTable` method as a list and adding the `ON` conditions as `WHERE` | ||
statements. You can then use the `set(column, value)` variant to update | ||
columns using table qualified names. | ||
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The `UpdateQueryBuilder` also has `innerJoin` etc. join methods, but those | ||
can only be used as part of a PostgreSQL `update set from join` query. | ||
Due to type complexity issues, we unfortunately can't make the same | ||
methods work in both cases. | ||
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import { | ||
Playground, | ||
exampleSetup, | ||
} from '../../../src/components/Playground' | ||
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import { | ||
mySqlJoins | ||
} from './0030-my-sql-joins' | ||
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<div style={{ marginBottom: '1em' }}> | ||
<Playground code={mySqlJoins} setupCode={exampleSetup} /> | ||
</div> | ||
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:::info[More examples] | ||
The API documentation is packed with examples. The API docs are hosted [here](https://kysely-org.github.io/kysely-apidoc/), | ||
but you can access the same documentation by hovering over functions/methods/classes in your IDE. The examples are always | ||
just one hover away! | ||
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||
For example, check out these sections: | ||
- [set method](https://kysely-org.github.io/kysely-apidoc/classes/UpdateQueryBuilder.html#set) | ||
- [returning method](https://kysely-org.github.io/kysely-apidoc/classes/UpdateQueryBuilder.html#returning) | ||
- [updateTable method](https://kysely-org.github.io/kysely-apidoc/classes/Kysely.html#updateTable) | ||
::: |
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