Support update table1, table2, ... query support. Closes #192

site/docs/examples/update/0010-single-row.js

@@ -5,6 +5,4 @@ export const singleRow = `const result = await db
     last_name: 'Aniston'
   })
   .where('id', '=', '1')
-  .executeTakeFirst()
-
-console.log(result.numUpdatedRows)`
+  .executeTakeFirst()`

site/docs/examples/update/0020-complex-values.js

@@ -6,6 +6,4 @@ export const complexValues = `const result = await db
     last_name: 'updated',
   }))
   .where('id', '=', '1')
-  .executeTakeFirst()
-
-console.log(result.numUpdatedRows)`
+  .executeTakeFirst()`

site/docs/examples/update/0030-my-sql-joins.js

@@ -0,0 +1,7 @@
+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()`

site/docs/examples/update/0030-my-sql-joins.mdx

@@ -0,0 +1,40 @@
+---
+title: 'MySQL joins'
+---
+
+# MySQL joins
+
+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.
+
+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.
+
+import {
+  Playground,
+  exampleSetup,
+} from '../../../src/components/Playground'
+
+import {
+  mySqlJoins
+} from './0030-my-sql-joins'
+
+<div style={{ marginBottom: '1em' }}>
+  <Playground code={mySqlJoins} setupCode={exampleSetup} />
+</div>
+
+:::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!
+
+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)
+:::

src/operation-node/update-query-node.ts

@@ -12,6 +12,7 @@ import { ExplainNode } from './explain-node.js'
 import { LimitNode } from './limit-node.js'
 import { TopNode } from './top-node.js'
 import { OutputNode } from './output-node.js'
+import { ListNode } from './list-node.js'
 
 export type UpdateValuesNode = ValueListNode | PrimitiveValueListNode
 
@@ -38,10 +39,15 @@ export const UpdateQueryNode = freeze({
     return node.kind === 'UpdateQueryNode'
   },
 
-  create(table: OperationNode, withNode?: WithNode): UpdateQueryNode {
+  create(
+    tables: ReadonlyArray<OperationNode>,
+    withNode?: WithNode,
+  ): UpdateQueryNode {
     return freeze({
       kind: 'UpdateQueryNode',
-      table,
+      // For backwards compatibility, use the raw table node when there's only one table
+      // and don't rename the property to something like `tables`.
+      table: tables.length === 1 ? tables[0] : ListNode.create(tables),
       ...(withNode && { with: withNode }),
     })
   },

src/parser/select-parser.ts

@@ -73,9 +73,10 @@ export type SelectArg<
   | ReadonlyArray<SE>
   | ((eb: ExpressionBuilder<DB, TB>) => ReadonlyArray<SE>)
 
-type FlattenSelectExpression<SE> = SE extends DynamicReferenceBuilder<infer RA>
-  ? { [R in RA]: DynamicReferenceBuilder<R> }[RA]
-  : SE
+type FlattenSelectExpression<SE> =
+  SE extends DynamicReferenceBuilder<infer RA>
+    ? { [R in RA]: DynamicReferenceBuilder<R> }[RA]
+    : SE
 
 type ExtractAliasFromSelectExpression<SE> = SE extends string
   ? ExtractAliasFromStringSelectExpression<SE>

src/parser/update-set-parser.ts

@@ -12,12 +12,19 @@ import {
   parseReferenceExpression,
   ReferenceExpression,
 } from './reference-parser.js'
+import { AnyColumn, DrainOuterGeneric } from '../util/type-utils.js'
 
-export type UpdateObject<DB, TB extends keyof DB, UT extends keyof DB = TB> = {
-  [C in UpdateKeys<DB[UT]>]?:
-    | ValueExpression<DB, TB, UpdateType<DB[UT][C]>>
-    | undefined
-}
+export type UpdateObject<
+  DB,
+  TB extends keyof DB,
+  UT extends keyof DB = TB,
+> = DrainOuterGeneric<{
+  [C in AnyColumn<DB, UT>]?: {
+    [T in UT]: C extends keyof DB[T]
+      ? ValueExpression<DB, TB, UpdateType<DB[T][C]>> | undefined
+      : never
+  }[UT]
+}>
 
 export type UpdateObjectFactory<
   DB,

src/plugin/with-schema/with-schema-transformer.ts

@@ -1,5 +1,6 @@
 import { AliasNode } from '../../operation-node/alias-node.js'
 import { IdentifierNode } from '../../operation-node/identifier-node.js'
+import { ListNode } from '../../operation-node/list-node.js'
 import { OperationNodeTransformer } from '../../operation-node/operation-node-transformer.js'
 import { OperationNode } from '../../operation-node/operation-node.js'
 import { ReferencesNode } from '../../operation-node/references-node.js'
@@ -157,14 +158,14 @@ export class WithSchemaTransformer extends OperationNodeTransformer {
     node: OperationNode,
     schemableIds: Set<string>,
   ): void {
-    const table = TableNode.is(node)
-      ? node
-      : AliasNode.is(node) && TableNode.is(node.node)
-        ? node.node
-        : null
-
-    if (table) {
-      this.#collectSchemableId(table.table, schemableIds)
+    if (TableNode.is(node)) {
+      this.#collectSchemableId(node.table, schemableIds)
+    } else if (AliasNode.is(node) && TableNode.is(node.node)) {
+      this.#collectSchemableId(node.node.table, schemableIds)
+    } else if (ListNode.is(node)) {
+      for (const table of node.items) {
+        this.#collectSchemableIdsFromTableExpr(table, schemableIds)
+      }
     }
   }
 

src/query-builder/update-query-builder.ts

@@ -521,8 +521,6 @@ export class UpdateQueryBuilder<DB, UT extends keyof DB, TB extends keyof DB, O>
    *   })
    *   .where('id', '=', '1')
    *   .executeTakeFirst()
-   *
-   * console.log(result.numUpdatedRows)
    * ```
    *
    * The generated SQL (PostgreSQL):
@@ -546,8 +544,6 @@ export class UpdateQueryBuilder<DB, UT extends keyof DB, TB extends keyof DB, O>
    *   }))
    *   .where('id', '=', '1')
    *   .executeTakeFirst()
-   *
-   * console.log(result.numUpdatedRows)
    * ```
    *
    * The generated SQL (PostgreSQL):
@@ -630,6 +626,43 @@ export class UpdateQueryBuilder<DB, UT extends keyof DB, TB extends keyof DB, O>
    * "last_name" = $3 || $4
    * where "id" = $5
    * ```
+   *
+   * <!-- siteExample("update", "MySQL joins", 30) -->
+   *
+   * 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.
+   *
+   * 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.
+   *
+   * ```ts
+   * 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()
+   * ```
+   *
+   * The generated SQL (MySQL):
+   *
+   * ```sql
+   * update
+   *   `person`,
+   *   `pet`
+   * set
+   *   `person`.`first_name` = ?,
+   *   `pet`.`name` = ?
+   * where
+   *   `person`.`id` = `pet`.`owner_id`
+   *   and `person`.`id` = ?
+   * ```
    */
   set(
     update: UpdateObjectExpression<DB, TB, UT>,

src/query-compiler/default-query-compiler.ts

@@ -798,6 +798,10 @@ export class DefaultQueryCompiler
     }
 
     if (node.joins) {
+      if (!node.from) {
+        throw new Error("Joins in an update query are only supported as a part of a PostgreSQL 'update set from join' query. If you want to create a MySQL 'update join set' query, see https://kysely.dev/docs/examples/update/my-sql-joins")
+      }
+
       this.append(' ')
       this.compileList(node.joins, ' ')
     }

src/query-creator.ts

@@ -464,39 +464,48 @@ export class QueryCreator<DB> {
    * console.log(result.numUpdatedRows)
    * ```
    */
-  updateTable<TR extends keyof DB & string>(
-    table: TR,
+  updateTable<TE extends keyof DB & string>(
+    from: TE[],
   ): UpdateQueryBuilder<
     DB,
-    ExtractTableAlias<DB, TR>,
-    ExtractTableAlias<DB, TR>,
+    ExtractTableAlias<DB, TE>,
+    ExtractTableAlias<DB, TE>,
     UpdateResult
   >
 
-  updateTable<TR extends AnyAliasedTable<DB>>(
-    table: TR,
+  updateTable<TE extends TableExpression<DB, never>>(
+    from: TE[],
   ): UpdateQueryBuilder<
-    DB & PickTableWithAlias<DB, TR>,
-    ExtractTableAlias<DB & PickTableWithAlias<DB, TR>, TR>,
-    ExtractTableAlias<DB & PickTableWithAlias<DB, TR>, TR>,
+    From<DB, TE>,
+    FromTables<DB, never, TE>,
+    FromTables<DB, never, TE>,
     UpdateResult
   >
 
-  updateTable<TR extends TableReference<DB>>(
-    table: TR,
+  updateTable<TE extends keyof DB & string>(
+    from: TE,
   ): UpdateQueryBuilder<
-    From<DB, TR>,
-    FromTables<DB, never, TR>,
-    FromTables<DB, never, TR>,
+    DB,
+    ExtractTableAlias<DB, TE>,
+    ExtractTableAlias<DB, TE>,
     UpdateResult
   >
 
-  updateTable<TR extends TableReference<DB>>(table: TR): any {
+  updateTable<TE extends AnyAliasedTable<DB>>(
+    from: TE,
+  ): UpdateQueryBuilder<
+    DB & PickTableWithAlias<DB, TE>,
+    ExtractTableAlias<DB & PickTableWithAlias<DB, TE>, TE>,
+    ExtractTableAlias<DB & PickTableWithAlias<DB, TE>, TE>,
+    UpdateResult
+  >
+
+  updateTable(tables: TableExpressionOrList<any, any>): any {
     return new UpdateQueryBuilder({
       queryId: createQueryId(),
       executor: this.#props.executor,
       queryNode: UpdateQueryNode.create(
-        parseTableExpression(table),
+        parseTableExpressionOrList(tables),
         this.#props.withNode,
       ),
     })