Last Updated: 3/10/2026

kysely

• AliasedExpression

Interface AliasedExpression

A type that holds an expression and an alias for it.

AliasedExpression can be used in places where, in addition to the value type T, you also need a name A for that value. For example anything you can pass into the select method needs to implement an AliasedExpression. A becomes the name of the selected expression in the result and T becomes its type.

Examples

import { AliasNode,  type  AliasedExpression,  type  Expression,  IdentifierNode} from  'kysely' class  SomeAliasedExpression< T, A  extends  string> implements  AliasedExpression< T, A> { #expression: Expression< T>  #alias: A  constructor(expression: Expression< T>, alias: A) { this. #expression = expression  this. #alias = alias }  get  expression(): Expression< T> { return  this. #expression }  get  alias(): A { return  this. #alias }  toOperationNode(): AliasNode { return  AliasNode. create( this. #expression. toOperationNode(),  IdentifierNode. create(this. #alias) ) }}

interface AliasedExpression<T, A extends string> {
    get alias(): A | Expression<unknown>;
    get expression(): Expression<T>;
    toOperationNode(): AliasNode;
}

Type Parameters

• T
• A extends string

Hierarchy (View Summary)

• OperationNodeSource
  • AliasedExpression
    • AliasedSelectQueryBuilder
    • AliasedRawBuilder

Implemented by

• AliasedAggregateFunctionBuilder
• AliasedExpressionWrapper
• AliasedJSONPathBuilder

Index

Accessors

alias expression

Methods

toOperationNode

Accessors

alias

• get alias(): A | Expression<unknown>

  Returns the alias.

  Returns A | Expression<unknown>

expression

• get expression(): Expression<T>

  Returns the aliased expression.

  Returns Expression<T>

Methods

toOperationNode

• toOperationNode(): AliasNode

  Creates the OperationNode that describes how to compile this expression into SQL.

  Returns AliasNode

Settings

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On This Page

ExamplesAccessors

aliasexpression

Methods

toOperationNode