Using the EXISTS Function with PartiQL for DynamoDB - Amazon DynamoDB

Using the EXISTS Function with PartiQL for DynamoDB

You can use EXISTS to perform the same function as ConditionCheck does in the TransactWriteItems API. The EXISTS function can only be used in transactions.

Given a value, returns TRUE if the value is a non-empty collection. Otherwise, returns FALSE.

Note

This function can only be used in transactional operations.

Syntax

EXISTS ( statement )

Arguments

statement

(Required) The SELECT statement that the function evaluates.

Note

The SELECT statement must specify a full primary key and one other condition.

Return type

bool

Examples

EXISTS( SELECT * FROM "Music" WHERE "Artist" = 'Acme Band' AND "SongTitle" = 'PartiQL Rocks')