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DynamoDBで属性が無いItemをFilterExpressionで抽出する

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`attribute_not_exists' を使い以下のように書くことができます。
この例では属性ageが設定されていないアイテムが抽出されます。

const params: QueryInput = {
  // 略
  FilterExpression: 'attribute_not_exists(age)'
};
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