計算フィールド使用時に「invalid input syntax for type date」エラーが発生する場合、空の文字列をNULLに置き換えることで解決できます。
これは、データベースの制限事項が原因となって発生するエラーです。データベースによっては、空白の値 (空の文字列) を日付としてキャストできない場合があります。DATE() 関数を使用する場合や、文字列フィールドを日付データ型に変換する場合に、このエラーが発生する可能性があります。
IF [date field]="" THEN NULL ELSE [date field]) END
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