回答編集履歴
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修正したSQL
test
CHANGED
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削除対象ではないチケットの添付ファイルと比較して、その中に重複している物理ファイルがないかどうかを調べないといけないですね。前回作成したのは、削除対象のチケットの中だけで重複しているかという処理になってしまっていたので、修正してみました。
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===> 修正したSQLです（MySQL）。
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```SQL
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SELECT
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db_redmine.issues.id AS チケットID
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, db_redmine.attachments.disk_filename AS 物理ファイル名
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, db_redmine.attachments.id AS 添付ファイルID
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FROM
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db_redmine.issues
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INNER JOIN db_redmine.issue_statuses
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ON db_redmine.issue_statuses.id = db_redmine.issues.status_id
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LEFT JOIN db_redmine.attachments
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ON db_redmine.issues.id = db_redmine.attachments.container_id
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LEFT OUTER JOIN (
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SELECT
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db_redmine.issues.id
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, db_redmine.attachments.disk_filename
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FROM
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db_redmine.issues
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INNER JOIN db_redmine.issue_statuses
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ON db_redmine.issue_statuses.id = db_redmine.issues.status_id
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LEFT JOIN db_redmine.attachments
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ON db_redmine.issues.id = db_redmine.attachments.container_id
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WHERE
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db_redmine.issue_statuses.is_closed = 0
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AND db_redmine.issues.project_id = 3
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UNION
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SELECT
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db_redmine.issues.id
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, db_redmine.attachments.disk_filename
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FROM
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db_redmine.issues
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INNER JOIN db_redmine.issue_statuses
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ON db_redmine.issue_statuses.id = db_redmine.issues.status_id
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LEFT JOIN db_redmine.attachments
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ON db_redmine.issues.id = db_redmine.attachments.container_id
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WHERE
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db_redmine.issue_statuses.is_closed = 1
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AND db_redmine.issues.project_id = 3
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AND db_redmine.issues.closed_on >= (Now() - INTERVAL 6 MONTH)
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) Query1
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ON db_redmine.attachments.disk_filename = Query1.disk_filename
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WHERE
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db_redmine.attachments.disk_filename IS NOT NULL
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AND Query1.disk_filename IS NULL
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AND db_redmine.issue_statuses.is_closed = 1
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AND db_redmine.issues.project_id = 3
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AND db_redmine.issues.closed_on < (Now() - INTERVAL 6 MONTH)
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ORDER BY
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db_redmine.issues.id
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, db_redmine.attachments.disk_filename
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```
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