12 lines
336 B
MySQL
12 lines
336 B
MySQL
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WITH indexed_attachments AS (
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SELECT
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attachment_id,
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ROW_NUMBER() OVER (PARTITION BY post_id ORDER BY attachment_id) AS index
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FROM
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attachments
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)
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UPDATE attachments
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SET attachment_idx = indexed_attachments.index
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FROM indexed_attachments
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WHERE attachments.attachment_id = indexed_attachments.attachment_id;
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