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這段 SQL 查詢會列出指定資料庫中每個資料表的名稱、所屬 Schema、行數（Row Count）、總佔用空間（KB）、已使用空間（KB）以及未使用空間（KB），並依據總佔用空間進行降序排序。這對於 資料庫管理與最佳化 非常有用，能幫助 DBA 或開發人員分析表的大小、尋找可能需要清理或最佳化的表，提升資料庫效能。
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