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      <title>SQL JOIN 類型｜圖解 INNER / LEFT / RIGHT / FULL</title>
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      <description>JOIN 是把兩張表依照條件合併。INNER 只保留交集，LEFT 保留左表全部，RIGHT 保留右表全部，FULL 保留所有資料。一次搞懂差異。</description>
      
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      <title>Transaction 隔離級別｜Dirty Read、Phantom Read 一次搞懂</title>
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      <pubDate>Fri, 08 May 2026 00:00:00 +0000</pubDate>
      
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      <description>四個隔離級別從寬到嚴：Read Uncommitted、Read Committed、Repeatable Read、Serializable。每升一級，能防住更多並發問題，但效能代價也更高。</description>
      
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      <title>databaseindex｜為什麼是 B&#43; Tree？</title>
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      <pubDate>Fri, 01 May 2026 00:00:00 +0000</pubDate>
      
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      <description>B+ Tree 矮胖結構減少磁碟 I/O，且葉節點鍊結適合範圍查詢，是databaseindex首選。</description>
      
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