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´«ÖDz¥¿Í£­Tree in SQL£¨ÒëÎÄ£©£¨3£©

This has some predictable results that we can use for building queries. The root is always of the form (left = 1, right = 2 * (SELECT COUNT(*) from TreeTable)); leaf nodes always have (left + 1 = right); the BETWEEN predicate defines the subtrees; and so on. Here are some common queries that you can ......
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