DROP CONSTRAINT语句用于从数据库及其关联的索引中删除或删除约束。
例：
使用以下语句删除先前创建的约束及其关联的索引,
DROP CONSTRAINT ON (Kalam:president) ASSERT Kalam.Name IS UNIQUE
约束已成功删除。
验证
：schema语句用于验证是否已从模式中删除了适用的约束及其关联的索引。
输出
Neo4j删除约束
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