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Tables must have the same primary key, unique index, or unique constraint.
表必须具有相同的主键、唯一索引或唯一约束。
youdao
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Can't remove unique constraint since it's the primary key of a table.
唯一约束是表的主键,因此不能移除。
youdao
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Can't remove unique constraint since it's the primary key of a table.
唯一约束是表的主键,因此不能移除。
youdao