约束 NOT NULL约束 UNIQUE约束 PRIMARY KEY FOREIGN KEY CHECK约束 约束 约束子句用于声明约束，新行或者更新的行必须满足这些约束才能成功插入或更新。如果存在违反约束的数据行为，行为会被约束终止。 约束可以在创建表时规定（通过 CREATE TABLE 语句），或者在表创建之后规定（通过 ALTER ...

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GAUSS-04511 – GAUSS-04520 GAUSS-04511 – GAUSS-04520 GAUSS-04511: “user-defined text search parser is not yet supported.” SQLSTATE: 0A000 错误原因：特性不支持。 解决办法：不建议使用。 GAUSS-04513:...

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