Also, column names can be inherited more easily from set operators such as UNION.
另外，可以更轻松地从集合操作符(比如union)继承列名称。
Standard Boolean operators are available, such as and, or, xor and not.
可以使用标准的布尔操作符，比如and、or、xor和not。
As such, careful operators limit its top speed to 45 kilometers per hour.
因此，谨慎的操作员会把车速控制在每小时45公里以下。
Avoid expensive operators such as NOT LIKE.
避免像NOTLIKE等耗费性能的操作。
Avoid expensive operators such as NOT LIKE.
避免像NOTLIKE等耗费性能的操作。
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