union operation meaning in Chinese
合并操作
合并运算
Examples
- The union operation is different from using joins that combine columns from two tables
Union运算不同于使用联接合并两个表中的列的运算。 - Specifies that all union operations are performed by merging , hashing , or concatenating union sets
指定所有union运算由合并、哈希或串联union集执行。 - If union is involved in the main query , only the last query involving a union operation can have the option clause
如果主查询中涉及union ，则只有涉及union运算符的最后一个查询才能有option子句。 - Then , the data types of the final result of the union operation are cast to the corresponding columns of the table targeted by the insert operation
这样， union运算的最终结果的数据类型将转换为与insert操作的目标表中的列相应。 - The experiments also show that our union operation algorithm is superior to the algorithm that extracts the rules from context directly in time - consuming
实验结果同样表明我们的并运算算法在时间性能上要优于直接从原形式背景中提取规则的算法。