- 合并操作
- 合并運(yùn)算
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union operation中文什么意思
例句與用法
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- The union operation is different from using joins that combine columns from two tables
Union運(yùn)算不同于使用聯(lián)接合并兩個(gè)表中的列的運(yùn)算。 - Specifies that all union operations are performed by merging , hashing , or concatenating union sets
指定所有union運(yùn)算由合并、哈?；虼?lián)union集執(zhí)行。 - If union is involved in the main query , only the last query involving a union operation can have the option clause
如果主查詢中涉及union ，則只有涉及union運(yùn)算符的最后一個(gè)查詢才能有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
這樣， union運(yùn)算的最終結(jié)果的數(shù)據(jù)類型將轉(zhuǎn)換為與insert操作的目標(biāo)表中的列相應(yīng)。 - The experiments also show that our union operation algorithm is superior to the algorithm that extracts the rules from context directly in time - consuming
實(shí)驗(yàn)結(jié)果同樣表明我們的并運(yùn)算算法在時(shí)間性能上要優(yōu)于直接從原形式背景中提取規(guī)則的算法。