计算机术语“projection”的中英文意思、释义、翻译及用法-计算机英汉双解词典

术语	projection
释义	projection 投影 In relational databases, an operation in relational algebra. A projection on a given relation, specifying attributes of that relation, produces a second relation containing only those attributes with all duplicates removed. 在关系数据库中,关系代数中一种操作。在给定关系上指定该关系属性的一个投影产生只包含那些属性的且重复项全已取走的第二个关系。参阅relational algebra。
随便看	programmable programmable array logic (PAL) programmable calculator (PROCAL) programmable clock programmable concentrator programmable controller (PC) programmable counter programmable data control unit programmable electronic terminal phones programmable frequency synthesizer programmable function key programmable gain programmable interval timer programmable logic array (PLA) programmable memory programmable pointofsale terminal programmable readonly memory (PROM) programmable remote display terminal programmable storage programmable terminal (PT) programmable work station program maintenance program maintenance procedures program management program management control table (PMCT)

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