此外,还有一组名称浅显易懂的分量抽取函数,只要一个操作就能从日期、时间或时期数据中抽取一个字段。
Also, a set of component extraction functions allows one operation, with a readable name, to get one field out of a date, time, or duration. For example, compare.
基于进入系统的时间,写操作具有幂等性(不管操作多少次结果都不变的性质,比如取绝对值的函数就具有幂等性)和交换性(操作顺序不影响结果,比如加法就具有交换性)。
Write operations are idempotent and commutative, based on the time they enter the system.
IDS 现在支持一些新的内置 SQL 函数,这些函数有的执行常见的数学、类型转换和位图操作,有的操纵字符串、日期和日期时间值
IDS now supports the following new built-in SQL functions to perform common mathematical, casting, and bitmap operations, and for manipulating character string, date, and datetime values
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