在java8 JDK包含许多聚合操作（如平均值，总和，最小，***，和计数），返回一个计算流stream的聚合结果。这些聚合操作被称为聚合操作。 JDK除返回……

  随着现代社会越来越依赖大数据来分析获取信息，及时精准的请求和存储也是极为重要的。Redis是一套开源实现的内存数据库，特别之处，在于Redis做了大量的优化……

文档解释 ORA-41689: invalid collection specification in the rule condition Cause: An attempt was made to insert a rule condition with invalid collec……

文档解释 ORA-22615: attribute is not a collection Cause: collection routine is invoked upon a non-collection attribute Action: Make sure attribute i……

文档解释 ORA-41707: unsupported construct with collection events: “string” Cause: An attempt was made to define a collection rule condition with uns……

文档解释 ORA-54560: query element cannot be a collection or multitype geometry Cause: A query element was a collection geometry or a multitype geome……

文档解释 ORA-22316: input type is not a collection type Cause: The user is trying to obtain information for collection types on a non-named collecti……

文档解释 ORA-22619: all collection elements have already been accessed Cause: Accessing a collection element after all the collection elements are a……

文档解释 ORA-22166: collection is empty Cause: Given collection is empty. Action: Test if collection is empty prior to invoking this function. 香港……

文档解释 ORA-22612: TDS does not describe a collection TDS Cause: collection construct/access routines are being on an image but the TDS does not de……