In combination with the Tetris\nsort algorithm, TempTris can be used to create intermediate query\nprocessing results that can (without external sorting), be reused to\ngenerate various sort orders. As an example of this new processing\ntechnique we propose an efficient algorithm for computing an...
英文:The database system automatically performs sorting on the query results. 中文:数据库系统会自动对查询结果进行排序。 英文:Sorting algorithms are essential in optimizing data processing. 中文:排序算法在优化数据处理方面至关重要。 英文:I spent hours manually sorting through the f...
When compiling algorithms to machine code from a high level language such as C++ (for example, the sorting function in Fig.1a), the algorithm is first compiled into assembly (Fig.1b). The assembler then converts the assembly program into executable machine code. In this work, we optimize a...
SQLXML provides faster XML serialization than ADO recordsets and allows you to easily sort your data directly in the database without requiring XSL post-processing. With SQLXML, you can do either client-side or server-side transformations, or both. Sorting data on the server allows you to ...
In the Visual Basic Editor (VBA),paste the following code and run it: VBA Sub DeleteAllCustomLists() Dim i As Integer For i = 1 To Application.CustomListCount Application.DeleteCustomList i Next i End Sub This code iterates through all custom lists and deletes them. ...
Using a sort formula implies that the formula calculations are applied to all matching items in the result set. This means that the query performance impact depends on the number of items that match the query. Long formulas with many operators require more processing time than short formulas. Us...
Sorting in database processing is frequently required through the use of Order By and Distinct clauses in SQL. Sorting is also widely known in computer science community at large. Sorting in general covers internal and external sorting. Past published work has extensively focused on external sorting...
Using a sort formula implies that the formula calculations are applied to all matching items in the result set. This means that the query performance impact depends on the number of items that match the query.Long formulas with many operators require more processing time than short formulas.Using...
in a different order. This sorting can be done on the client side, but, as I noted in the past, I prefer to return data based on how it will be used as it trims down client-side processing. I am also a firm believer that manipulating data is often handled better in the database....
Removing duplicates in DISTINCT 在这样的场景下 hashing 是更好的选择,它能有效减少排序所需的额外工作。 Hashing Aggregation 利用一个临时 (ephemeral) 的 hash table 来记录必要的信息,即检查 hash table 中是否存在已经记录过的元素并作出相应操作: