In many cases SQL is used to implement a transposition algorithm, such as static/dynamic transposition, natural/inverse transposition, single-/multi-group data transposition, transposition after data alignment/complementing and transposition with/without computed columns. There are different SQL implementations for dif...
2015-08-27 1596 0
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Not all reporting tools support inter-row calculations directly. When they don’t, you need to write scripts to implement them, which is really a big hassle, even bigger when multilayer data grouping is involved. esProc can deal with this situation thanks to its support for order-related calculations. An esProc script c...
2015-08-24 1281 0
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You can handle simple file comparisons with the console command, Java, python and perl. But all of them are not good at performing set operations and structured computations. This will result in complicated code for multi-threaded processing and cumbersome process in comparing multiple fields, big files and the files w...
2015-08-20 1533 0
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Encapsulated lots of functions for handling structured file computing, esProc can import text files with complex formats, carry out cursor-style processing with big files and simplify multithreaded parallel processing. Usually there are three modes in which esProc can be applied: a standalone mode, the execution from c...
2015-08-19 1820 0
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There are many knotty problems around report development. These include complex layout, which is difficult to build with a reporting tool alone; complex data sources requiring dynamic access and involving different types of databases or non-database data; as well as the handling of order-related computation, subsets of...
2015-08-18 1512 0
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Java can handle simple parsing of semi-structured JSON data, but has difficulty in handling the in-depth processing. esProc, which supports set operations, order-related operations and dynamic script execution, can help reduce the difficulty. A Java application will execute an esProc script in the same way as it execut...
2015-08-14 1433 0
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It is difficult to produce unusual report layouts automatically with functionalities provided by reporting tools. But if we can prepare data sources in an appropriate way, the difficulty of building such a report will be significantly reduced.
To do that, we can use esProc (its free edition is available). It not only s...
2015-08-12 1615 0
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Sometimes you need to query a big text file, instead of the database. In those cases, you need to retrieve the file in a stream style to perform the query algorithm, in which parallel processing is needed to improve the computing performance. As Java lacks the class library for doing these, you have to use hardcoding t...
2015-08-10 1175 0
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With class library for merely simple parsing jobs, Java and reporting tools have difficulty in handling in-depth processing of semi-structured JSON data. esProc can help reduce the difficulty. A reporting tool will execute an esProc script in the same way as it executes a database stored procedure, pass parameters to t...
2015-08-06 1505 0
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esProc has lots of functions for processing structured and semi-structured data, as well as supports parsing expressions dynamically and using heterogeneous data sources. A reporting tool can pass in parameters, execute an esProc script the same way as it executes a database stored procedure and gets the result set thr...
2015-08-05 2645 0
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Encapsulated lots of functions for handling structured file computing, esProc can import text files with complex formats, implement cursor-style processing with big files and simplify multithreaded parallel processing. A Java application can pass in parameters, execute an esProc script the same way as it executes a dat...
2015-08-04 2411 0
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esProc can simplify complex SQL-style queries using ordered sets, object-style access and stepwise computation. Usually there are two ways in which esProc is used: an independent one and one requiring integration with Java. Now let’s look at the first one through an example.
The sales table stores several years ...
2015-07-30 1755 0
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In addition to conventional databases, data sources of a reporting tool could also involve JSON files, MongoDB, txt files, Excel and HDFS files. Normally reporting tools can handle a single data source, but they are unable to manage various data sources requiring consolidation. Even though the data sources are of the s...
2015-06-29 1512 0
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It is difficult for SQL to handle order-related computations, for it does not support ordered sets. But as these computations are very common in real-world business, there are a lot of online discussions related to them. For example:
http://stackoverflow.com/questions/29750567/count-several-rows-as-one-if-the-next-row-...
2015-06-25 1118 0
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In real-world business, many computing tasks require transposing rows and columns dynamically. There are a lot of discussions around the operation in online IT groups and forums. Below lists some of them:
http://www.dbforums.com/showthread.php?1628876-SQL-question-how-to-move-two-column-data-to-one-column-data
https://...
2015-06-23 1326 0
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