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The join statements of the database can be used conveniently to perform the operation of alignment join. But sometimes the data is stored in the text files, and to compute it in Java alone we need to write a large number of loop statements. This makes the code cumbersome. Using esProc to help with programming in Java can solve the problem easily and quickly. Let’s look at how this works…

ContinueAdded by Jessica May on September 28, 2014 at 8:00am — No Comments

Program development for data process often involves cross-database relational operations. The following example will illustrate Java’s method of handling these operations. *sales* table is in *db2* database, *employee* table is in *mysql* database. The task is to join *sales* with *employee* through *sellerid* of *sales* table and *eid* of *employee* table, and filter out the data in*sales* and *employee*that…

Added by Jessica May on September 9, 2014 at 1:03am — No Comments

The computing power of SQL for mass structured data is complete, that is to say, it is impossible to find anything that SQL cannot compute. But its support layer is too low, which can lead to over-elaborate operation in practical application.…

ContinueAdded by Jessica May on July 27, 2014 at 9:30pm — No Comments

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