In Part 1 I demonstrated how to "scrape" data from the live webpages with the votes of the Oracle Database Developer Choice Awards. Unfortunately those webpages are not ideal for scraping, so I promised a workaround. Here I do a semi-manual scraping af data by using a browser to retrieve the actual HTML, save it to a file, and then let the code parse out the data from the file.
You know about the Oracle Database Developer Choice Awards voting, right? If not, then go vote now, please, and then come back and read on :-) I want to be able to query the voting status, who is ranked what in each category and so on. But I don't want to type in votes in a table, especially not when they change all the time. Instead I'd like to query the live data in the HTML webpages. Can that be done? Yes it can...
Often, the biggest problem with regular expressions is that those who use them sometimes don’t use them correctly. A great example occurs in the Oracle Database with the REGEXP_LIKE function. For example, some developer use the following to validate whether a string is a number but it only validates whether the first character is a number.
Indexes are separate data structures that provide alternate pathways to finding data. They can and do generally speed up the processing of queries and other DML commands, like the INSERT, UPDATE, REPLACE INTO, and DELETE statements. Indexes are also called fast access paths.
Oracle is celebrating the Oracle Community by having us developers nominate and vote forOracle Database Developer Choice Awards to our fellow developers in five database development technologies:SQL, PL/SQL, ORDS, APEX, Db-DesignThe nomination period is over and it has been possible to vote since September 15th.
Have you ever wondered how to leverage substitution variables in anonymous block programs? There are several tricks that you can use beyond passing numeric and string values to local variable. The generic default appears to take a number unless you cast it as a string but that’s not really the whole story. The first two are standard examples of how to use numeric and string substitution values.
The following accept a numeric substitution value:
Using an Oracle object type’s instance in a query is a powerful capability. Unfortunately, Oracle’s SQL syntax doesn’t make it immediately obvious how to do it. Most get far enough to put it in a runtime view (a subquery in the FROM clause), but then they get errors like this: