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What is SQL-Injection?

June 18, 2015 2:07 PM / 3 Comments on What is SQL-Injection?

Warning: Toxic SQL

Warning: Toxic SQL!

I wasn’t especially surprised to read not long ago that Russian hackers had succeeded in stealing an estimated 1.2 billion login/password credentials for online websites. It seems to have become accepted that internet security is hopelessly more porous than originally envisioned, and that more large-scale breaches involving well known companies exist than are publicized. What piqued my curiosity, however, was a press report that the chief technique used for this record-shattering theft was SQL Injection: a technique which I had supposed to be long ago defeated.     Continue…

More About PIVOT Queries

January 11, 2015 11:19 AM / 2 Comments on More About PIVOT Queries

complex pivot query with both multiple aggregates and multiple pivots

complex pivot query with both multiple aggregate functions and multiple pivot columns

An earlier post introduced the PIVOT feature in Oracle’s 11g2 SQL, and described the motivation for pivoting. This one explores a few more complex ways to use pivot queries. We’ll look at:

         • Multiple Pivot Columns
         • Multiple Aggregate Functions

within the same SQL statement and we’ll see a few errors which commonly arise when building more complex pivot queries like these. Finally, we’ll consider: why would one have a need to UNPIVOT?     Continue…