Hello, I am Akshay from IIT Kanpur, India.
MySql does not have the set operations-- "divide" , "intersect" and "minus" --- related queries as opposed to set operation - "union". Recently I have developed a php wrapper which could interface with MySql and implement the "divide" , "intersect" and "minus" features in the same way as "union". For example: select A,B from rel1 minus select A,B from rel2 will return the tuples(A,B) that are present in rel1 and not present in rel2. I wanted to edit the source code of Drizzle Database server so as so to incorporate these set-operations just as "union" is present. I know this set operations can be implemented using Drizzle sub-queries but most such queries are quite complex and using them by just a single command would greatly ease a lot of work. I want to take up this project under GSoC.
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