relational algebra to SQL converter or vice versa -

I would like to know whether my relational algebraic statements are correct, so there is a program in which the relational algebra equivalent is produced. A SQL query?

I do not know about one, each SQL query does not have relational algebra equivalents and every RA Expression is not equal in SQL.

You want to check out, which is based on the tutorial D - is actually a relational language RA.