As newkid mentioned that underneath of SQL is relational algebra. Though, in actual SQL practice, does anyone apply relational algebra solution to data searching question then translate the solution to SQL commands?
And actually here many IT people are excellent developer/analyser, system/networking/database administers even they did not systemically learn IT/ math.
Our Chinese people over-emphasize knowledge of base theories but ignore practical skills especially real world skills.
BTW, AS400 is a platform rather than a database.
And actually here many IT people are excellent developer/analyser, system/networking/database administers even they did not systemically learn IT/ math.
Our Chinese people over-emphasize knowledge of base theories but ignore practical skills especially real world skills.
BTW, AS400 is a platform rather than a database.