Xiao Zhou, Xiao Wu, Xiao Deng and Xiao Wang's occupations are: dancers, nurses, teachers and costume designers  I also know that Xiao Zhou's salary is higher than nurses, and Xiao Zheng's salary is lower than Xiao Wu's, dancers
The salary is lower than that of a costume designer, and the costume designer is either Xiao Zheng or Xiao Wang
All the four people's occupations cannot be determined.