Demonstrate the database concepts for the following scenario: A company management wants to compute the net salary of each group of employee based on the category of the employee such as Category A$,$ Category B$,$ Category C$.$ Compute the net salary based on the following table.

$\backslash$table$[[$Category$,$Tax Deducted,Dearness Allowance$($DA$)],[$A$,\backslash$table$[[30\%$ of gross$],[$salary$]],80\%$ of basic salary$],[$B$,\backslash$table$[[20\%$ of gross$],[$salary$]],50\%$ of basic salary$],[$C$,\backslash$table$[[10\%$ of gross$],[$salary$]],30\%$ of basic salary$]]$