title: Difference between tables with the same structure
body: <p>I have two tables with the same structure and with slightly different rows - Table A, and Table B.
  I would like to extract all the rows that are contained in table A but not in Table B.
  CAn you help me do that?</p>
  
  <p>By the way - Table A is in definition form, it does not previously created.</p>
  
  <p>And additionaly - I have 15 sql scripts to analyse. 
  I would like to find some software that can help me with visualization of the entire proces (composed of 15 sql scripts).
  Can you suggest something good?</p>