Difference between sati and sampajanna What is the difference between sati (mindfulness) and sampajañña (awareness, clear comprehension)?

Please provide examples.
Sati means to 'remember' (SN 48.10) or 'bring to &amp; keep in mind' (MN 117). 

Sampajana is situational wisdom; the right or thorough understanding of or for a situation. 

Sampajana is from the words saṃ &amp; pajāna (cp. pajānāti). It appears suttas such as MN 118, AN 3.121 &amp; SN 12.28 indicate mere pajānāti might be a level of knowing or recognition that is not as complete as sampajana. 

For example, in MN 118, pajānāti is only used with the most basic practise, namely, knowing long &amp; short breathing. In AN 3.121, pajānāti is used for the recognition of the arising of defilements (which means the mind does not have thorough understanding; if defilements are arising). In SN 12.28, pajānāti of Dependent Origination is called 'one endowed with a trainee’s knowledge’; ‘one who has entered the stream of the teaching’. Thus, mere pajānāti appears different to saṃ + pajāna, namely, "thorough" or "complete" understanding. 

While the suttas do not explain much about sampajana, when SN 47.35 briefly defines 'sampajana', it uses the word "vidita" (pp. of vindati), which means "to understand" or "understood", as Bhikkhu Bodhi appeared to properly translate as "understood" (and Sujato &amp; Thanissaro improperly translated as "known"). 


  And how, bhikkhus, does a bhikkhu exercise clear comprehension? Here, bhikkhus, for a bhikkhu feelings are understood as they arise,
  understood as they remain present, understood as they pass away.
  Thoughts are understood as they arise, understood as they remain
  present, understood as they pass away. Perceptions are understood as
  they arise, understood as they remain present, understood as they pass
  away. It is in this way, bhikkhus, that a bhikkhu exercises clear
  comprehension.
  
  Bhikkhu Bodhi


Thus, it appears obvious "sampajjana" means to thoroughly or completely understand something or a situation with right understanding rather than to have mere "bare awareness". "Bare awareness" without understanding (similar to a small child ignorantly looking non-judgmentally at the ocean, not understanding its danger) is not "sampajana". 

For example, in MN 66 and SN 12.17, the word "vidita" means "to understand" rather than merely "experience with bare awareness", as follows:


  Because I understand the diversity of faculties as it applies to this person.
  
  Indriyavemattatā hi me, udāyi, imasmiṃ puggale viditā.
  
  MN 66
  
  
  
  However, I have recognized individual differences.
  
  Api ca mayā puggalavemattatā viditā”ti.
  
  SN 12.17


MN 66 &amp; SN 12.17 seem to show Bhikkhu Sujato and particularly Bhikkhus Thanissaro (with his "bare awareness") provide inaccurate translations &amp; explanations of SN 47.35. 

In summary, sati delivers &amp; maintains sampajjana. They work together. 

Please refer to Ajahn Jayasaro You Tube or Ajahn Buddhadasa Part II. The Use of Dhamma.