using CASE in the WHERE clause

Question

simplified version of my query

SELECT *
FROM logs 
WHERE pw=\'correct\' AND CASE WHEN id<800 THEN success=1 ELSE END 
AND YEAR(timestamp)=2011 

Answer 1

You can transform logical implication A => B to NOT A or B. This is one of the most basic laws of logic. In your case it is something like this:

SELECT *
FROM logs 
WHERE pw='correct' AND (id>=800 OR success=1)  
AND YEAR(timestamp)=2011

I also transformed NOT id<800 to id>=800, which is also pretty basic.