The operator that matches exactly the rows this one doesn't, e.g. NotEqual for Equal and back, or undefined for an operator without one (the ordering operators: !(x > 5) also excludes NULLs, so it is not <=).
NotEqual
Equal
undefined
!(x > 5)
<=
The operator that matches exactly the rows this one doesn't, e.g.
NotEqualforEqualand back, orundefinedfor an operator without one (the ordering operators:!(x > 5)also excludes NULLs, so it is not<=).