The Superhero Database Classification number, or SHDB Class, is a number that represents the overall 'power' of a character. All traits of a character are used for calculating the Classification.
What it DOESN'T mean
This doesn't mean that a higher class would always beat a lower class character. But the bigger the difference in Class is, the more obvious it is who'll win in a fight.
How is this calculated
( INT^1.3 + (STR*0.5 )^2 + (SPE*0.5)^2 + DUR^1.6 + (POW + (SPS*SPL))^2 + COM^1.8 ) ^ TIER
Super Power Score and Level
Every Super Power has a score (SPS) that is used to calculate the Class. Each Super Power also has 3 levels (SPL). The level is set when connecting that Super Power to a character. The level determines the final score, of the Super Power, being used in the calculation.
In Hesiod's Titanomachy, when Zeus fights Cronus, things like these happen:
καῦμα δὲ θεσπέσιον κάτεχεν χάος· εἴσατο δ' ἄντα
ὀφθαλμοῖσιν ἰδεῖν ἠδ' οὔασιν ὄσσαν ἀκοῦσαι
αὔτως, ὡς ὅτε γαῖα καὶ οὐρανὸς εὐρὺς ὕπερθε
πίλνατο· τοῖος γάρ κε μέγας ὑπὸ δοῦπος ὀρώρει,
τῆς μὲν ἐρειπομένης, τοῦ δ' ὑψόθεν ἐξεριπόντος·
which roughly translates to:
Heat and embers engulfed the entire Chaos,
and one could see with eyes and hear with one's ears
the bluster of earth and heaven crumbling and falling ...
You get the idea. Chaos is the primordial concept of empty space / Nothingness itself, so being able to set even something like that ablaze (with heat and embers) could scale Zeus to Low 1-A.
If it were "only" the part about the crumbling of Heaven & Earth, ok, then Low 2-C / 2-C would be good enough to scale Zeus, but it's the interaction with Chaos which could be Low 1-A.
Self-evidently, Zeus is also at least Nigh-Omnipotent,considering he controls and commands all other Gods (no matter what their specialty may be).
depending on the author, Chaos is one of the only few primordial beings who has Acausality (== no other cause preceeds it), at least according to Hesiod.
But according to Homer, that same role of being the acausal "source of all" was given to Okeanos, who is "only" a (primordial, but not acausal <- because he was born from Gaia) Titan in Hesiod's story.
But the important thing to rremember is that eventually Zeus inherited the supreme power to control ALL other beings, gods, entities, so even when Zeus himself is not 100% acausal (he also had a preceeding cause = his father Cronus and Mother Rhea), he is still Nigh-Omnipotent.