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Returns the base-10 logarithm of x. If x is less than or equal to 0.0E0, the function returns NULL.

func.log10( <x> )
func.log10(100)
┌─────────────────┐
│ func.log10(100) │
├─────────────────┤
2
└─────────────────┘
LOG10( <x> )
SELECT LOG10(100);
┌────────────┐
log10(100) │
├────────────┤
2
└────────────┘