FirebirdSQL logo
 Procedural SQL (PSQL) StatementsAggregate Functions 

LOG()

Logarithm with variable base

Result type

DOUBLE PRECISION

Syntax
LOG (x, y)
Table 1. LOG Function Parameters
Parameter Description

x

Base.An expression of a numeric type

y

An expression of a numeric type

Returns the x-based logarithm of y.

  • If either argument is 0 or below, an error is raised.

  • If both arguments are 1, NaN is returned.

  • If x = 1 and y < 1, -INF is returned.

  • If x = 1 and y > 1, INF is returned.

See also

[fblangref50-scalarfuncs-power], [fblangref50-scalarfuncs-ln], [fblangref50-scalarfuncs-log10]

LOG10()

Decimal (base-10) logarithm

Result type

DOUBLE PRECISION

Syntax
LOG10 (number)
Table 1. LOG10 Function Parameter
Parameter Description

number

An expression of a numeric type

An error is raised if the argument is negative or 0.

See also

[fblangref50-scalarfuncs-power], [fblangref50-scalarfuncs-ln], [fblangref50-scalarfuncs-log]