Firebird 2.1 Language Reference Update

Internal functions
• If x is negative or y is negative, the result is always NaN.
• If x is positive and y is 0, +/-INF is returned, depending on x.
• Bug: If x = 1 and y >= 0 (but not 1), +/-INF is returned.
• Bug: If x = 0 and y > 0, the result is 0.
Important
If the external function LOG is declared in your database, it will override the internal function. To make the
internal function available, DROP or ALTER the external function (UDF).
Available in: DSQL, PSQL
Added in: 2.1
LOG10()
Description: Returns the 10-based logarithm of the argument.
Result type: DOUBLE PRECISION
Syntax:
LOG10 (number)
• If the argument is 0, -INF is returned. If the argument is negative, NaN is returned.
Important
If the external function LOG10 is declared in your database, it will override the internal function. To make the
internal function available, DROP or ALTER the external function (UDF).
Available in: DSQL, ESQL, PSQL
Added in: 2.0
Changed in: 2.1
LOWER()
Description: Returns the lower-case equivalent of the input string. The exact result depends on the character
set. With ASCII or NONE for instance, only ASCII characters are lowercased; with OCTETS, the entire string is
returned unchanged. Since Firebird 2.1 this function also fully supports text BLOBs of any length and character
set.
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