Firebird 2.1 Language Reference Update

Internal functions
• This function fully supports text BLOBs of any length, including those with a multi-byte character
set.
• If string is a BLOB, the result is a BLOB. Otherwise, the result is a VARCHAR(n) with n the
length of the input string.
• If the length argument exceeds the string length, the input string is returned unchanged.
• If the length argument is not a whole number, bankers' rounding (round-to-even) is applied, i.e.
0.5 becomes 0, 1.5 becomes 2, 2.5 becomes 2, 3.5 becomes 4, etc.
See also: RIGHT()
Available in: DSQL, PSQL
Added in: 2.1
LN()
Description: Returns the natural logarithm of the argument.
Result type: DOUBLE PRECISION
Syntax:
LN (number)
• An error is raised if the argument is negative or 0.
See also: EXP()
Important
If the external function LN 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
Description: Returns the x-based logarithm of y.
Result type: DOUBLE PRECISION
Syntax:
LOG (x, y)
LOG()
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