实例：
NORMALIZE_DECFLOAT(DECFLOAT(2.1)) = 2.1
NORMALIZE_DECFLOAT(DECFLOAT(-2.0)) = -2
NORMALIZE_DECFLOAT(DECFLOAT(1.200)) = 1.2
NORMALIZE_DECFLOAT(DECFLOAT(-120)) = -1.2E+2
NORMALIZE_DECFLOAT(DECFLOAT(120.00)) = 1.2E+2
NORMALIZE_DECFLOAT(DECFLOAT(0.00)) = 0
NORMALIZE_DECFLOAT(-NAN) = -NaN
NORMALIZE_DECFLOAT(-INFINITY) = -Infinity
还有很多系统函数，如数学函数，sin,cos,tan，exp等，
详细信息参照官网：http://pic.dhe.ibm.com/infocenter/
db2luw/v9r7/index.
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位置：数据库基础 -> SQL -> Functions