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在 Oracle/PLSQL,  sign 函數(shù)返回一個(gè)值來(lái)說(shuō)明數(shù)字的符號(hào)，語(yǔ)法如下sign( number )If number < 0, then sign returns -1.If number = 0, then sign returns 0.If number > 0, then sign returns 1.For example:sign(-23)	would return -1sign(-0.001)	would return -1sign(0)	would return 0sign(0.001)	would return 1sign(23)	would return 1sign(23.601)	would return 1