column indicator信息详情
列指示器
indicator───n.指标，标志，迹象；指示器；[试剂]指示剂；[计]指示符；压力计
column───n.纵队，列；专栏；圆柱，柱形物
indicator variable───指标变数，指标变量；[统计]指示变量
flushness indicator───平齐度指示器
indicator constant───指示剂常数
fluted column───凹槽柱
column chromatography───柱层析（法），柱色谱（法）；柱层析法；[分化]柱色谱法
buckling column───屈曲柱
leading indicator───领先指标
RPG uses a 1 character field (like an indicator) to determine if a column contains nulls.───RPG 使用一个 1 字符字段（比如一个指示符）来确定列是否包含空值。
If the latter is true, then the indicator variable for that column is set to -5 which will set the column to the default value for that column.───如果是后一种情况，那么该列的指示符变量被设置为- 5，这将把该列的值设置为默认值。
If the former is true, then the indicator variable for that column is set to -1 which results in the column being updated with the null value.───如果是前一种情况，那么该列的指示符变量被设置为- 1，这导致该列被更新为空值。