Histogram displays

Histograms store information about the distribution of values in a column. Table 6-7 shows the commands that create and update histograms and which columns are affected.

**Table 6-7: Commands that create histograms**
Command		Histogram for
create index		Leading column only
update statistics
	table_name or index_name	Leading column only
	column_list	Leading column only
update index statistics		All indexed columns
update all statistics		All columns