If you specify a negative scale, Oracle Database rounds the actual data to the specified number of places to the left of the decimal point. For example, specifying (7,-2) means Oracle Database rounds to the nearest hundredths, as shown in Table 26-1.
McCann (2000) found that households in communities with good transit use save an average of about $3,000 annually on transportation costs. Litman (2004) found annual transportation cost savings of about $1,300 per household in cities with well-established rail transit systems compared with cities that lack rail.
The cost of professional transport varies widely, from about $0.50 per mile to about $2.00 per mile. This is partly due to region, transport costs in the UK are higher than in the USA, and transport costs in some states of the USA are higher than in others.