The ST_INFO master table has millions of rows that are updated very rarely. It has a STATE_CODE column that contains the value for 25 states. The table is frequently queried on the STATE_CODE column. Which type of index would you suggest to improve the query performance？（）
1、若a=5，b=3，c=4，逻辑表达式!（a+b）&；&；!c的值
若a=5，b=3，c=4，逻辑表达式!（a+b）&；&；!c的值为（）A0B-1C1D2
Before a Flashback Table operation，you execute the following command：  ALTER TABLE employees ENABL...
AMPS属于（）。A1GB2GC3GD4G
cAMP（cyclic AMP）
表达式10>5&&6%3的值是()A-1B非零值C0D1
6、What would the amps be at 240 volts wi
What would the amps be at 240 volts with an 8 ohm resistance?（）A32~5 ampsB25 ampsC1~5 ampsD30 am