什么是最好的算法来找到一个没有使用的表，该表可以容纳一百万行

To elaborate .. a) A table (BIGTABLE) has a capacity to hold a million rows with a primary Key as the ID. (random and unique) b) What algorithm can be used to arrive at an ID that has not been used so far. This number will be used to insert another row into table BIGTABLE.To elaborate .. a) A table (BIGTABLE) has a cap