Option 4 problems well before Decorate House for rentalDesigning a building to book really , typically want to add your special impression for the place, smaller like to overstep ones guidelines, you will definitely eliminate your own advance payment and also make an investment lots of money straig...【阅读全文】
row_number() OVER (PARTITION BY COL1 ORDER BY COL2) 表示根据COL1分组,在分组内部根据 COL2排序,而此函数计算的值就表示每组内部排序后的顺序编号(组内连续的唯一的). 与rownum的区别在于:使用rownum进行排序的时候是先对结果集加入伪列rownum然后再进行排序,而此函数在包含排序从句后是先排序再计算行号码....【阅读全文】