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详细说明： Ranking family - This family supports business questions like “show the top 10 and bottom 10 salesperson per each region” or “show, for each region, salespersons that make up 25% of the sales”. The functions examine the entire output before producing an answer. Oracle provides RANK, DENSE_RANK, PERCENT_RANK, CUME_DIST and NTILE functions. · Window Aggregate family - This family addresses questions like “show the 13-week moving average of a stock price” or “show cumulative sum of sales per each region.” The new features provide m oving and cumulative processing for all the SQL aggregate functions including AVG, SUM, MIN, MAX, COUNT, VARIANCE and STDDEV. · Reporting Aggregate family - One of the most common types of calculations is the comparison of a non-aggregate value to an aggregate value. All percent-of-total and market share calculations require this processing. The reporting aggregate family makes these sort of calculations simple: it lets users place values calculated at different aggregation levels on the same row. Without needing a join operation, users can now compare aggregate values to the detail rows. The new family provides reporting aggregate processing for all SQL functions including AVG, SUM, MIN, MAX, COUNT, VARIANCE and STDDEV. · LAG/LEAD family - Studying change and variation is at the heart of analysis. Necessarily, this involves comparing the values of different rows in a table. While this has been possible in SQL, usually through self-joins, it has not been efficient or easy to formulate. The LAG/LEAD family enables queries to compare different rows of a table simply by specifying an offset from the current row. ...展开收缩
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