[英]Oracle analytical query
所有,我需要一些帮助来编写查询,这是数据的片段......
TABLE_NAME SIZE_BYTES DATE
---------------------------------------- --------------- ---------
TABLE_A 346,817,560,576 17-SEP-16
TABLE_A 346,817,560,576 18-SEP-16
TABLE_A 369,046,323,200 19-SEP-16
TABLE_A 413,623,386,112 20-SEP-16
TABLE_A 466,840,715,264 21-SEP-16
TABLE_B 42895409152 17-SEP-16
TABLE_B 42962518016 18-SEP-16
TABLE_B 43163844608 19-SEP-16
TABLE_B 43365171200 20-SEP-16
TABLE_B 43566497792 21-SEP-16
17-SEP-2016 是基线,每天计算增长,因此 19-SEP-16 的数据增长是通过将 19-SEP-2016 size_bytes 减去 18-SEP-16 size_bytes。
我希望实现的是以这种格式显示数据
TABLE_NAME DATE SIZE_DELTA
------------- ----------- --------------
TABLE_A 17-SEP-16 346,817,560,576
18-SEP-16 0
19-SEP-16 22,228,762,624
20-SEP-16 44,577,062,912
21-Sep-16 53,217,329,152
TABLE_B 17-Sep-16 42895409152
18-Sep-16 67108864
19-Sep-16 201326592
20-Sep-16 201326592
21-Sep-16 201326592
使用 LAG 功能: https : //docs.oracle.com/cd/E11882_01/server.112/e41084/functions082.htm#SQLRF00652
SELECT table_name, date,
size_bytes - lag( size_bytes, 1, 0 )
OVER ( partition by table_name order by date ) As SIZE_DELTA
FROM tablename;
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