我需要计算一天中创建的每个文件的每天记录的平均值和大小(以 MB 为单位)。整整一年
I need to count the average of each day's records and size in MB for each file created in a day. For a whole year
几次尝试都不成功后,我请求你的帮助。
我正在学习 PL SQL。我正在使用 Oracle SQL developer v.20
我有这种情况。我的数据集如下所示:
id_file size_byte created_at
_________ _________ ____________________________
1 45323 17-FEB-22 17:21:13,726874000
2 41232 17-FEB-22 17:21:13,740587004
3 1234456 20-FEB-22 17:25:13,368874058
4 233545488 20-FEB-22 17:21:18,400049000
5 233545488 21-FEB-22 18:11:18,058746868
所以我想要的 2022 年输出是这样的:
TOT_records AVG_file_created_for_day TOT_size_files AVG_size_files_created_each_day
___________ ________________________ ______________ _______________________________
9.999.999 10.000 999.999.999 5 MB (default is byte)
ID 是 NUMBER 类型,SIZE_BYTE 是 NUMBER 类型,CREATED_AT 是 TIMESTAMP(6)
我的 table 是每年分区的,PARTITION_DATE 是 DATE
类型
“每天平均文件大小”之类的内容有些含糊不清...可能是:
- 总计所有文件大小/总天数,或
- 每天文件大小的平均值,然后取该平均值的平均值
无论如何,这里有一些东西可以让你继续下去(我假设上面是后者)
SQL> create table t as
2 select
3 rownum id_file,
4 dbms_random.value(1000,20000000) bytes,
5 date '2021-01-01' + dbms_random.value(1,700) created_at
6 from dual
7 connect by level <= 5000;
Table created.
SQL>
SQL> select * from t
2 where rownum <= 20;
ID_FILE BYTES CREATED_A
---------- ---------- ---------
1 19305636.7 02-SEP-22
2 6305773.83 10-OCT-21
3 11939117.8 04-NOV-21
4 11039507.9 01-SEP-21
5 15555516.8 02-NOV-22
6 2809048.47 13-SEP-22
7 2070381.41 18-DEC-21
8 11116786.1 11-MAR-22
9 17519679.8 21-DEC-21
10 6728222.84 02-APR-22
11 7569442.31 07-AUG-22
12 16949454.2 06-JUL-21
13 8019443.02 03-JUN-21
14 13147674.9 31-AUG-21
15 14590702.5 16-JUL-22
16 13028609.7 11-MAY-21
17 5466477.07 06-APR-22
18 4469902.12 08-MAY-21
19 14511096 31-MAY-22
20 5245726.03 12-JUL-21
20 rows selected.
SQL> select
2 count(*) total_records,
3 avg(daily_size_avg)/1024/1024 avg_size_files_per_day_mb,
4 sum(bytes)/1024/1024/1024 tot_bytes_gb,
5 avg(files_per_day) avg_files_per_day
6 from
7 (
8 select
9 bytes,
10 avg(bytes) over ( partition by trunc(created_at) ) daily_size_avg,
11 count(*) over ( partition by trunc(created_at) ) files_per_day
12 from t
13 );
TOTAL_RECORDS AVG_SIZE_FILES_PER_DAY_MB TOT_BYTES_GB AVG_FILES_PER_DAY
------------- ------------------------- ------------ -----------------
5000 9.5313187 46.5396421 8.092
几次尝试都不成功后,我请求你的帮助。
我正在学习 PL SQL。我正在使用 Oracle SQL developer v.20
我有这种情况。我的数据集如下所示:
id_file size_byte created_at
_________ _________ ____________________________
1 45323 17-FEB-22 17:21:13,726874000
2 41232 17-FEB-22 17:21:13,740587004
3 1234456 20-FEB-22 17:25:13,368874058
4 233545488 20-FEB-22 17:21:18,400049000
5 233545488 21-FEB-22 18:11:18,058746868
所以我想要的 2022 年输出是这样的:
TOT_records AVG_file_created_for_day TOT_size_files AVG_size_files_created_each_day
___________ ________________________ ______________ _______________________________
9.999.999 10.000 999.999.999 5 MB (default is byte)
ID 是 NUMBER 类型,SIZE_BYTE 是 NUMBER 类型,CREATED_AT 是 TIMESTAMP(6)
我的 table 是每年分区的,PARTITION_DATE 是 DATE
类型“每天平均文件大小”之类的内容有些含糊不清...可能是:
- 总计所有文件大小/总天数,或
- 每天文件大小的平均值,然后取该平均值的平均值
无论如何,这里有一些东西可以让你继续下去(我假设上面是后者)
SQL> create table t as
2 select
3 rownum id_file,
4 dbms_random.value(1000,20000000) bytes,
5 date '2021-01-01' + dbms_random.value(1,700) created_at
6 from dual
7 connect by level <= 5000;
Table created.
SQL>
SQL> select * from t
2 where rownum <= 20;
ID_FILE BYTES CREATED_A
---------- ---------- ---------
1 19305636.7 02-SEP-22
2 6305773.83 10-OCT-21
3 11939117.8 04-NOV-21
4 11039507.9 01-SEP-21
5 15555516.8 02-NOV-22
6 2809048.47 13-SEP-22
7 2070381.41 18-DEC-21
8 11116786.1 11-MAR-22
9 17519679.8 21-DEC-21
10 6728222.84 02-APR-22
11 7569442.31 07-AUG-22
12 16949454.2 06-JUL-21
13 8019443.02 03-JUN-21
14 13147674.9 31-AUG-21
15 14590702.5 16-JUL-22
16 13028609.7 11-MAY-21
17 5466477.07 06-APR-22
18 4469902.12 08-MAY-21
19 14511096 31-MAY-22
20 5245726.03 12-JUL-21
20 rows selected.
SQL> select
2 count(*) total_records,
3 avg(daily_size_avg)/1024/1024 avg_size_files_per_day_mb,
4 sum(bytes)/1024/1024/1024 tot_bytes_gb,
5 avg(files_per_day) avg_files_per_day
6 from
7 (
8 select
9 bytes,
10 avg(bytes) over ( partition by trunc(created_at) ) daily_size_avg,
11 count(*) over ( partition by trunc(created_at) ) files_per_day
12 from t
13 );
TOTAL_RECORDS AVG_SIZE_FILES_PER_DAY_MB TOT_BYTES_GB AVG_FILES_PER_DAY
------------- ------------------------- ------------ -----------------
5000 9.5313187 46.5396421 8.092