Fonction de cumul et pourcentage au total

Question

J'ai essayé d'afficher l'utilisation de l'espace de table en utilisant une fonction ROLLUP et le résultat semble bon. Cependant, comme vous pouvez le voir, percent_free d'un Total est juste une somme au lieu de Percentage. Pouvez-vous m'aider à modifier la requête ci-dessous pour obtenir une valeur en pourcentage d'un total?

SELECT nvl(df.tablespace_name,'Total') TABLESPACE, 
    sum(df.total_space_mb) TOTAL_SPACE_MB, 
    sum((df.total_space_mb - fs.free_space_mb)) USED_SPACE_MB, 
    sum(fs.free_space_mb) FREE_SPACE_MB, 
    sum(ROUND(100 * (fs.free_space/df.total_space),2)) PERCENT_FREE 
FROM (SELECT tablespace_name, SUM(bytes) TOTAL_SPACE, 
    ROUND(SUM(bytes)/1048576) TOTAL_SPACE_MB 
    FROM dba_data_files 
    GROUP BY tablespace_name) df, 
    (SELECT tablespace_name, SUM(bytes) FREE_SPACE, 
    ROUND(SUM(bytes)/1048576) FREE_SPACE_MB 
    FROM dba_free_space 
    GROUP BY tablespace_name) fs 
WHERE df.tablespace_name = fs.tablespace_name(+) 
GROUP BY rollup(df.tablespace_name) 
ORDER BY df.tablespace_name 


TABLESPACE  TOTAL_SPACE_MB USED_SPACE_MB FREE_SPACE_MB PERCENT_FREE 
--------------- -------------- ------------- ------------- ------------ 
DEMO      1500   47   1453  96.87 
NORMAL      10    1    9  88.75 
SYSAUX     7990   7600   390   4.88 
SYSTEM      970   961    9   .9 
UNDOTBS1     1690   24   1666  98.57 
USERS      5275   964   4311  81.73 
Total     17435   9597   7838  371.7 

Answer 1

Vous pouvez utiliser DECODE pour cela:

DECODE(df.tablespace_name, NULL, 
     ROUND(100*SUM(fs.FREE_SPACE)/SUM(df.total_space),2), 
     SUM(ROUND(100 * (fs.free_space/df.total_space),2))) PERCENT_FREE, 

Quand il est la ligne 'Total' (nom_espace_table null) utilisez la ronde sommes sur la table. Calculez ensuite les autres lignes comme d'habitude dans la clause else du DECODE.

SELECT nvl(df.tablespace_name,'Total') TABLESPACE, 
    sum(df.total_space_mb) TOTAL_SPACE_MB, 
    sum((df.total_space_mb - fs.free_space_mb)) USED_SPACE_MB, 
    sum(fs.free_space_mb) FREE_SPACE_MB, 
    DECODE(df.tablespace_name, NULL, 
     ROUND(100*SUM(fs.FREE_SPACE)/SUM(df.total_space),2), 
     SUM(ROUND(100 * (fs.free_space/df.total_space),2))) PERCENT_FREE 
FROM (SELECT tablespace_name, SUM(bytes) TOTAL_SPACE, 
    ROUND(SUM(bytes)/1048576) TOTAL_SPACE_MB 
    FROM dba_data_files 
    GROUP BY tablespace_name) df, 
    (SELECT tablespace_name, SUM(bytes) FREE_SPACE, 
    ROUND(SUM(bytes)/1048576) FREE_SPACE_MB 
    FROM dba_free_space 
    GROUP BY tablespace_name) fs 
WHERE df.tablespace_name = fs.tablespace_name(+) 
GROUP BY rollup(df.tablespace_name) 
ORDER BY df.tablespace_name