我应该更加强调“可读”部分。这是我现在汇总的内容。
WITH file_sizes AS
(SELECT 1048576 MEGABYTE, 1024 KILOBYTE,
DBMS_LOB.GETLENGTH (BLOB_COLUMN) byte_size
FROM BLOB_COLUMN)
SELECT (CASE TRUNC (byte_size / MEGABYTE)
WHEN 0
THEN TO_CHAR ((byte_size / KILOBYTE), '999,999') || ' KB'
ELSE TO_CHAR ((byte_size / MEGABYTE), '999,999.00') || ' MB'
END
) display_size
FROM file_sizes
Output:
DISPLAY_SIZE
--------------
1.88 MB
433 KB
540 KB
333 KB
1.57 MB
1.17 MB
602392714
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