sql,sql-server , Adding values of different sizes in SQL
Adding values of different sizes in SQL
Good day everyone, I am hoping someone could help me with an issue I am having. I have a database that stores the amount of data that was reviewed on a hard drive. The values can either be Megabytes or Gigabytes.
Hard Drive 1 100MB
Hard Drive 2 2.5 GB
Hard Drive 3 650 MB
My question is this. I need to add these values up to get a total amount of data that was reviewed. I need to convert the Megabytes to Gigabytes and then add all the values together to get a total.
Can I do this in a query, or would a function be better for something like this? And how would I go about doing this?
Thank you for your help in advance!
The basic idea is to get the size by
WHEN 'KB' THEN 1000 * 1000
WHEN 'MB' THEN 1000
WHEN 'GB' THEN 1
WHEN 'TB' THEN 0.001
Example for SQL Server:
DECLARE @Table table
INSERT @Table VALUES (100, 'MB'), (2.5, 'GB'), (650, 'MB')
-- Get size for all rows
Size / CASE Unit WHEN 'MB' THEN 1000 WHEN 'GB' THEN 1 END
) AS GB
-- Get total
CONVERT(decimal(18, 3), SUM(
Size / CASE Unit WHEN 'MB' THEN 1000 WHEN 'GB' THEN 1 END
)) AS GB
Size Unit GB
--------------------------------------- ---- ---------------------------------------
100.000 MB 0.01
2.500 GB 2.500
650.000 MB 0.650
(3 row(s) affected)
(1 row(s) affected)
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