Microsoft SQL: Get freespace in database file
Microsoft SQL allocate space in database files even if there is no data. To see how much data there is in a database you can query database.
SELECT DB_NAME() AS DbName,
name AS FileName,
type_desc,
size/128.0 AS CurrentSizeMB,
size/128.0 - CAST(FILEPROPERTY(name, 'SpaceUsed') AS INT)/128.0 AS FreeSpaceMB
FROM sys.database_files
WHERE type IN (0,1);
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