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Does the SQL Server decimal data type stored the actual number of digits after the decimal for each value in a column?
For example
UPDATE [Mixes] SET [Concentration] = 0.0012500 WHERE [Id] = 1
where
Concentration Decimal(21,11)
Is it possible to retrieve the exact “0.0012500” value as entered by the user, or is it necessary to store the actual number of decimal places entered in another column?
The decimal type stores the numeric value up to the precision specified. It does not store formatting. It’s like saving an int with leading zeros. The leading zeros don’t change the numeric value. If the user-entered format is needed, you’ll need to store that separately or store the number as a varchar.