I have a few columns that I know won’t be used initially. Is it a good practice to add columns only when needed or just leave those extra columns there?
Is it just a little more space in the header or every row?
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I have a few columns that I know won’t be used initially. Is it a good practice to add columns only when needed or just leave those extra columns there?
Is it just a little more space in the header or every row?
Depends on the column type to some extent.
Variable sized columns (such as
varchar(n)) will only use 4 extra bytes (approx) per row.I would add columns only when required, since it is less likely that redundant columns will be added and never removed.