Sql server replace empty string with null I came up with this code: An empty string takes 2 bytes, so NULL is more efficiently stored; IS NULL checks use the NULL bitmap = an optmisation; When indexed, a NULL adds a NULL bitmap to each index entry = larger index. Thanks. Try SELECT 1 + NULL or 'abc' + NULL. SQL Server: replace by NULL. If a literal NULL is provided as check_expression and no replacement_value is provided, returns Jun 6, 2024 · In this article, we explored several techniques for identifying NULLs and empty values within a column. NULLs are sorted before the empty strings. Per the docs, ISNULL. Replacing Null Entries with a Zero. Empty string won't (still 2 bytes though). – Nov 17, 2015 · You can't get an empty string because you're returning the DATE value type from ISNULL. fxjwkfduiilaymrkeyounhgcyghrkjrjxotbsyluvctqgfmmcymxjyqfzzpcllveytm