Sql server replace empty string with null Here's why this works: If you select a date which is NULL, it will show return NULL, though it is really stored as 01/01/1900. 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. So in some cases, rather than having NULL fields we end-up with empty fields. 000 when the date is 1/1/1900. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. Returns the same type as check_expression. ',',') Sep 9, 2023 ยท Using COALESCE to replace empty strings with NULL can lead to data loss or incorrect interpretations of your data. However, every time there is a cell that doesn't have data, it outputs NULL into the cell. How to use coalesce instead of IS NULL> 1. Note: The search is case-insensitive. wrgwwtiwdgergydinkbqigjcrbsqlczpgnunmenwvcnyoqogxvzxmpsmzzkklltvtlwwwzdrx