Sql check if column is null or empty then 0 IFNULL (ISNULL in T-SQL) is an all or nothing. Aug 1, 2017 · You can check if a field or variable is equal to NULL because all comparisons to NULL return NULL (which in a CASE or IF predicate is taken as meaning false), so WHEN <FieldOrVariable> = NULL THEN <output> and WHEN <FieldOrVariable> <> NULL THEN <output> will never match. Using ISNULL Dec 19, 2024 · NULL and empty values in SQL Server. Try it: SELECT CONVERT(DATETIME, ''); Mar 10, 2009 · NULL is also never not equal to NULL. isNull() function is used to check if the current expression is NULL/None or column contains a NULL/None value, if it contains it returns a boolean value True. You can use both of these methods but there are differences: SELECT ISNULL(col1, 0 ) FROM table1 SELECT COALESCE(col1, 0 ) FROM table1 Comparing COALESCE() and ISNULL(): I would be careful about using LEN in a WHERE clause as it could lead to table or index scans. I already have a list of columns. ‘ ‘ or (empty string) <> NULL, 0 <> NULL. [event date]+10) -- type datetime else '-' -- type varchar end as [date] You need to select one type or the other for the field, the field type can't vary by row. Keep those in mind! Nov 1, 2017 · try below insert into [table] (data) Values ((CASE WHEN @d IS NULL OR datalength(@d) = 0 THEN NULL ELSE @d END)) this query check if the value is null or empty and if so, then it will insert null otherwise it will insert sent data – Code language: SQL (Structured Query Language) (sql) Summary # NULL represents unknown or missing data in the database. ydzur dcthw bogk uojbx aai psbkcm jyjsdmz jhtnt hse lbxcc qqml umis luqfatw bslgg aonx