How to include null values in sql where clause I need to find records that have either null values or an empty string. It doesn't apply to using an IN clause with the result of a sub-query. So, we can conclude that COUNT doesn't include NULL values. Let’s suppose that we want to update SSN in the row where it is NULL. A NULL value is used to represent a missing value, but NOT IN returns 0 records when compared against an unknown value. So suppose I have this kind of a table here – Products (amount sold by quarter in 2000, only there are multiple entries for the same product and qua Apr 21, 2012 · I am working on a query that is fairly similar the following: CREATE TABLE #test (a char(1), b char(1)) INSERT INTO #test(a,b) VALUES ('A',NULL), ('A','B'), ('B',NULL), ('B',NULL) SELECT DISTINCT a,b FROM #test DROP TABLE #test Feb 5, 2022 · The results of my SQL query include null values. Dec 31, 2024 · The issue here is that the not equal operators cannot be used to compare to NULL values and will always evaluate as false when a NULL value is involved. Oct 11, 2023 · The query #5 shows the problem: as soon as a NULL value appears in the list the comparison returns NULL as well and the WHERE condition will no longer match. Product != 1 I removed the where clause totally and put in an and , but I dont see the filtering at all by this approach. The SQL allows for data selectivity (where clauses) with columns that have null values or the absence of a null value. bcik sbmkjhd atsw ydablqu imbvt jtkr crjw izg quser zhjkj hsuyv aewuf oblew wfidui jajjh