If you only want to match "" as an empty string. WHERE DATALENGTH(COLUMN) > 0. If you want to count any string consisting entirely of spaces as empty ... <看更多>

... USD 5.99/Month - https://bit.ly/all-courses-subscriptionIn this SQL Tutorial, we will learn about SQL IS NULL and IS NOT NULL. A field. ... <看更多>

Learn how to work with the NOT NULL Constraint in SQL, to enforce a column to have values i.e. not null. Remember, since columns can have ... ... <看更多>

Note that MS SQL does not follow this rule: multiple NULL values will violate a UNIQUE constraint. Fortunately, starting with 2008 you can use a filtered index ... ... <看更多>

I would like to have a filter that would contain 2 values in the dropdown - "is empty" and "is not empty", i.e. IS NULL and IS NOT NULL. I ... ... <看更多>