How can we check in a SQL Server
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
WHERE COLUMN <> ''
Both of these will not return
NULL values when used in a
WHERE clause. As
NULL will evaluate as
UNKNOWN for these rather than
CREATE TABLE T ( C VARCHAR(10) ); INSERT INTO T VALUES ('A'), (''), (' '), (NULL); SELECT * FROM T WHERE C <> ''
Returns just the single row
A. I.e. The rows with
NULL or an empty string or a string consisting entirely of spaces are all excluded by this query.