sql not null
SELECT column_name FROM table_name
WHERE column_name IS NOT NULL;
sql not null
SELECT column_name FROM table_name
WHERE column_name IS NOT NULL;
t sql null or empty string
select * from vendor
where isnull(vendor_email,'') = ''
sql check for null and empty string
IF ISNULL(@param) OR @param = '' THEN doSomething...
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