Why is my query returning 0 rows?
Why is my query returning 0 rows?
The second most common issue that produces 0 rows returned is that the query is filtering out too much data in the WHERE or HAVING statement. To see if the WHERE or HAVING clause is too restrictive simply remove it from the query to see if any rows are returned.
How do I make a count 0 return in SQL?
An ugly workaround, if you want your original query to return a row with 0’s, when no records are present, is to add something like this to your query: UNION SELECT NULL AS [Month], 0 AS [COUNT], 0 AS [GRAMS], 0 AS [PRINCIPAL] WHERE (SELECT COUNT(*) FROM #AllExpired) = 0 , but a better solution would be to have your …
Does count () count NULL rows?
COUNT(expression) does not count NULL values.
Does count return 0 or NULL?
As all of your values are null, count(cola) has to return zero.
How do you assign a default value if no rows returned from the select query?
- ISNULL is the SQL Server equivalent to NVL… 🙂
- The question is how to return default values when there are NO rows returned.
- This query may still yield 0 records if no record matches where clause.
- Using the MIN function means that, if no rows match the conditions, a single row with a NULL value will be returned.
Does Count return NULL?
COUNT never returns null. The following example calculates, for each employee in the employees table, the moving count of employees earning salaries in the range 50 less than through 150 greater than the employee’s salary.
Does select return NULL?
The IS NULL condition is used in SQL to test for a NULL value. It returns TRUE if a NULL value is found, otherwise it returns FALSE. It can be used in a SELECT, INSERT, UPDATE, or DELETE statement.
Does COUNT Return 0 SQL?
The SQL COUNT() function returns the number of rows in a table satisfying the criteria specified in the WHERE clause. It sets the number of rows or non NULL column values. COUNT() returns 0 if there were no matching rows.
Does COUNT return NULL?
How do you set a default row for a query that returns no rows?
Does Count * count NULL?
COUNT DISTINCT does not count NULL as a distinct value. The ALL keyword counts all non-NULL values, including all duplicates. ALL is the default behavior if no keyword is specified.
How do I count with Isnull in SQL?
If you want the COUNT function to count all rows of a given column, including the null values, use the ISNULL function. The ISNULL function can replace the null value with a valid value. or other SET operation. (1) – NULL values are eliminated.
What does count 0 mean in SQL?
COUNT(*) will count the number of rows, while COUNT(expression) will count non-null values in expression and COUNT(column) will count all non-null values in column. Since both 0 and 1 are non-null values, COUNT(0)=COUNT(1) and they both will be equivalent to the number of rows COUNT(*) .
Does SELECT return NULL?
How do I assign a default value if no rows returned from the select query mysql?
SELECT COALESCE(col1, ‘defaultValue’) col1, COUNT(*) cRows FROM table1 WHERE colx = ‘filter’; This query returns 2 columns: The first is the value of the column searched with the default value set in case the row does not exist. The second column returns the number of rows with the filter in the table.
What does select COUNT (*) mean in SQL?
COUNT(*) returns the number of rows in a specified table, and it preserves duplicate rows. It counts each row separately. This includes rows that contain null values.