sql return 0 if it is null w/ SELECT * COUNT, SQL queries

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Please give me any advise.

I need to print out include '0'.

For example, I want to do like below, which include value 'd' and '0' but my real queries only print out just until third line (c, 3)

des   num   
---------
 a     1   
 b     2     
 c     3     
 d     0

Here is my code

SELECT des, COUNT(*) AS num 
FROM table 
WHERE color = 'Red' AND day = 17 
GROUP BY des

I so appreciate any advise

The WHERE clause in your SQL statement limits the number of rows to be grouped to the ones having color='Red' and day=17. Among the rows returned to be grouped there isn't any row with des='d' and this is why you get this result. The below statement gets all the rows that your statement gets plus the ones that are excluded by color='Red' and day=17:

SELECT des, COUNT(*) AS num FROM table 
WHERE color='Red' and day=17 GROUP BY des
union
SELECT DISTINCT des, 0 AS num FROM table 
WHERE des NOT IN (SELECT des FROM table WHERE color='Red' and day=17)

Why does COUNT() aggregate return 0 for 'NULL'?, of the number of rows in the table as an integer. Search Sql Database. Visit Our Site for Amazing Savings.

use ‘coalesce ‘ ... im pretty sure there is a lot of example out there.. try this

  select coalesce(des, 0) as num

SQL COUNT function, Your original query should always return one row, with the count of all ISNULL​() for MS SQL Server, or COALESCE(); NVL() for Oracle,  SQL SERVER – How to return ‘0’ instead of NULL in a query resultset. In legacy data, it is very common that you find a lot of unnecessary NULL values and you need to do massage to present this data, whether it is a report or an email. Generally, we use few techniques to avoid NULL and replace it with any characters or numbers.

Simply use conditional aggregation:

SELECT des,
       SUM(CASE WHEN color = 'Red' AND day = 17 THEN 1 ELSE 0 END) AS num 
FROM table 
GROUP BY des;

This is probably the simplest method to achieve what you want.

PostgreSQL SUM Function, Sure, Query 1 is returning a null result, but whatever query is calling that should use isnull. Query 1: SELECT SUMMIT.CODE, isnull(COUNT(DISTINCT SUMMIT. To get a return of zero in SQL instead of getting no returns in some instances, there are two steps to follow: First, you can move the condition from the WHERE clause into the SELECT clause as a conditional count:

Insert Into SQL Null Values SQL Update SQL Delete SQL Select Top SQL Min and Max SQL Count, Avg, Look at the following SELECT statement: The MySQL IFNULL() function lets you return an alternative value if an expression is NULL: SELECT ProductName, UnitPrice * (UnitsInStock + IFNULL(UnitsOnOrder, 0)) if count value is null set it to zero - sql select statement. Can't seem to get this working. If the count is null I want to set it to zero else set it to the count. I am adding multiple counts in another part of my code so I cannot have null values when I do this.

A NULL in SQL simply means no value exists for the field. Using SELECT COUNT(*) or SELECT COUNT(1) (which is what I prefer to use) will return the total of all We'll be using the CASE statement to determine which rows have 0) )" would be the same thing as doing "COUNT( 0 )" or as I used in my  COUNT() function. 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. Syntax: COUNT(*) COUNT( [ALL|DISTINCT] expression ) The above syntax is the general SQL 2003 ANSI standard syntax.

It sets the number of rows or non NULL column values. COUNT() returns 0 if there were no matching rows. function, or column name and can also be the pieces of a SQL query that compare values against other values. SELECT( SELECT COUNT(*) FROM employees ) AS Total_Employees, (SELECT  SQL HOME SQL Intro SQL Syntax SQL Select SQL Select Distinct SQL Where SQL And, Or, Not SQL Order By SQL Insert Into SQL Null Values SQL Update SQL Delete SQL Select Top SQL Min and Max SQL Count, Avg, Sum SQL Like SQL Wildcards SQL In SQL Between SQL Aliases SQL Joins SQL Inner Join SQL Left Join SQL Right Join SQL Full Join SQL Self Join SQL

Comments
  • Try using SUM instead of COUNT and put your WHERE conditions inside of SUM. I am not sure about sqlite syntax. Mysql version: SELECT des, SUM(IF(color='Red' and day=17, 1, 0)) AS num FROM table GROUP BY des
  • I dont know why but this one is not work for me. but thank you for answering my question !