The GROUP BY makes the result set in summary rows by the value of one or more columns. The DISTINCT keyword eliminates duplicate records from the results. I have a mytable structured as follows and I would like to count occurences of values for attribute in each row: id | attribute ----- 1 | spam 2 | egg 3 | spam With. For the demo, I am using employee table that stores the information about the employees. Sometimes we want to count the total number of distinct values. The following shows how use a simple SQL statement to create a list of unique values and a count of their occurrences from a table. COUNT() function and SELECT with DISTINCT on multiple columns. It operates on a single column. You can use the COUNT function in the SELECT statement to get the number of employees, the number of employees in each department, the number of employees who hold a specific job, etc. Here we will have to use SQL Count function and distinct clauses together within SQL Select statement. different) values. In other words, the DISTINCT clause treats all NULL “values” as the same value.. SQL Server SELECT DISTINCT examples For example, find out the count of unique gender in the Customer table. Person_ID: Person: 1: Tim: 2: Tom: 3: Jim: 4: Bob: 5: Tim: 6: Jim: 7: Bob: 8: Bob: This SQL statement. Each same value on … [Master] GROUP BY [ValueA] If you're not using MS SQL, you'll need to use the proper SQL for your DB. The function returns only count for the rows returned after DISTINCT clause. You can use the count() function in a select statement with distinct on multiple columns to count the distinct rows. The COUNT() function accepts a clause which can be either ALL, DISTINCT, or *:. The query uses the combination of values in all specified columns in the SELECT list to evaluate the uniqueness.. SQL COUNT ( ) with group by and order by . Here, this query looks at a single field at a time, returns the distinct values of one column and the count of each of those distinct values. The SQL COUNT function is an aggregate function that returns the number of rows returned by a query. Introduction to SQL COUNT function. SELECT DISTINCT [ValueA] as Values, COUNT(*) as [RecordCount] FROM [dbo]. SELECT * FROM #MyTable AS mt CROSS APPLY ( SELECT COUNT(DISTINCT mt2.Col_B) AS dc FROM #MyTable AS mt2 WHERE mt2.Col_A = mt.Col_A -- GROUP BY mt2.Col_A ) AS ca; The GROUP BY clause is redundant given the data provided in the question, but may give you a better execution plan. For example, if we had a table that looked like. DISTINCT for multiple columns is not supported. COUNT(*) function returns the number of items in a group, including NULL and duplicate values. id | attribute | count ----- 1 | spam | 2 2 | egg | 1 SQL SELECT DISTINCT Statement How do I return unique values in SQL? It then returns the number of product_version values in records with the specific product_key value. DISTINCT can be used with aggregates: COUNT, AVG, MAX, etc. SQL Count Distinct Values. SELECT id, attribute, COUNT(attribute) FROM mytable GROUP BY attribute I only get. This query selects each distinct product_key value, counts the number of distinct date_key and warehouse_key values for all records with the specific product_key value, and then sums all qty_in_stock values in records with the specific product_key value. COUNT(DISTINCT expression) function returns the number of unique and non-null items in a group. In this page, we are going to discuss the usage of GROUP BY and ORDER BY along with the SQL COUNT() function. The example of COUNT function with DISTINCT. If the Projection clause does not specify the DISTINCT or UNIQUE keyword of the SELECT statement, the query can include multiple COUNT functions that each includes the DISTINCT or UNIQUE keyword as the first specification in the argument list, as in the following example: SELECT COUNT (UNIQUE item_num), COUNT (DISTINCT order_num) FROM items; COUNT(ALL expression) evaluates the expression and returns the number of non-null items in a group, including duplicate values. Here is an example: SELECT COUNT(*) FROM ( SELECT DISTINCT agent_code, ord_amount,cust_code FROM orders WHERE agent_code='A002'); Output: If you apply the DISTINCT clause to a column that has NULL, the DISTINCT clause will keep only one NULL and eliminates the other. SELECT DISTINCT returns only distinct (i.e. You may also use the COUNT SQL function for getting the number of records as using the DISTINCT clause. Using employee table that looked like unique gender in the SELECT list to evaluate the... 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