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. This function returns the approximate number of unique non-null values in a group. You may also use the COUNT SQL function for getting the number of records as using the DISTINCT clause. Syntax: COUNT(DISTINCT expr,[expr...]) Where expr is a given expression. Count function is a part of the SQL Server's aggregate functions. SQL Distinct Values with Count What if we want to find the gender and their count in the customer table. Syntax APPROX_COUNT_DISTINCT ( expression ) Hi Everybody! Count(All) and Count(Distinct) are two aggregate functions in SQL Server. To get the number of jobs in the employees table, you apply the COUNT function to the job_id column as the following statement: SELECT COUNT (job_id) FROM employees; See it in action. For example, if we had a table that looked like. SQL null is a state, not a value. The COUNT DISTINCT function returns the number of unique values in the column or expression, as the following example shows. The example of COUNT function with DISTINCT. SQL COUNT(DISTINCT expression) example. MySQL Version: 5.6 . Note: The usage of DISTINCT keyword is disallowed with ordered Window functions or Window frames. count(*) counts the total number of rows (in the group). You should instead just count the distinct user: SELECT Time, COUNT(DISTINCT user) as total, Code FROM dbo.AnalyticsPause WHERE code = 'xxxx' GROUP BY Time, Code The function returns only count for the rows returned after DISTINCT clause. Example: MySQL COUNT(DISTINCT) function. MySQL COUNT(DISTINCT) function returns a count of number rows with different non-NULL expr values. I am fairly new to SAS and still have trouble with some things. In aggregates, we consider various types of functions like count, max, avg, min, and sum. To count the number of different values that are stored in a given column, you simply need to designate the column you pass in to the COUNT function as DISTINCT. Transact-SQL Syntax Conventions. Variable 1 (SDA) has 13 values and Variable 2 (FFYEAR) HAS 7 values. We can achieve this using group by clause with distinct clause and count function. Combining this with DISTINCT returns only the number of unique (and non-NULL) values. Last updated: Wednesday, 26 October 2016. SQL – How to count unique values in database Wednesday, 26 October 2016 by Adrian Gordon. I have a dataset and want to get the distinct count of members based on two variables. The query returns 40 that includes the duplicate job id. One NULL is not equal to another NULL and it is not same as zero. We expected to find the number of jobs that are holding by employees. SELECT COUNT (DISTINCT item_num) FROM items; If the COUNT DISTINCT function encounters NULL values, it ignores them unless every value in the specified column is NULL. When given a column, COUNT returns the number of values in that column. For the demo, I am using employee table that stores the information about the employees. Applies to: SQL Server 2019 (15.x) Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics. 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. Expected to find the gender and their count in the customer table with DISTINCT clause and count is! I am using employee table that stores the information about sql distinct count employees in Database,... 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