MySQL COUNT(DISTINCT) function returns a count of number rows with different non-NULL expr values. 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 I am fairly new to SAS and still have trouble with some things. MySQL Version: 5.6 . The query returns 40 that includes the duplicate job id. Last updated: Wednesday, 26 October 2016. 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. The COUNT DISTINCT function returns the number of unique values in the column or expression, as the following example shows. SQL Distinct Values with Count What if we want to find the gender and their count in the customer table. 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. SQL COUNT(DISTINCT expression) example. Count function is a part of the SQL Server's aggregate functions. count(*) counts the total number of rows (in the group). Example: MySQL COUNT(DISTINCT) function. 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. The example of COUNT function with DISTINCT. SQL null is a state, not a value. When given a column, COUNT returns the number of values in that column. 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. Note: The usage of DISTINCT keyword is disallowed with ordered Window functions or Window frames. 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. The function returns only count for the rows returned after DISTINCT clause. Variable 1 (SDA) has 13 values and Variable 2 (FFYEAR) HAS 7 values. One NULL is not equal to another NULL and it is not same as zero. Syntax APPROX_COUNT_DISTINCT ( expression ) For example, if we had a table that looked like. This function returns the approximate number of unique non-null values in a group. In aggregates, we consider various types of functions like count, max, avg, min, and sum. Transact-SQL Syntax Conventions. Combining this with DISTINCT returns only the number of unique (and non-NULL) values. Count(All) and Count(Distinct) are two aggregate functions in SQL Server. For the demo, I am using employee table that stores the information about the employees. 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. Syntax: COUNT(DISTINCT expr,[expr...]) Where expr is a given expression. You may also use the COUNT SQL function for getting the number of records as using the DISTINCT clause. We can achieve this using group by clause with distinct clause and count function. Applies to: SQL Server 2019 (15.x) Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics. We expected to find the number of jobs that are holding by employees. Hi Everybody! Expression, as the following example shows, 26 October 2016 by Adrian Gordon 7 values NULL and it not. ( and non-NULL ) values variable 2 ( FFYEAR ) has 7 values is not same as zero the number... 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