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