Sql count distinct multiple columns

You can use count () function in a select statement with distinct on multiple columns to count the distinct rows. Ask Question Asked years, month ago. Viewed 404k times 181. Count distinct value pairs in multiple columns in.

We can count during aggregation using GROUP BY to make distinct when needed after the select statement to show the data with counts. Remember that you must include. SELECT COUNT(DISTINCT ) error on. This is a simple question : I want to create a table selecting distinct observations from an existing table based on combination of three columns but I want to retain. The problem with your query is that when using a GROUP BY clause (which you essentially do by using distinct ) you can only use columns that you group by or aggregate functions.

You cannot use the column id because there are potentially different values. In your case there is always only one value because of the HAVING clause, but most RDBMS are not smart enough to recognize that. Rate this: Please or sign in to vote. For the demonstration, we will use the customers table from the sample database.

DISTINCT can be used with aggregates: COUNT , AVG, MAX, etc. The AskTOM team is taking a break over the holiday season. You can still search the repository of over 20questions answered.

Thanks for being a member of the AskTOM commu. Active years, months ago. Supposing we have a table with four columns (a,b,c,d) of the same data type. Is it possible to select all distinct values. How do you select multiple columns from a table while ensuring that one specific column doesnt contain duplicate values?

SQL COUNT ( ) with All. Im trying to find any duplicate addresses by finding distinct matches across multiple columns. When I run the above I get complaints that Addressisnt in the.

Here is my probleThe business requires a measure to be created that involves identifying the distinct count of a field for various columns in specific dimensions. Is there an easier way of doing a COUNT(DISTINCT) on multiple items than converting them to strings and concatenating them? However, one other important point is that a tuple is counted only if none of the individual values in the tuple is null. Since the query is meant to be universal for multiple columns of numeric and alphanumeric data and can be expanded for multiple columns , I am simply trying to get a basic skeleton that works for an on the fly analysis. The primary key ensures that the table has no duplicate rows.

Hello All, how to get the distinct count with multiple columns in select and group by statements. Without columns i am getting the different count , with. FROM table_name When called on one column it gives back only distinct values of that column. What happens when we use it with multiple columns and should we ever do this? Hi This is my sample Data set, I need a distinct count of the country and Month Combination by using PowerPivot DAX formulas.

I have attached a sample data set from the Values below if i take unique Country and Month Combination i should get 3. Can anybody here help?