Oracle count distinct multiple columns

I can get the count for each column by doing. My problem is how can I get the count for both columns ? I am stuck on how to do the count over each individual column and then add it up. Any pointers would be appreciated. I have an oracle database table with a lot of columns.

You can select distinct for more than one column , however, the distinct refers to all the columns in the select list.

In your example, if you leave out the parens, it should work fine. If you need to select distinct values of only some columns , then you need to concatenate them as Brad suggested. 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.

You can use count () function in a select statement with distinct on multiple columns to count the distinct rows. I hope you enjoy this tutorial. Please subscribe my channel.

If this is your first visit, be sure to check out the FAQ by clicking the link above. DISTINCT for multiple columns is not supported.

You may have to register before you can post: click the register link above to proceed. Question: I need to display distinct records of each column within a single table. How do you write a SQL to select each distinct column within a table without using a function?

Answer: By Laurent Schneider, from his book ? Advanced Oracle SQL Programming? In this query we start by selecting the distinct values for all columns. This Video is in the continuation of previous video on SQL distinct with one column. COUNT function and multiple columns – Learn more on the SQLServerCentral forums.

I have a report that includes different columns of data. The columns have duplicate data. For each provider in column I would like to get a distinct count of other columns (age groups ) based on the customer column. Below are some of the columns of the report.

It seems the column of the country_test. Distinct Count of a Value across columns in the. There have been numerous times I have wanted to do this, but have not found an easy way.

In this instance I am selecting four columns and just want to distinct on the first column because the data of the four is different enough it returns duplicates of the first column. I need to query an SQL database to find all distinct values of one column and I need an arbitrary value from another column.

The order_by_clause and windowing_clause are not allowed. If you specify expr, then COUNT returns the number of rows where expr is not null. You can count either all rows, or only distinct values of expr. The following will make all three columns distinct.

I want only the Job_ID column to be distinct. Can this be done in Oracle ? If we include the columns to be returned (first name, last name,SSN), then the uniqueness of the rows is lost due to nature of the data in these columns. The table has about 1odd columns as part of the HRMS suite and the columns to be considered for performing distinct operation are about 40.

However, you want a running tally-mark. Using Multiple Columns in a Group: 2. The LATERAL keyword allows the right side of the join to reference objects from the left side. In this case, the right side is a VALUES constructor that builds a single- column subset out of the column values you want to put into a single column.

That gave me the correct count for the number of distinct detail items in my report. So with the Having Count (). It sets the number of rows or non NULL column values.

COUNT () returns if there were no matching rows.