Mysql count distinct multiple columns

You can use the count () function in a select statement with distinct on multiple columns to count the distinct rows. Select with distinct on multiple columns and order by clause. You can use an order by clause in select statement with distinct on multiple columns.

For example, in the customers table, we have many rows whose state column has NULL values. Ask Question Asked years, months ago. Active months ago. I wrote a script that runs each time a user logs into a computer in our domain. This script makes a record of the.

Well the title says it all. 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.

I am also grouping by the Column that I am joining both of these tables on. What I am trying to achieve is to sum distinct values of the amount column , but I want the rows to be made distinct by their primary key bva. VendorAdjustmentID not by their value.

Has anyone got an idea of how this might be done? I have tried experimenting with nested counts and distinct values (where I was able to filter to one column but not both). DISTINCT operates on a single column. The query to create a table is as followsmysql. If you do select more than one column , all columns are combined to create the uniqueness of the row.

Example to get distinct values of a Column. In this example, we shall consider the following table data. For age column , there are two distinct values 10. For section column , there are three distinct values A, B, C. For gender column , there are two distinct values M, F. The columns have duplicate data.

I have a report that includes different columns of 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.

I tried using :- select distinct batch, date, serial number,P_I Operator from tester. Instead I got lots of rows despite of the fixed number of batches. Where did I go wrong?

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. SQL COUNT ( ) with All.