Select distinct on one column

Ask Question Asked years, months ago. SQL - select distinct only on one column. See the locations table in the sample database. DISTINCT for only one Column - Stack. Max of CColumn record should be fine.

How would you do distinct on multiple columns? Can we exclude a column on select? How to get distinct column values? Can I combine two field in the same column? If you want to select distinct values of some columns in the select list, you should use the GROUP BY clause.

Active years, months ago. We will use the authors table from the sample database for the demonstration. For the demonstration, we will use the customers table from the sample database.

How do you select multiple columns from a table while ensuring that one specific column doesnt contain duplicate values? If you use one column , SQLite uses values in that column to evaluate the duplicate. The following will make all three columns distinct. I want only the Job_ID column to be distinct.

Can this be done in Oracle? I need to select one of each version in the data (using the code field) while keeping all the columns in the final output. I am selecting distinct on a code field but I cannot figure how to return the rest of the columns.

The issue is with this line. You can do it much faster by using a special formula, and in a moment I will show you this and a couple of other techniques. English is a tricky language. I need to eliminate rows with duplicate values in the EDNUM column keeping the row with the higher value in the SERVICE_PK column.

The result should look like the above. 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. 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. 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 within the data in the columns and return them as a single column or do I. Select distinct rows across dataframe. To simulate the select unique col_. If you specify one column , the database engine uses the values in the column to evaluate the uniqueness.

I have tried distinct and group by but none of them working. Now we are execute SELECT. I am using it for a special application, but i had to make the scenario simple to avoid explaining redundant information.

There is a ration behind this algorithm. If the SELECT clause contains more than one fiel the combination of values from all fields must be unique for a given record to be included in the.