Sql distinct multiple columns

SQL SELECT with DISTINCT on multiple columns : Multiple fields may also be added with DISTINCT clause. DISTINCT will eliminate those rows where all the selected fields. 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.

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. Counting DISTINCT over multiple columns.

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. How do you select multiple columns from a table while ensuring that one specific column doesnt contain duplicate values? SELECT DISTINCT colcolcolcolfrom table This doesnt work, because.

Can anybody here help? Using SQL Server, I have. ID SKU PRODUCT ===== FOO-Orange BAR-Orange FOO-Apple FOO-Orange I want. COUNT DISTINCT for multiple columns. Well the title says it all.

If you apply the DISTINCT clause to a column that has NULL, the DISTINCT clause will keep only one NULL and eliminates the other. In other words, the DISTINCT clause treats all NULL “values” as the same value. For the demonstration, we will use the customers table from the sample database. You may also specify two or more columns as using the SELECT – DISTINCT clause. As such, our example table contains duplicate values for employees and their IDs, so it will be good learning to see how DISTINCT clause returns the records as using both these columns in the single query.

Rate this: Please or sign in to vote. I need to query an SQL database to find all distinct values of one column and I need an arbitrary value from another column. Ask Question Asked years, months ago.

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 primary key ensures that the table has no duplicate rows. However, when you use the SELECT statement to query a portion of the columns in a table, you may get duplicates. You can use DISTINCT on multiple columns. The DISTINCT keyword applies to the entire result set, so adding DISTINCT to your query with multiple columns will find unique.

SQL DISTINCT on Multiple Columns. It may be one or more. Assuming you are looking for the Top distinct combinations of C1-C Steve is close. However, having the Top inside of, or before, the DISTINCT may cause fewer than returned if there are any duplicates found.

Instea you would want to return a full list of all distinct value combinations, then limit it down to only the top 50. Solved: Is there a way to get distinct values for multiple columns ? It is then joining each of those sub selects together using the row number as the joining column. The FULL OUTER JOIN allows the join to happen where there are a different number of. Gnanesekhar select distinct (claimNumber, versionnumber) from claims this is the exact syntax I asked whether it will work. I dont think it works even with CTE right.

Did u try with dummy data. I tried seems its not working. Is there any reason that sql doesnt support a distinct on columns.