Can we use distinct for multiple columns?

Can we use distinct for multiple columns?

Answer. Yes, the DISTINCT clause can be applied to any valid SELECT query. It is important to note that DISTINCT will filter out all rows that are not unique in terms of all selected columns.

How can I get distinct count of multiple columns in SQL?

How to count distinct values over multiple columns using SQL

  1. Method-1 Using a derived table (subquery) You can simply create a select distinct query and wrap it inside of a select count(*) sql, like shown below:
  2. Method-2 Using Concatenated columns.
  3. Method-3 If performance is a factor.

How do I select distinct on all columns?

The DISTINCT keyword is applied to all columns. It means that the query will use the combination of values in all columns to evaluate the distinction. If you want to select distinct values of some columns in the select list, you should use the GROUP BY clause.

How can I get distinct values of all columns in SQL?

MySQL – Distinct Values To get unique or distinct values of a column in MySQL Table, use the following SQL Query. SELECT DISTINCT(column_name) FROM your_table_name; You can select distinct values for one or more columns. The column names has to be separated with comma.

How do I select multiple columns with only one group?

Sql-server – How to select multiple columns but only group by one

  1. Add the additional columns to the GROUP BY clause: GROUP BY Rls.RoleName, Pro.[ FirstName], Pro.[ LastName]
  2. Add some aggregate function on the relevant columns: SELECT Rls.RoleName, MAX(Pro.[FirstName]), MAX(Pro.[LastName])

How do I get unique two columns in SQL?

If you want distinct values from only two fields, plus return other fields with them, then the other fields must have some kind of aggregation on them (sum, min, max, etc.), and the two columns you want distinct must appear in the group by clause.

How do I select all unique records in SQL?

SELECT DISTINCT returns only unique (i.e. distinct) values. SELECT DISTINCT eliminates duplicate values from the results. DISTINCT can be used with aggregates: COUNT, AVG, MAX, etc. DISTINCT operates on a single column.

How do you select distinct records?

The unique values are fetched when we use the distinct keyword.

  1. SELECT DISTINCT returns only distinct (different) values.
  2. DISTINCT eliminates duplicate records from the table.
  3. DISTINCT can be used with aggregates: COUNT, AVG, MAX, etc.
  4. DISTINCT operates on a single column.

How do I select distinct values in SQL?

How do you select distinct records based on one column?

“sql select unique rows based on a column” Code Answer’s

  1. DISTINCT.
  2. – select distinct * from employees; ==>
  3. retrieves any row if it has at.
  4. least a single unique column.
  5. – select distinct first_name from employees; ==>
  6. retrieves unique names.
  7. from table. ( removes duplicates)

How do I SELECT other columns with group by?

do your group by and join the same table on the ID of the table….All i have to do is:

  1. create WITH CTE_Name subquery with your GroupBy column and COUNT condition.
  2. select all(or whatever you want to display) from value table and the total from the CTE.
  3. INNER JOIN with CTE on the ID(primary key or unique constraint) column.

How do I SELECT multiple columns with only one group in SQL Server?

2 Answers

  1. Add the additional columns to the GROUP BY clause: GROUP BY Rls.RoleName, Pro.[FirstName], Pro.[LastName]
  2. Add some aggregate function on the relevant columns: SELECT Rls.RoleName, MAX(Pro.[FirstName]), MAX(Pro.[LastName])

How do I use distinct in SQL query?

Using SQL DISTINCT. The SQL Distinct command can be used in the SELECT statement to ensure that the query returns only distinct (unique) rows. When the query is selecting the rows it discards any row which is a duplicate of any other row already selected by the query.

How do I Count unique in SQL Server?

Count all the DISTINCT program names by program type and push number. SELECT COUNT(DISTINCT program_name) AS Count, program_type AS [Type] FROM cm_production WHERE [email protected]_number GROUP BY program_type. DISTINCT COUNT(*) will return a row for each unique count.

What is SELECT DISTINCT in MySQL?

The MySQL Select Distinct behaviour is inherits from the Group By. If you use the Group By Clause without any Aggregate Function then it will act as the Distinct keyword. And the Only difference between them is: Group By will sort the Data first, and then perform grouping. Distinct keyword does not perform any sorting.

What is distinct clause in SQL?

In SQL Server, DISTINCT clause is used to remove duplicates from the table. The DISTICT clause is only used with SELECT statement. Syntax: expressions: It specifies the columns or calculations that you want to retrieve.