How do I select the number of distinct multiple columns in SQL?

Can you select multiple distinct columns in SQL?

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. Feel free to test this out in the editor to see what happens!

How do I count distinct values for multiple columns in SQL?

but when we want to count distinct column combinations, we must either clumsily concatenate values (and be very careful to choose the right separator): select count(distinct col1 || '-' || col2) from mytable; or use a subquery: select count(*) from (select distinct col1, col2 from mytable);

How do I select all distinct columns in SQL?

The SQL SELECT DISTINCT Statement The SELECT DISTINCT statement is used to return only distinct (different) values. Inside a table, a column often contains many duplicate values; and sometimes you only want to list the different (distinct) values.

How do I select multiple distinct columns in mysql?

Linked1Select DISTINCT multiple columns MySQL.2Group by on multiple columns with inner join.3Using GROUP BY with CursorLoader - Android.4-2. ... 5Select multiple distinct columns from same table separately.6Select distinct on multiple columns with where statement.7Active Record (MYSQL) - Select distinct ids from multiple columns.