How do I use distinct in multiple columns in SQL?
DISTINCT on multiple columns
- Sample Select statement.
- Select with distinct on two columns.
- Select with distinct on three columns.
- Select with distinct on all columns of the first query.
- Select with distinct on multiple columns and order by clause.
- Count() function and select with distinct on multiple columns.
Can we use distinct on multiple columns in MySQL?
MySQL DISTINCT with multiple columns When you specify multiple columns in the DISTINCT clause, the DISTINCT clause will use the combination of values in these columns to determine the uniqueness of the row in the result set.
How do I use distinct for only one column in MySQL?
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.
Can you count two columns in SQL?
You can use CASE statement to count two different columns in a single query. To understand the concept, let us first create a table.
Can distinct command be used for more than one column?
The DISTINCT clause is used in the SELECT statement to remove duplicate rows from a result set. The DISTINCT clause keeps one row for each group of duplicates. The DISTINCT clause can be applied to one or more columns in the select list of the SELECT statement.
How to use distinct with two columns in SQL?
Example: SELECT with DISTINCT on two columns. To get the identical rows (based on two columns agent_code and ord_amount) once from the orders table, the following SQL statement can be used : SQL Code: SELECT DISTINCT agent_code,ord_amount FROM orders WHERE agent_code=’A002′; Output:
How to count the number of distinct rows in a column?
You can use the count () function in a select statement with distinct on multiple columns to count the distinct rows. Here is an example: SELECT COUNT(*) FROM (SELECT DISTINCT agent_code, ord_amount, cust_code FROM orders WHERE agent_code =’A002′);
How to get identical rows on all columns of the first query?
Pictorial presentation: Example : SELECT with DISTINCT on all columns of the first query. To get the identical rows (on four columns agent_code, ord_amount, cust_code, and ord_num) once from the orders table , the following SQL statement can be used : SQL Code:
How to use ORDER BY clause in select statement with distinct?
You can use an order by clause in the select statement with distinct on multiple columns. Here is an example: You can use the count () function in a select statement with distinct on multiple columns to count the distinct rows.