How do I select a distinct column in SQL?

How do I select a distinct column 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 you eliminate duplicate values in db2 select?

Show a select to delete duplicate rows.

1. If you have duplicate rows as the follow example: db2 “select * from rank order by cod”
2. You can put row number in your data output, perform the command below: db2 “SELECT ROWNUMBER() OVER (ORDER BY ) \
3. Then, You can delete the duplicate rows running the follow select:

How get unique values from single column 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.

Does SELECT distinct apply to all columns?

Yes, DISTINCT works on all combinations of column values for all columns in the SELECT clause.

How do you SELECT rows based on distinct values of a column only?

“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. ​
6. – select distinct first_name from employees; ==>
7. retrieves unique names.
8. from table. ( removes duplicates)

Can we apply distinct two 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 do I count unique values in db2?

The COUNT DISTINCT function returns the number of unique values in the column or expression, as the following example shows. SELECT COUNT (DISTINCT item_num) FROM items; If the COUNT DISTINCT function encounters NULL values, it ignores them unless every value in the specified column is NULL.

How do I delete duplicate records in SQL 400?

1. We can use the simple CPYF (Copy File) command.
2. Create the same file under a different name and define the whole field as key.
3. CPYF the original file to the new file with ERRLVL(*Nomax).
4. After the CPYF finished, you could copy the new file’s contents back to the original file with MBROPT(*Replace).

Can we apply distinct on two columns?

What does SELECT distinct do?

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.