Select all distinct mysql

1. How to SELECT distinct all columns in MySQL?
2. How to SELECT distinct rows in MySQL?
3. How do I SELECT distinct on all columns in a table?
4. Does SELECT distinct apply to all columns?
5. Does select distinct * work?
6. Which command gives all the distinct values?
7. How do I get a distinct list?
8. How do I SELECT without duplicates in SQL?
9. How to use distinct in MySQL?
10. What is distinct all in SQL?
11. How can I get distinct values for multiple columns in MySQL?
12. How do I use distinct instead of group by?
13. Why you shouldn't use SELECT distinct?
14. Is SELECT distinct faster than GROUP BY?
15. Is SELECT distinct faster than SELECT?
16. Can I use distinct with multiple columns MySQL?
17. Can you do distinct multiple columns?
18. How to select distinct two columns in MySQL?
19. How do you select unique columns?
20. Is SELECT distinct better than GROUP BY?
21. Can I use distinct with Listagg?
22. How do I use distinct instead of GROUP BY?
23. What is distinct all in SQL?
24. How to use distinct in MySQL?

How to SELECT distinct all columns 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.

How to SELECT distinct rows in MySQL?

Introduction to MySQL DISTINCT clause

When querying data from a table, you may get duplicate rows. To remove these duplicate rows, you use the DISTINCT clause in the SELECT statement. In this syntax, you specify one or more columns that you want to select distinct values after the SELECT DISTINCT keywords.

How do I SELECT distinct on all columns in a table?

SELECT DISTINCT FIELD1, FIELD2, FIELD3 FROM TABLE1 works if the values of all three columns are unique in the table. If, for example, you have multiple identical values for first name, but the last name and other information in the selected columns is different, the record will be included in the result set.

Does SELECT distinct apply to all columns?

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

Does select distinct * work?

The DISTINCT keyword in the SELECT clause is used to eliminate duplicate rows and display a unique list of values. In other words, the DISTINCT keyword retrieves unique values from a table.

Which command gives all the distinct values?

In MongoDB, the distinct() method finds the distinct values for a given field across a single collection and returns the results in an array.

How do I get a distinct list?

Select(x => x. Author). Distinct(); This will return a sequence ( IEnumerable<string> ) of Author values -- one per unique value.

How do I SELECT without duplicates in SQL?

If you want the query to return only unique rows, use the keyword DISTINCT after SELECT . DISTINCT can be used to fetch unique rows from one or more columns. You need to list the columns after the DISTINCT keyword.

How to use distinct in MySQL?

We can use the MySQL DISTINCT clause to return a single field that removes the duplicates from the result set. For example: SELECT DISTINCT state FROM customers; This MySQL DISTINCT example would return all unique state values from the customers table.

What is distinct all in SQL?

If the ALL keyword is specified, the query does not eliminate duplicate rows. This is the default behavior if neither ALL nor DISTINCT is specified. If the DISTINCT keyword is specified, a query eliminates rows that are duplicates according to the columns in the SELECT clause.

How can I get distinct values for multiple columns in MySQL?

To select distinct values in two columns, you can use least() and greatest() function from MySQL.

How do I use distinct instead of group by?

When and where to use GROUP BY and DISTINCT. DISTINCT is used to filter unique records out of the records that satisfy the query criteria. The "GROUP BY" clause is used when you need to group the data and it should be used to apply aggregate operators to each group.

Why you shouldn't use SELECT distinct?

“DISTINCT”: An Expensive Keyword

This requires: a lot of CPU — comparing large amounts of rows is hard work… loads of memory to store all rows — all rows need to be compared to each other, which means you need them all available in memory (even if only a hash, depending on low level algorithm implementation)

Is SELECT distinct faster than GROUP BY?

DISTINCT is used to filter unique records out of all records in the table. It removes the duplicate rows. SELECT DISTINCT will always be the same, or faster than a GROUP BY.

Is SELECT distinct faster than SELECT?

Most of the SELECT DISTINCT queries will perform exactly as fast as their simple SELECT counterparts, because the optimizer will do away with the step necessary for eliminating duplicates.

Can I use distinct with multiple columns MySQL?

We can use the DISTINCT clause on more than columns in MySQL. In this case, the uniqueness of rows in the result set would depend on the combination of all columns.

Can you do distinct multiple columns?

You can use DISTINCT when you select a single column, or when you select multiple columns as we did in our example.

How to select distinct two columns in MySQL?

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.

How do you select unique columns?

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.

Is SELECT distinct better than GROUP BY?

In summary: GROUP BY is slightly faster than SELECT DISTINCT.

Can I use distinct with Listagg?

With the DISTINCT option, the processing to remove duplicate values can be done directly within the LISTAGG function. The result is simpler, faster, more efficient SQL. Save this answer.

How do I use distinct instead of GROUP BY?

When and where to use GROUP BY and DISTINCT. DISTINCT is used to filter unique records out of the records that satisfy the query criteria. The "GROUP BY" clause is used when you need to group the data and it should be used to apply aggregate operators to each group.

What is distinct all in SQL?

If the ALL keyword is specified, the query does not eliminate duplicate rows. This is the default behavior if neither ALL nor DISTINCT is specified. If the DISTINCT keyword is specified, a query eliminates rows that are duplicates according to the columns in the SELECT clause.

How to use distinct in MySQL?

We can use the MySQL DISTINCT clause to return a single field that removes the duplicates from the result set. For example: SELECT DISTINCT state FROM customers; This MySQL DISTINCT example would return all unique state values from the customers table.