How can I delete duplicate records in SQL using distinct?

The go to solution for removing duplicate rows from your result sets is to include the distinct keyword in your select statement. It tells the query engine to remove duplicates to produce a result set in which every row is unique. The group by clause can also be used to remove duplicates.

Does select distinct remove duplicates?

The DISTINCT keyword eliminates duplicate rows from a result. Note that the columns of a DISTINCT result form a candidate key (unless they contain nulls).

How do I select without duplicates in SQL?

SELECT DISTINCT returns only unique values (without duplicates). DISTINCT operates on a single column. DISTINCT can be used with aggregates: COUNT, AVG, MAX, etc.

Does SQL query eliminate duplicates?

We can use the SQL RANK function to remove the duplicate rows as well. SQL RANK function gives unique row ID for each row irrespective of the duplicate row. In the following query, we use a RANK function with the PARTITION BY clause.

What can be used instead of distinct in SQL?

6 Answers. GROUP BY is intended for aggregate function use; DISTINCT just removes duplicates (based on all column values matching on a per row basis) from visibility. If TABLE2 allows duplicate values associated to TABLE1 records, you have to use either option.

How do you delete duplicate records in MySQL and keep one record?

MySQL Delete Duplicate Records

1. Delete Duplicate Record Using Delete Join. We can use the DELETE JOIN statement in MySQL that allows us to remove duplicate records quickly.
2. Delete Duplicate Record Using the ROW_NUMBER() Function.
3. DELETE Duplicate Rows Using Intermediate Table.

Which statement can be used to remove duplicates?

Explanation. Answer : DISTINCT. The SQL DISTINCT keyword is used after the SELECT statement and is used to eliminate all the duplicate records and fetch the unique records.

How do I count distinct values in SQL?

To count the number of different values that are stored in a given column, you simply need to designate the column you pass in to the COUNT function as DISTINCT . When given a column, COUNT returns the number of values in that column. Combining this with DISTINCT returns only the number of unique (and non-NULL) values.

What is select distinct in SQL?

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.

Can I use group by instead of distinct?

Well, GROUP BY and DISTINCT have their own use. GROUP BY cannot replace DISTINCT in some situations and DISTINCT cannot take place of GROUP BY. It is as per your choice and situation how you are optimizing both of them and choosing where to use GROUP BY and DISTINCT.

What can we use instead of distinct?

Synonyms & Antonyms of distinct

• different,
• disparate,
• dissimilar,
• distant,
• distinctive,
• distinguishable,
• diverse,
• nonidentical,

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