How do you select unique values without using distinct in SQL?

How can I get unique records without using distinct in SQL?

SQL | Remove Duplicates without Distinct

  1. Remove Duplicates Using Row_Number. …
  2. 2.Remove Duplicates using self Join. …
  3. Remove Duplicates using group By.

How can I get distinct values without using distinct keyword?

SQL Puzzle | 5 Ways to GET DISTINCT DATA without using distinct Keyword | SQL Interview Question

  1. Using UNION.
  2. Using RowNumber.
  3. Using GroupBy.
  4. Using EXCEPT.
  5. Using INTERSECT.

How do I get only unique records 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 find unique values in a table?

The unique values are fetched when we use the distinct keyword.

  1. SELECT DISTINCT returns only distinct (different) values.
  2. DISTINCT eliminates duplicate records from the table.
  3. DISTINCT can be used with aggregates: COUNT, AVG, MAX, etc.
  4. DISTINCT operates on a single column.
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Is GROUP BY better than distinct?

While DISTINCT better explains intent, and GROUP BY is only required when aggregations are present, they are interchangeable in many cases.

Why distinct is bad in SQL?

Well, improper use of “distinct” not only hides the real problem (duplicate entries in the tables, lack of condition in the on clause) as discussed above but also degrades query performance. … This will bring the IO Cost (logical reads) of the query goes up significantly.

How do I stop distinct in SQL Server?

sorry, but question was NOT to advise which is better (Group by VS Distinct)… question is how to avoid these bad table design patterns and get best performance…

Kalman Toth SQL SERVER & BI TRAINING.

Kalman Toth
Joined Jun 2008
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What can I use instead of distinct in Oracle?

The DISTINCT operator causes Oracle to fetch all rows satisfying the table join and then sort and filter out duplicate values. EXISTS is a faster alternative, because the Oracle optimizer realizes when the subquery has been satisfied once, there is no need to proceed further and the next matching row can be fetched.

What is the keyword used in SQL to select unique records from a table?

The SQL DISTINCT keyword is used in conjunction with the SELECT statement to eliminate all the duplicate records and fetching only unique records.

How do I SELECT one column as distinct?

Adding the DISTINCT keyword to a SELECT query causes it to return only unique values for the specified column list so that duplicate rows are removed from the result set.

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What is the difference between unique and distinct in SQL?

The main difference between Unique and Distinct in SQL is that Unique helps to ensure that all the values in a column are different while Distinct helps to remove all the duplicate records when retrieving the records from a table.

How do you SELECT distinct from one column?

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

How do you select distinct values for multiple columns in SQL?

DISTINCT on multiple columns

  1. Sample Select statement.
  2. Select with distinct on two columns.
  3. Select with distinct on three columns.
  4. Select with distinct on all columns of the first query.
  5. Select with distinct on multiple columns and order by clause.
  6. Count() function and select with distinct on multiple columns.