How Do You Select Unique Records From A Table? SELECT DISTINCT returns only distinct (different) values. DISTINCT eliminates duplicate records from the table. DISTINCT can be used with aggregates: COUNT, AVG, MAX, etc. DISTINCT operates on a single column. How do I SELECT unique records from a table in SQL? The SELECT DISTINCT statement is
How Do You Select Rows Based On Distinct Values Of A Column Only In SQL? DISTINCT. – select distinct * from employees; ==> retrieves any row if it has at. least a single unique column. – select distinct first_name from employees; ==> retrieves unique names. from table. ( removes duplicates) How do you select
Does Distinct Affect Performance? Does distinct affect performance? 4 Answers. Yes, as using DISTINCT will (sometimes according to a comment) cause results to be ordered. Sorting hundreds of records takes time. Does distinct improve performance? Yes, the application needs to compare every record to the “distinct” records cache as it goes. You can improve performance