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SQL statement updates

Select More Fields to Avoid SELECT DISTINCT

SELECT DISTINCT is a handy way to remove duplicates from a query. SELECT DISTINCTworks by GROUPing all fields in the query to create distinct results. To accomplish this goal however, a large amount of processing power is required. Additionally, data may be grouped to the point of being inaccurate. To avoid using SELECT DISTINCT, more fields should be selected to create unique results.

Inefficient and inaccurate:

SELECT DISTINCT FirstName, LastName, State
FROM Customers

This query doesn’t account for multiple people in the same state having the same first and last name. Popular names such as David Smith or Diane Johnson will be grouped together, causing an inaccurate number of records. In larger databases, a large number of David Smith’s and Diane Johnson’s will cause this query to run slowly.

Efficient and accurate:

SELECT FirstName, LastName, Address, City, State, Zip
FROM Customers

By adding more fields, unduplicated records were returned without using SELECT DISTINCT. The database does not have to group any fields, and the number of records is accurate.


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