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mysql sql DISTINCT delete duplicate records

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mysql tutorial sql distinct delete duplicate records

How to use the distinct keyword in mysql to filter the list of duplicate values ​​in a select statement

If you want to delete duplicate data when querying data, you can use the distinct keyword to filter duplicate values.

select distinct column_name from table_name;

Let's take a look at a simple example where we have a car list. Each car has an id, brand, type and color, but for now we simply list all brands:

select brand from car;
the result is: audi audi audi bmw bmw lexus lexus

As you can see the brand shows several times. But what we want is to know how many different brands are in db. To get this extended query, look like this

select distinct brand from car;
the result is:
audi bmw
lexus



If you want to know how many different brands, then we must use the count group by to achieve the following example


select brand, count (brand) from car group by brand;
and the result is: brand count (brand)
audi 3
bmw 2
lexus 2

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