Retrieving Distinct Rows
Note that the SELECT statement returns all rows in a given column. Nevertheless, what if we don't need all the values from a column (because they can be duplicated), and we only need unique values? For such cases, it is convenient to use the keyword DISTINCT. Moreover, this keyword is used immediately before the column names. Let's look at an example.
1SELECT DISTINCT region FROM country;
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You have to retrieve distinct (unique) continent values.
Soluzione
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Note that the SELECT statement returns all rows in a given column. Nevertheless, what if we don't need all the values from a column (because they can be duplicated), and we only need unique values? For such cases, it is convenient to use the keyword DISTINCT. Moreover, this keyword is used immediately before the column names. Let's look at an example.
1SELECT DISTINCT region FROM country;
Swipe to start coding
You have to retrieve distinct (unique) continent values.
Soluzione
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Awesome!
Completion rate improved to 16.67single
