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Select distinct unique values only

suggest change 
SELECT DISTINCT ContinentCode
FROM Countries;

This query will return all DISTINCT (unique, different) values from ContinentCode column from Countries table

ContinentCode| —— OC| EU| AS| NA| AF|

SQLFiddle Demo

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SELECT:
* SELECT
* Using the wildcard character to select all columns in a query.
* SELECT Using Column Aliases
* Select Individual Columns
* Selecting specified number of records
* Selecting with Condition
* Selecting with CASE
* Select columns which are named after reserved keywords
* Selecting with table alias
* Selecting with more than 1 condition.
* Selecting with Aggregate functions
* Get aggregated result for row groups
* Selection with sorted Results
* Selecting without Locking the table
* Select with condition of multiple values from column
* Select distinct unique values only
* Selecting with null
* Select rows from multiple tables
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