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SQL Installing SSMS
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SQL Syntax
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SQL Datatype
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SQL Database
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SQL Table
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SQL Select
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SQL Distinct
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SQL Count
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SQL Top
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SQL Aliases
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SQL In
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SQL Insert
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SQL Update
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SQL Null
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SQL Like
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SQL Wildcards
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SQL Nested Query
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SQL Between
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SQL Unique
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SQL Primary Key
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SQL Foreign Key
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SQL Check
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SQL Default
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SQL Database Diagram
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SQL Stored Procedures
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SQL Joins
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SQL Inner Join
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SQL Left Join
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SQL Right Join
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SQL Full Join
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SQL Trigger
SQL Select Distinct
The SQL DISTINCT command is used with the SELECT keyword to retrieve only distinct or unique data. In a table, there may be a chance to exist a duplicate value and sometimes we want to retrieve only unique values. In such scenarios, SQL SELECT DISTINCT statement is used.
Example:
SELECT DISTINCT column_name , column_name FROM table_name;
Let’s try to understand it by the table given below
Here is a table of students from where we want to retrieve distinct information For example: distinct home-town.
SELECT DISTINCT home_town FROM students;
Now, it will return two rows.
Course Video
1. Write a SQL query to get unique cities AND PostalCode from Person_Address table.
[OUTPUT: 24 ROWS]
2. Write a SQL query to get unique CountryRegionCode from Sales_SalesTerritory table.
[OUTPUT: 6 ROWS]
3. Write a SQL query to get unique JobTitle from HumanResources_Employee table.
[OUTPUT: 24 ROWS]
4. Write a SQL query to get unique Title from Person_Person table.
[OUTPUT: 3 ROWS]
5. Write a SQL query to get unique productID from Sales_SalesOrderDetail table.
[OUTPUT: 45 ROWS]
YouTube Reference :
1) SQL Select Distinct in Hindi/Urdu
2) SQL Select Distinct in English
