SQLite DISTINCT Keyword

The SQLite DISTINCT keyword is used in conjunction with SELECT statement to eliminate all the duplicate records and fetching only unique records.

 

There may be a situation when you have multiple duplicate records in a table. While fetching such records, it makes more sense to fetch only unique records instead of fetching duplicate records.

 

Syntax:

The basic syntax of DISTINCT keyword to eliminate duplicate records is as follows:

SELECT DISTINCT column1, column2, columnN

FROM table name

WHERE [condition]

 

Example:

Consider COMPANY table is having the following records:

 

ID          NAME        AGE         ADDRESS     SALARY

———-  ———-  ———-  ———-  ———-

1           Paul        32          California 20000.0

2           Allen       25          Texas       15000.0

3           Teddy       23          Norway      20000.0

4           Mark        25          Rich-Mond   65000.0

5           David       27          Texas       85000.0

6           Kim         22          South-Hall 45000.0

7           James       24          Houston     10000.0

8           Paul        24          Houston     20000.0

9           James       44          Norway      5000.0

10          James       45          Texas       5000.0

 

First, let us see how the following SELECT query returns duplicate salary records:

sqlite> SELECT name FROM COMPANY;

 

This would produce the following result:

 

NAME

———-

Paul

Allen

Teddy

Mark

David

Kim

James

Paul

James

James

 

Now, let us use DISTINCT keyword with the above SELECT query and see the result:

sqlite> SELECT DISTINCT name FROM COMPANY;

 

 

This would produce the following result, where we do not have any duplicate entry:

 

NAME

———-

Paul

Allen

Teddy

Mark

David

Kim

James

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