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SQLite DISTINCTThe keyword is used in conjunction with the SELECT statement to eliminate all duplicate records and obtain only unique records.
When there are multiple duplicate records in a table, this situation may occur. It is more meaningful to obtain unique records rather than duplicate records when retrieving such records.
Here is the basic syntax for using the DISTINCT keyword to eliminate duplicate records.
SELECT DISTINCT column1, column2,.....columnN FROM table_name WHERE [condition]
Consider the COMPANY table with 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's take a look at how the following SELECT query returns duplicate salary records.
sqlite> SELECT name FROM COMPANY;
This will produce the following result.
NAME ---------- Paul Allen Teddy Mark David Kim James Paul James James
Now, let'sDISTINCTUse the keyword in the above SELECT query and view the results.
sqlite> SELECT DISTINCT name FROM COMPANY;
This will produce the following result, with no duplicate entries.
NAME ---------- Paul Allen Teddy Mark David Kim James