sqlite
Database; use; embedded relational database
distinct
英[dɪˈstɪŋkt] US[dɪˈstɪŋkt ]
adj.Obvious, clear; outstanding, unusual; distinctive; exact
SQLite Distinct function syntax
Function:SQLite's DISTINCT keyword is used with the SELECT statement to eliminate all duplicate records and only obtain the unique record.
There may be a situation where there are multiple duplicate records in a table. The DISTINCT keyword is particularly meaningful when fetching such records, as it only fetches a unique record instead of duplicate records.
Syntax: The basic syntax of the DISTINCT keyword to eliminate duplicate records is as follows:
SELECT DISTINCT column1, column2,...columnN
FROM table_name
WHERE [condition]
SQLite Distinct function example
COMPANY 表有以下记录: 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 首先,让我们来看看下面的 SELECT 查询,它将返回重复的工资记录: sqlite> SELECT name FROM COMPANY; 这将产生以下结果: NAME ---------- Paul Allen Teddy Mark David Kim James Paul James James 现在,让我们在上述的 SELECT 查询中使用 DISTINCT 关键字: sqlite> SELECT DISTINCT name FROM COMPANY; 这将产生以下结果,没有任何重复的条目: NAME ---------- Paul Allen Teddy Mark David Kim James