mysql select去重的五种方法

1. 使用DISTINCT关键字

SELECT DISTINCT column_name FROM table_name;

2. 使用GROUP BY子句

SELECT column_name FROM table_name GROUP BY column_name;

3. 使用子查询

SELECT column_name FROM table_name WHERE column_name IN (SELECT DISTINCT column_name FROM table_name);

4. 使用HAVING子句

SELECT column_name FROM table_name GROUP BY column_name HAVING COUNT(column_name) = 1;

5. 使用临时表

CREATE TEMPORARY TABLE temp_table AS SELECT DISTINCT column_name FROM table_name; SELECT * FROM temp_table;

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