mysql select去重的五種方法

小樊
110
2024-06-25 09:24:30
欄目: 云計(jì)算

  1. 使用DISTINCT關(guān)鍵字

SELECT DISTINCT column_name FROM table_name;

  1. 使用GROUP BY子句

SELECT column_name FROM table_name GROUP BY column_name;

  1. 使用子查詢

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

  1. 使用HAVING子句

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

  1. 使用臨時(shí)表

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

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