- 使用 DISTINCT 关键字：
SELECT DISTINCT column1, column2
FROM table_name;- 使用 GROUP BY 子句：
SELECT column1, column2
FROM table_name
GROUP BY column1, column2;- 使用窗口函数（ROW_NUMBER()）：
WITH CTE AS (
SELECT column1, column2, ROW_NUMBER() OVER (PARTITION BY column1, column2 ORDER BY column1) AS rn
FROM table_name
)
SELECT column1, column2
FROM CTE
WHERE rn = 1;- 使用临时表：
CREATE TABLE temp_table AS
SELECT DISTINCT column1, column2
FROM table_name;
SELECT * FROM temp_table;
