在SQL Server中,可以使用以下方法来对字段进行去重:
SELECT DISTINCT column_name
FROM table_name;
SELECT column_name
FROM table_name
GROUP BY column_name;
SELECT column_name
FROM (
SELECT column_name, ROW_NUMBER() OVER (PARTITION BY column_name ORDER BY column_name) as row_num
FROM table_name
) t
WHERE t.row_num = 1;
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