使用JOIN操作
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sql实现列转行的方法是什么
使用SQL中的CASE语句和聚合函数，将列转换为行。SELECT id, MAX(CASE WHEN column_name = 'column1' THEN value END) AS column1, MAX(CASE WHEN column_name = 'column2' THEN value END) AS column2 FROM table_name;
使用SQL中的CASE语句和聚合函数，将列转换为行。SELECT id, MAX(CASE WHEN column_name = 'column1' THEN value END) AS column1, MAX(CASE WHEN column_name = 'column2' THEN value END) AS column2 FROM table_name;
