[英]MySQL stored procedure or dynamic view
我有以下准备好的语句来在三个表之间运行动态数据透视查询
SET @sql = NULL;
SELECT GROUP_CONCAT(DISTINCT CONCAT(
'max(case when division_id = ', dp.division_id, ' then process_name end) AS ', d.division_shortName, ' '
)
) INTO @sql
FROM
erp_divisionProcess dp LEFT JOIN erp_division d ON d.division_id = dp.division_id;
SET @sql = concat('SELECT ', @sql, 'FROM (
SELECT d.division_id, p.process_name, X.rnk
FROM erp_division d
LEFT JOIN (SELECT dp.division_id, dp.process_id, (SELECT COUNT(*) FROM erp_divisionProcess A WHERE dp.division_id = A.division_id AND dp.process_id < A.process_id) AS rnk
FROM erp_divisionProcess dp) X ON X.division_id = d.division_id
LEFT JOIN erp_BusinessProcess p ON p.process_id = X.process_id
) x
GROUP BY rnk');
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
产生像这样的数据集:
+-----------------+-----------------+------------+------------+--------------+------------+------------+-------+
| PBL | PLI | PMI | PBT | PBP | PBI | PBTL | PRDT |
+-----------------+-----------------+------------+------------+--------------+------------+------------+-------+
| Sales | Human Resources | Production | Purchasing | Sales | Purchasing | Purchasing | Sales |
| Human Resources | Purchasing | NULL | NULL | Purchasing | NULL | NULL | NULL |
| Purchasing | Finance | NULL | NULL | Distribution | NULL | NULL | NULL |
| Distribution | NULL | NULL | NULL | Production | NULL | NULL | NULL |
| Production | NULL | NULL | NULL | NULL | NULL | NULL | NULL |
| Finance | NULL | NULL | NULL | NULL | NULL | NULL | NULL |
+-----------------+-----------------+------------+------------+--------------+------------+------------+-------+
我希望生成的数据集可用于导入Excel,但是当我尝试运行完整语句时,MS Query会抛出错误。 我相信我无法从准备好的语句创建视图,因此如何在不每次都重新键入(复制并粘贴)查询结果并将其从MySQL中获取的情况下获得可用的查询结果。
谢谢!
我相信我无法从准备好的语句创建视图,因此如何在不重新输入(复制并粘贴)的情况下获得查询结果
您可以使用“准备查询”创建view
。
尝试在代码中进行以下更改:
-- SET @sql = concat('SELECT ', @sql, 'FROM (
SET @sql = concat( 'CREATE VIEW view_name AS SELECT ', @sql, ' FROM (
SELECT d.division_id, p.process_name, X.rnk
FROM erp_division d
LEFT JOIN (SELECT dp.division_id, dp.process_id,
(SELECT COUNT(*) FROM erp_divisionProcess A
WHERE dp.division_id = A.division_id
AND dp.process_id < A.process_id) AS rnk
FROM erp_divisionProcess dp) X
ON X.division_id = d.division_id
LEFT JOIN erp_BusinessProcess p ON p.process_id = X.process_id
) Y
GROUP BY rnk');
创建视图后,您可以select * from view_name
发出select * from view_name
以将数据提取到客户端。
演示 @ MySQL 5.5.32 Fiddle
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