Question

我有一个包含客户投资交易的数据库。对于每个季度（四个月），有一个期初余额，一个期末余额，以及之间的N个交易。

该表的结构如下：

transaction_id (primary key)
investment_id (index, foreign key)
amount (decimal(11,2))
type (ENUM:'Opening','Closing','Transfer')
transaction_date (DATE)

我需要创建一个视图，对于每个investment_id，将检索“Opening”类型的第一个事务，“Closing”类型的最后一个事务，以及特定日期之间的“Transfer”类型的所有N个事务范围。但是，除了该范围内的端点之外，不应包括“打开”或“关闭”类型的事务。例如：

SELECT * FROM view_transactions
WHERE transaction_date > '2000-01-01' AND transaction_date < '2006-06-01'
AND investment_id = 6578734

谢谢！

Answer 1

CREATE FUNCTION pFunc1() returns DATE DETERMINISTIC NO SQL return @param;
CREATE FUNCTION pFunc2() returns DATE DETERMINISTIC NO SQL return @param;

CREATE VIEW view_transactions AS
   SELECT * 
   FROM transactions
   WHERE
        type = 'Opening' AND
        transaction_date > pFunc1() AND
        transaction_date < pFunc2()
   ORDER BY transaction_date
   LIMIT 1
   UNION
   SELECT *
   FROM transactions
   WHERE
        type = 'Transfer' AND
        transaction_date > pFunc1() AND
        transaction_date < pFunc2() AND
   UNION
   SELECT *
   FROM transactions
   WHERE
        type = 'Closing' AND
        transaction_date > pFunc1() AND
        transaction_date < pFunc2()
   ORDER BY transaction_date DESC
   LIMIT 1;

然后：

  SELECT v.*
  FROM (select @param:='2000-01-01' pFunc1) param1, (select @param:='2000-06-01' pFunc2) param2 view_transactions v;

MySQL Query在日期范围内获取端点？

1 个答案: