與Postgres裏列的動態列表動態視圖

Question

我有一種情況如下：

表用戶 ID User viewname Description 1 JamesId employeeview This is a employee 2 FredId employeeview This is a employee 3 NickId managerview This is a manager

表性能 ID key value user_ref 1 name james 1 2 phone 88888888888 1 3 email test@test.com 3 4 name fred 2 5 phone 555555555555 2

我需要創建的意見如下：

Emp loyeeView Id empId name phone Description 1 JamesId james 88888888888 This is a employee 2 FredId fred 555555555555 This is a employee


ManagerView Id empId email Description 1 NickId test@test.com This is a manager

屬性表是擴展用戶表的一切是存儲爲鍵值對。需要使用上述兩個表動態創建視圖。屬性表是動態的。

是否可以生成這樣的視圖。有人可以舉個例子來做。

Answer 1

我設法在postgres中使用交叉表功能。然而，我不得不修改屬性表，以適應另一個colume作爲一個確定。

修改屬性表： ID key value user_ref identifier 1 name james 1 viewemployee 2 phone 88888888888 1 viewemployee 3 email test@test.com 3 viewmanager 4 name fred 2 viewemployee 5 phone 555555555555 2 viewemployee


SQL查詢使用交叉爲employeeview：

create MATERIALIZED VIEW EmployeeView as select one.id, one.userid, two.name, two.phone, one.description from user_table one, (SELECT * FROM crosstab( 'SELECT user_ref,key,value FROM user_properties where identifier=''viewemployee'' order by 1,2') AS ct_row (user_ref int, name varchar, phone varchar)) two where one.id=two.user_ref

SQL查詢使用交叉爲managerview：

create MATERIALIZED VIEW ManagerView as select one.id, one.userid, two.email, one.description from user_table one, (SELECT * FROM crosstab( 'SELECT user_ref,key,value FROM user_properties where identifier=''viewmanager'' order by 1,2') AS ct_row (user_ref int, email varchar)) two where one.id=two.user_ref