選擇查詢2008

Question

我有兩個表

create table tblchildinfo 
    (id int, name varchar(50), 
    pickuppointid int, dropdownpointid int) 

和

create table tblpoint(pointid int, PointName varchar(50)) 

所以我有主表tblpoint和子表作爲tblchildinfo，我想寫出這樣，我會發表聲明get child id，child name，pickuppointID，pickuppointName，dropdownpointId & dropdownpoint name

使用SQL Server

Answer 1

select c.id, c.name, p.name, p.pointid, p2.pointid, p2.name 
from tblchildinfo c 
join tblpoint p on c.pickuppointid = p.pointid 
join tblpoint p2 on c.dropdownpointid = p2.pointid 
where <Insert where clause> 

應該做你。

Answer 2

使用條件查詢了兩個表或使用LEFT JOIN上tblpoint。順便說一句，爲了便於閱讀，我建議使用unserscore來創建'多字詞'表，例如tbl_child_info和tbl_point。