Question

我有三个桌子

物料主数据：存储物料主数据详细信息

id integer NOT NULL DEFAULT, primary key
name character varying(255),
description character(255),
price double precision,
tax double precision,
readytosales character(1) DEFAULT 'N'::bpchar,
itemgroupid integer,
uom character varying(30),
quantity double precision DEFAULT 0,

购买：存储购买详细信息

purchaseid integer NOT NULL DEFAULT,
quantity double precision DEFAULT 0,
purchasemasterid integer NOT NULL,
itemid integer NOT NULL,
itemprice double precision DEFAULT 0.00,

销售：商店销售明细

salesid integer NOT NULL DEFAULT,
quantity double precision DEFAULT 0,
salesmasterid integer NOT NULL,
itemid integer,
itemprice double

用于获取库存摘要的公式为

itemmaster.quantity + purchase.quantity -sales.quantity

我使用以下查询获取详细信息，但无法获取结果

select im.id as itemid, 
       name as itemname,
       im.quantity as oepningquantity, 
       im.price as openingprice,
       (im.quantity * im.price) as openingbalance,
       p.quantity as purchasequantity, p.itemprice as purchaseprice,
       (p.quantity * p.itemprice)as totalpurchaseprice, 
       s.quantity as salesquanity, s.itemprice as saleprice,
       (s.quantity *s.itemprice)as totalsalesprice
from item_master as im 
  full outer join purchase as p on im.id=p.itemid 
  full outer join sales as s on im.id=s.itemid

Answer 1

例如，我们有3个表。表格1。表_2。 table_3。

和table_2和table_3由table_1的前键引用。因此，如果我们将这三个表连接在一起，查询将如下所示。

Select {table 1 Cols} {table 2 Cols} {table 3 Cols}
from table_1
join table_1.table_2ID = table_2.Id on (Specify Condition here)
join table_1.table_3ID = table_3.Id on (Specify Condition here)

Answer 2

您的查询有一个小问题。正确的查询是：

Number

_____ from item_master as im ______ -------此陈述有误。

String

Answer 3

这将起作用：

       select 
       im.id as itemid, 
       name as itemname,
       im.quantity as oepningquantity, 
       im.price as openingprice,
       (im.quantity * im.price) as openingbalance,
       p.quantity as purchasequantity,
       p.itemprice as purchaseprice,
       (p.quantity * p.itemprice)as totalpurchaseprice, 
       s.quantity as salesquanity, 
       s.itemprice as saleprice,
       (s.quantity *s.itemprice)as totalsalesprice
       from 
       Item master im,
       purchase p,
       sales s 
       where
       im.id=p.itemid and
       im.id=s.itemid;

如何在Postgres sql中联接3个表

3 个答案: