我如何联合内部联接

Question

我有三个单独的表，bs_products,td_products和fv_products。

SELECT 
bso.order_id, bso.order_num, bso.Salesman, bso.salesman_name, bso.date, bso.status, 

bsp.product_id, bsp.product_branch, bsp.product_name, bsp.description, bsp.vatable, bsp.critical_stock, 
bsp.quantity, bsp.sell_price, bsp.category_id, bsp.expiry_date, bsp.date, bsp.isEmpty, bsp.empties, 

bss.sws_id, bss.sws_proname, bss.sws_isEmpty, bss.sws_category, bss.sws_unitprice, bss.sws_prodesc, 
bss.sws_proexp, bss.sws_vat, bss.sws_number, bss.date, bss.sws_salesman, bss.sws_route, bss.sws_smname, 
bss.sws_driver, bss.sws_plate, bss.sws_vehicle, bss.sws_load, bss.sws_productid, bss.sws_quantity 
FROM bs_orders as bso INNER JOIN bs_products as bsp 
INNER JOIN bs_sws as bss WHERE status = 'Completed' 
AND bso.date = '11/30/2016' 
AND bso.order_num = bss.sws_number 
AND bss.sws_productid = bsp.product_id 

UNION 

SELECT 

tdo.order_id, tdo.order_num, tdo.Salesman, tdo.salesman_name, tdo.date, tdo.status, 

tdp.product_id, tdp.product_branch, tdp.product_name, tdp.description, tdp.vatable, tdp.critical_stock, 
tdp.quantity, tdp.sell_price, tdp.category_id, tdp.expiry_date, tdp.date, tdp.isEmpty, tdp.empties, 

tds.sws_id, tds.sws_proname, tds.sws_isEmpty, tds.sws_category, tds.sws_unitprice, tds.sws_prodesc, 
tds.sws_proexp, tds.sws_vat, tds.sws_number, tds.date, tds.sws_salesman, tds.sws_route, tds.sws_smname, 
tds.sws_driver, tds.sws_plate, tds.sws_vehicle, tds.sws_load, tds.sws_productid, tds.sws_quantity 

FROM td_orders as tdo INNER JOIN td_products as tdp 
INNER JOIN td_sws as tds WHERE status = 'Completed' 
AND tdo.date = '11/30/2016' 
AND tdo.order_num = tds.sws_number 
AND tds.sws_productid = tdp.product_id 

UNION 

SELECT 

fvo.order_id, fvo.order_num, fvo.Salesman, fvo.salesman_name, fvo.date, fvo.status, 

fvp.product_id, fvp.product_branch, fvp.product_name, fvp.description, fvp.vatable, fvp.critical_stock, 
fvp.quantity, fvp.sell_price, fvp.category_id, fvp.expiry_date, fvp.date, fvp.isEmpty, fvp.empties, 

fvs.sws_id, fvs.sws_proname, fvs.sws_isEmpty, fvs.sws_category, fvs.sws_unitprice, fvs.sws_prodesc, 
fvs.sws_proexp, fvs.sws_vat, fvs.sws_number, fvs.date, fvs.sws_salesman, fvs.sws_route, fvs.sws_smname, 
fvs.sws_driver, fvs.sws_plate, fvs.sws_vehicle, fvs.sws_load, fvs.sws_productid, fvs.sws_quantity 

FROM fv_orders as fvo INNER JOIN fv_products as fvp 
INNER JOIN fv_sws as fvs WHERE status = 'Completed' 
AND fvo.date = '11/30/2016' 
AND fvo.order_num = fvs.sws_number 
AND fvs.sws_productid = fvp.product_id 

我试图在phpMyAdmin的运行这一点，但它给我的

1221错误 - UNION不正确的用量和限制

，这是什么正确的查询？

_orders表

order_id (Primary) int(11)     
order_num   int(255)      
Salesman   varchar(255)      
salesman_name  varchar(255)      
date    varchar(255)     
status    varchar(255) 

_products表

product_id (Primary) int(11)     
product_branch   varchar(255)      
product_name   varchar(255)      
description    varchar(255)      
vatable     tinyint(1)     
critical_stock   int(11)    
quantity    int(11)     
sell_price    double     
category_id    int(11)     
expiry_date    varchar(255)      
date     varchar(255)      
isEmpty     tinyint(1)     
empties     int(11) 

_sws表

sws_id (Primary) int(11) No    
sws_proname    varchar(255)      
sws_isEmpty    tinyint(1)     
sws_category   int(11)     
sws_unitprice   double     
sws_prodesc    varchar(255)      
sws_proexp    varchar(255)      
sws_vat    tinyint(1)    
sws_number    int(255)     
date     varchar(255)      
sws_salesman   varchar(255)    
sws_route varchar(255)      
sws_smname varchar(255)      
sws_driver varchar(255)      
sws_plate varchar(255)     
sws_vehicle varchar(255)      
sws_load  int(255)     
sws_productid int(255)      
sws_quantity int(255)  

Answer 1

当使用UNION是在每个子查询的列数必须是相同的，并且它们必须具有相同的数据类型。

您需要调整您的查询，以便您不使用*，而是从每个表中定义每列。

详情参见以下内容：

• http://www.mysqltutorial.org/sql-union-mysql.aspx
• https://dev.mysql.com/doc/refman/5.7/en/union.html

有一些，你需要为了使用UNION运算符来遵守规则：

• 数量在相应的SELECT语句中出现的列必须相等。
• 列出现在每个SELECT语句的相应位置必须具有相同的数据类型或至少可转换的数据类型。

Answer 2

您需要重新考虑您的计划。

要进行联合，您需要具有相同名称和数据类型的字段。您不能简单地选择*并期望不同的表格在单个结果集中合并。

您可能需要更改名称或在选择的不同部分添加虚拟列以使其工作。

如果您发布表结构和字段名称，人们可能会帮助您更多。