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
我试过在phpMyAdmin上运行它，但它给了我一个错误
1221 - UNION和LIMIT的使用不正确
对此有什么正确的查询？
_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)
答案 0 :(得分：0)
使用UNION时，每个子查询中的列数必须相同，并且它们必须具有相同的数据类型。
您需要调整查询，以便不使用*，而是定义每个表中的每一列。
有关详细信息，请参阅以下内容：
为了使用UNION运算符，您需要遵循一些规则：
- 相应的SELECT语句中出现的列数必须相等。
- 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，或者至少是可转换的数据类型。
答案 1 :(得分：0)
你需要重新考虑你的计划。
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*并期望在单个结果集中组合不同的表。
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正常工作。
如果您发布表格结构和字段名称，人们可能会为您提供更多帮助。