子查询从查找中返回了超过 1 个值 table

Question

我的查询出现此错误。我查看了 table，其中存储了性别、婚姻状况和客户类型的值。但我想在 asp 中显示全部在 1 个网格视图中。如果数据库中只有 1 条记录，它是可行的，但是当我保存另一条记录时，错误 appears.Can 有人建议修复？

这是我的查询：

SELECT
  customer.customer_id
  ,customer.first_name
 ,customer.last_name
 ,customer.birth_date
 ,customer.phone
 ,customer.email
 ,customer.block
 ,customer.lot
 ,customer.status
 ,customer.is_deleted
 ,(SELECT 
 lookup_table.value
FROM dbo.lookup_description
INNER JOIN dbo.lookup_table
  ON lookup_description.desc_id = lookup_table.group_id
INNER JOIN dbo.customer ON customer.gender = lookup_table.lookup_id) AS Gender
 ,(SELECT 
 lookup_table.value
FROM dbo.lookup_description
INNER JOIN dbo.lookup_table
  ON lookup_description.desc_id = lookup_table.group_id
INNER JOIN dbo.customer ON customer.marital_status = lookup_table.lookup_id) AS MaritalStatus
 ,(SELECT 
 lookup_table.value
FROM dbo.lookup_description
INNER JOIN dbo.lookup_table
  ON lookup_description.desc_id = lookup_table.group_id
INNER JOIN dbo.customer ON customer.village = lookup_table.lookup_id) AS Village
 ,(SELECT 
 lookup_table.value
FROM dbo.lookup_description
INNER JOIN dbo.lookup_table
  ON lookup_description.desc_id = lookup_table.group_id
INNER JOIN dbo.customer ON customer.customer_type = lookup_table.lookup_id) AS CustomerType
FROM dbo.customer

提前致谢！

Answer 1

你有这个错误是有道理的。有一条记录一切都很好，但是你的子查询有更多的值和更多的记录，引擎不知道该选择什么。因为您根本没有过滤，所以您希望所有客户都具有他们的特征（性别，村庄......）我相信你应该做这样的事情：

SELECT
  customer.customer_id
  ,customer.first_name
 ,customer.last_name
 ,customer.birth_date
 ,customer.phone
 ,customer.email
 ,customer.block
 ,customer.lot
 ,customer.status
 ,customer.is_deleted
 ,Gender
 ,marital_status
 ,village
 ,customer_type

FROM dbo.customer a
inner join
 (SELECT 
 lookup_table.value as Gender, lookup_id
FROM dbo.lookup_description
INNER JOIN dbo.lookup_table
  ON lookup_description.desc_id = lookup_table.group_id
 ) AS Gender on  a.gender = Gender.lookup_id

inner join
 (SELECT 
 lookup_table.value as marital_status, lookup_id
FROM dbo.lookup_description
INNER JOIN dbo.lookup_table
  ON lookup_description.desc_id = lookup_table.group_id
 ) AS marital_status on  a.marital_status = marital_status.lookup_id

inner join
 (SELECT 
 lookup_table.value as village, lookup_id
FROM dbo.lookup_description
INNER JOIN dbo.lookup_table
  ON lookup_description.desc_id = lookup_table.group_id
 ) AS village on  a.village = village.lookup_id

inner join
 (SELECT 
 lookup_table.value as customer_type, lookup_id
FROM dbo.lookup_description
INNER JOIN dbo.lookup_table
  ON lookup_description.desc_id = lookup_table.group_id
 ) AS customer_type on  a.customer_type = customer_type.lookup_id

Answer 2

如@zip 所述，子查询 returns 多行并产生问题，您可以尝试这样的操作并应用过滤器来消除重复项

SELECT
  customer.customer_id
 ,customer.first_name
 ,customer.last_name
 ,customer.birth_date
 ,customer.phone
 ,customer.email
 ,customer.block
 ,customer.lot
 ,customer.status
 ,customer.is_deleted
 ,gender.value AS Gender
 ,MaritalStatus.value AS MaritalStatus
 ,Village.value AS Village
 ,CustomerType.value AS CustomerType
FROM dbo.customer
LEFT OUTER JOIN dbo.lookup_table gender          ON customer.gender = gender.lookup_id
LEFT OUTER JOIN dbo.lookup_table MaritalStatus   ON customer.marital_status = MaritalStatus.lookup_id
LEFT OUTER JOIN dbo.lookup_table Village         ON customer.village = Village.lookup_id
LEFT OUTER JOIN dbo.lookup_table CustomerType    ON customer.customer_type = CustomerType.lookup_id

Answer 3

我听从了 zip 的回答。他让客户 table 成为 'a'。用 'a' 替换了客户并删除了性别，marital_status，村庄，customer_type。

这里是查询：

SELECT
  a.customer_id
  ,a.first_name
 ,a.last_name
 ,a.birth_date
 ,a.phone
 ,a.email
 ,a.block
 ,a.lot
 ,a.status
 ,a.is_deleted

FROM dbo.customer a
inner join
 (SELECT 
 lookup_table.value as Gender, lookup_id
FROM dbo.lookup_description
INNER JOIN dbo.lookup_table
  ON lookup_description.desc_id = lookup_table.group_id
 ) AS Gender on  a.gender = Gender.lookup_id

inner join
 (SELECT 
 lookup_table.value as marital_status, lookup_id
FROM dbo.lookup_description
INNER JOIN dbo.lookup_table
  ON lookup_description.desc_id = lookup_table.group_id
 ) AS marital_status on  a.marital_status = marital_status.lookup_id

inner join
 (SELECT 
 lookup_table.value as village, lookup_id
FROM dbo.lookup_description
INNER JOIN dbo.lookup_table
  ON lookup_description.desc_id = lookup_table.group_id
 ) AS village on  a.village = village.lookup_id

inner join
 (SELECT 
 lookup_table.value as customer_type, lookup_id
FROM dbo.lookup_description
INNER JOIN dbo.lookup_table
  ON lookup_description.desc_id = lookup_table.group_id
 ) AS customer_type on  a.customer_type = customer_type.lookup_id

子查询从查找中返回了超过 1 个值 table

Subquery returned more than 1 value from look up table

sql

sql-server

sql-query-store