Question

我很难尝试创建一个包含SQL Server Management Studio 17中表的重复值的视图。

我的表格如下：

DATE = datetime 
Product = varchar(10)
Price = decimal(18,2)

Date     | Product | Price 

07-12-17 |    1    | 32

06-12-17 |    24   | 35

每天有1-24种产品。

我想创建以下视图表：

Date     | Product | Price 

07-12-17 |    1.1  | 32

07-12-17 |    1.2  | 32

07-12-17 |    1.3  | 32

07-12-17 |    1.4  | 32  

06-12-17 |    24.1 | 35 

06-12-17 |    24.2 | 35 

06-12-17 |    24.3 | 35 

06-12-17 |    24.4 | 35

每天所有24种产品都是如此。

Answer 1

尝试将CROSS JOIN与VALUES

一起使用

SELECT
  t.[Date],
  CONCAT(t.Product,'.',l.num) ProductLabel,
  t.Price
FROM [Your table] t
CROSS JOIN (VALUES(1),(2),(3),(4)) l(num)
ORDER BY t.[Date],t.Product,l.num

变体UNION ALL

SELECT
  t.[Date],
  t.Product+'.'+l.Label ProductLabel,
  t.Price
FROM [Your table] t
CROSS JOIN
  (
    SELECT '1' Label UNION ALL SELECT '2' UNION ALL SELECT '3' UNION ALL SELECT '4'
  ) l
ORDER BY t.[Date],t.Product,l.Label

如果您有另一个包含数字1-4的行的表，那么您可以对该表使用CROS JOIN

SELECT
  t.[Date],
  CONCAT(t.Product,'.',l.[ID from another table]) ProductLabel,
  t.Price
FROM [Your table] t
CROSS JOIN [Your table with numbers] l
ORDER BY t.[Date],t.Product,l.[ID from another table]

如果您只需要4个重复项，那么您还可以使用UNION ALL

的4个查询

SELECT [Date],Product+'.1' ProductLabel,Price FROM [Your table]
UNION ALL SELECT [Date],Product+'.2',Price FROM [Your table]
UNION ALL SELECT [Date],Product+'.3',Price FROM [Your table]
UNION ALL SELECT [Date],Product+'.4',Price FROM [Your table]
ORDER BY [Date],ProductLabel

SQL - 重复行（更改一列）

1 个答案: