将 MSSQL 查询转换为 MySQL 5.7.23

Question

我在 MSSQL 服务器上运行了一个复杂的 SQL 查询。我需要对其进行更改以使其也可以在 MySQL 数据库上运行，但是我不知道该怎么做。查询如下，用于在 BI 工具中构建复杂的 Sankey 图

    SELECT Id, Delivery_Date, Queue, Step1, Step2, Step3, Step4, Step5, Step6, Step7, 
CONVERT(DECIMAL(16,16),RAND((CHECKSUM(NEWID())))*(1 - 0.999999999)+0.999999999) as Counter
FROM
(SELECT t.ID as Id, t.DELIVERY_DATE as Delivery_Date, t.QUEUE as Queue, CONCAT(t.EVENT_NAME,' ', t.EVENT_STATUS, ' ',t .ENDING) as edsda,
'Step' + cast(row_number() over (partition by ID order by ID)
as varchar(10)) ColumnSeq

FROM (SELECT DISTINCT e.[ID] AS ID,
  e.[DIALOG_DELIVERY_DATE] AS DELIVERY_DATE,
  e.[QUEUE_ID] as QUEUE,
  s2.[STEP_NUMBER] AS STEP_NUMBER,
  s2.[CURRENT_EVENT] AS EVENT_NAME,
  s2.[EVENT_STATUS] as EVENT_STATUS,
  e.[DELIVERY_END] AS DELIVERY_END,
  CASE WHEN s2.[STEP_NUMBER] = max(s2.[STEP_NUMBER]) over (partition by s2.[ID]) 
and s2.[EVENT_NUMBER] = min(s2.[EVENT_NUMBER]) over (partition by s2.[ID], s2.[STEP_NUMBER]) THEN e.[DELIVERY_END] ELSE NULL END as ENDING
FROM [dbo].[DELIVERY_STEP_EVENTS] s1,
[dbo].[DELIVERY_STEP_EVENTS] s2,
[dbo].[DELIVERY_EVENTS] e
WHERE  s1.[ID] =  s2.[ID]
 AND e.[ID] = s2.[ID]
 AND s1.[EVENT_NAME] = s2.[EVENT_NAME]
 AND s1.[STEP_NUMBER] <= s2.[STEP_NUMBER] AS t) AS temp
pivot
(max(edsda)
for ColumnSeq in (Step1,Step2,Step3,Step4, Step5, Step6, Step7)
)
AS Piv

到目前为止，我最大的问题是我不知道如何更改为 MySQL 的 RAND((CHECKSUM(NEWID())))。

任何帮助将不胜感激。

Answer 1

到目前为止，我最大的问题是我的 RAND((CHECKSUM(NEWID()))) 不知道怎么改成MySQL。

RAND((CHECKSUM(NEWID()))) 的行为应该与 MySQL 中的 RAND() 函数相同。所以你可以简单地替换这个：

CONVERT(DECIMAL(16,16),RAND((CHECKSUM(NEWID())))*(1 - 0.999999999)+0.999999999)

有了这个：

CAST(RAND() * (1 - 0.999999999) + 0.999999999 AS DECIMAL(16, 16))

• SQL Server
• MySQL