SQL 连接从一个 T-SQL 查询返回结果，但不从另一个 T-SQL 查询返回结果

Question

我编写了两个 T-SQL 查询，它们使用 Databricks SQL 在 Databricks 上执行。

第一个查询返回144行结果：

返回 144 行

    SELECT DISTINCT
      PSTT.TransactionTypeID
    FROM basedrd.TransactionType PSTT
    LEFT OUTER JOIN basedrd.PMSTransaction ST
      ON PSTT.TransactionType = ST.TransactionType
    WHERE PSTT.TransactionSource = 'Pershing'
    OR (PSTT.TransactionSource = '')
    AND (ST.SEDOL = 'CASH'
          AND PSTT.IsCashTransaction = 1
          OR ST.SEDOL <> 'CASH'
          AND PSTT.IsCashTransaction = 0)

第二个查询不返回任何行

未返回任何行

SELECT DISTINCT
  PSTT.TransactionTypeID
FROM basedrd.PMSTransaction ST
LEFT OUTER JOIN basedrd.TransactionType PSTT
  ON PSTT.TransactionType = ST.TransactionType
    AND (PSTT.TransactionSource = 'Pershing'
      OR PSTT.TransactionSource = '')
    AND (ST.SEDOL = 'CASH'
      AND PSTT.IsCashTransaction = 1
      OR ST.SEDOL <> 'CASH'
      AND PSTT.IsCashTransaction = 0)

奇怪的是，如果我在 SQL Server 上执行相同的代码，我会在第一个查询中返回 145 行

返回 145 行

SELECT DISTINCT
  PSTT.TransactionTypeID
FROM dbo.TransactionType PSTT
LEFT OUTER JOIN dbo.PMSTransaction ST
  ON PSTT.TransactionType = ST.TransactionType
WHERE PSTT.TransactionSource = 'Pershing'
OR (PSTT.TransactionSource = '')
AND (ST.SEDOL = 'CASH'
      AND PSTT.IsCashTransaction = 1
      OR ST.SEDOL <> 'CASH'
      AND PSTT.IsCashTransaction = 0)

虽然我在 SQL Server 上的 Databricks 上的第二个查询没有返回任何行，但我返回了 46 行。

SELECT DISTINCT
  PSTT.TransactionTypeID
FROM dbo.PMSTransaction ST
LEFT OUTER JOIN dbo.TransactionType PSTT
  ON PSTT.TransactionType = ST.TransactionType
    AND (PSTT.TransactionSource = 'Pershing'
      OR PSTT.TransactionSource = '')
    AND (ST.SEDOL = 'CASH'
      AND PSTT.IsCashTransaction = 1
      OR ST.SEDOL <> 'CASH'
      AND PSTT.IsCashTransaction = 0)

在Databricks SQL和SQL Server上执行的查询之间的唯一区别是数据库名称（架构）SQL Server是dbo，而databricks是basedrd。

Answer 1

您的数据似乎不匹配。像这样的查询应该有助于确认这些值没有按预期排列：

with data as (
    select
        case when PSTT.TransactionSource = 'Pershing' then 'Pershing'
             when PSTT.TransactionSource = ''         then 'Blank'
             when ST.TransactionType is not null      then
                 case when PSTT.TransactionType is not null then 'Other' else 'Null' end
             else 'Unmatched Row' end as TransactionSource,
        case when ST.SEDOL = 'CASH' then 'Cash'
             when ST.SEDOL is null  then 'Null'
             else 'Other' end as SEDOL,
        case when PSTT.IsCashTransaction = 0     then '0'
             when PSTT.IsCashTransaction = 1     then '1'
             when PSTT.IsCashTransaction is null then 'Null'
             else 'Other' end
    from <SRC>.PMSTransaction ST left outer join <SRC>.TransactionType PSTT
        on PSTT.TransactionType = ST.TransactionType
)
select TransactionSource, SEDOL, IsCashTransaction, count(*)
from data
group by TransactionSource, SEDOL, IsCashTransaction
order by TransactionSource, SEDOL, IsCashTransaction;