Проблема объединения таблиц в SQL Server с TIMESTAMP

Question

Я хочу взять данные текущего дня из трех таблиц в SQL-сервере.Я не могу присоединиться к столам с TIMESTAMP, TIMESTAMP отличается в каждой таблице.Нет единого фактора для объединения этих таблиц.Есть ли способ присоединиться к этим таблицам.Кроме того, я не могу изменить таблицы, полученные из сторонних сервисов.

Запросы:

SELECT * 
FROM table1 
WHERE CAST(TIMESTAMP AS DATE) = CAST(GETDATE() AS DATE) 
ORDER BY CAST(TIMESTAMP AS DATETIME2(0))

SELECT * 
FROM table2 
WHERE CAST(TIMESTAMP AS DATE) = CAST(GETDATE() AS DATE) 
ORDER BY CAST(TIMESTAMP AS DATETIME2(0))

SELECT * 
FROM table3
WHERE CAST(TIMESTAMP AS DATE) = CAST(GETDATE() AS DATE) 
ORDER BY CAST(TIMESTAMP AS DATETIME2(0))

SELECT 
    CAST(one.TIMESTAMP AS DATETIME2(0)) AS DATE,
    CONVERT(DECIMAL(10, 2), one.value) AS v1, 
    CONVERT(DECIMAL(10, 2), two.VALUE) AS v2, 
    CONVERT(DECIMAL(10, 2), three.VALUE) AS v3 
FROM
    table1 one 
LEFT JOIN 
    table2 two ON CAST(one.TIMESTAMP AS DATETIME2(0)) = CAST(two.TIMESTAMP AS DATETIME2(0)) 
LEFT JOIN 
    table3 three ON CAST(one.TIMESTAMP AS DATETIME2(0)) = CAST(three.TIMESTAMP AS DATETIME2(0))
WHERE
    CAST(one.TIMESTAMP AS DATE) = CAST(GETDATE() AS DATE) 
ORDER BY
    CAST(one.TIMESTAMP AS DATETIME2(0))

Результат:

Я не получил данные 2-й и 3-й таблиц.Например: 2018-12-30 00:00:15.657 на этот раз из первой строки третьей таблицы.Это не показывает в результате.Я хочу все данные.

Надеюсь, вы понимаете.Не могли бы вы помочь мне решить эту проблему.

Answer 1

Или просто измените ГДЕ

WHERE
    CAST(one.TIMESTAMP AS DATE) = CAST(GETDATE() AS DATE) 
 OR CAST(two.TIMESTAMP AS DATE) = CAST(GETDATE() AS DATE) 
 OR CAST(three.TIMESTAMP AS DATE) = CAST(GETDATE() AS DATE) 

Answer 2

Возможно, вы захотите, чтобы full join:

SELECT COALESCE(CAST(one.TIMESTAMP AS DATETIME2(0)),
                CAST(two.TIMESTAMP AS DATETIME2(0)),
                CAST(three.TIMESTAMP AS DATETIME2(0))
               ) as dt,
       CONVERT(DECIMAL(10, 2), one.value) AS v1, 
       CONVERT(DECIMAL(10, 2), two.VALUE) AS v2, 
       CONVERT(DECIMAL(10, 2), three.VALUE) AS v3 
FROM (SELECT *
      FROM table1 one
      WHERE CAST(one.TIMESTAMP AS DATE) = CAST(GETDATE() AS DATE)
     ) one FULL JOIN 
     (SELECT *
      FROM table2 two
      WHERE CAST(two.TIMESTAMP AS DATE) = CAST(GETDATE() AS DATE)
     ) two
     ON CAST(two.TIMESTAMP AS DATETIME2(0)) = CAST(on.TIMESTAMP AS DATETIME2(0)) FULL JOIN
     (SELECT *
      FROM table3 three
      WHERE CAST(three.TIMESTAMP AS DATE) = CAST(GETDATE() AS DATE)
     ) three
     ON CAST(three.TIMESTAMP AS DATETIME2(0)) = COALESCE(CAST(one.TIMESTAMP AS DATETIME2(0)), CAST(one.TIMESTAMP AS DATETIME2(0)))
ORDER BY dt;

FULL JOIN s были сложны с фильтрацией, поэтому здесь используются подзапросы.