Простое обновление запроса на случай, когда

Question

У меня есть запрос, где много повторений одного условия. Я задаюсь вопросом - возможно ли поместить это условие в переменную или что-то в этом роде, чтобы не все предложения повторялись каждый раз?

Часть, которая повторяется:

ISNULL((CASE WHEN IS_HOLIDAY = 1 THEN 2.5 * NETO_HOUR
     WHEN DAY_IN_WEEK = 'Sunday' THEN NETO_HOUR END),0)

В запрос выглядит так:

UPDATE @tblALL_HOURS SET REG_WORK_COST = (CASE WHEN MINUTE_FROM >= 0 AND MINUTE_FROM <= @6h AND MINUTE_TO >= @6h AND MINUTE_TO <= @18h
AND IS_ABSENT = 0
THEN (DATEDIFF(MINUTE, DATEADD(MINUTE, @6h, CAST(CAST(DATE_TO AS DATE) AS DATETIME)), date_to)/60.00) * (BRUTO_HOUR + ISNULL((CASE WHEN IS_HOLIDAY = 1 THEN 2.5 * NETO_HOUR WHEN DAY_IN_WEEK = 'Sunday' THEN NETO_HOUR END),0))

WHEN MINUTE_FROM >= 0 AND MINUTE_FROM <= @6h AND MINUTE_TO >= @18h AND MINUTE_TO < @24h
AND IS_ABSENT = 0
THEN 12.00 * (BRUTO_HOUR + ISNULL((CASE WHEN IS_HOLIDAY = 1 THEN 2.5 * NETO_HOUR WHEN DAY_IN_WEEK = 'Sunday' THEN NETO_HOUR END),0))

WHEN MINUTE_FROM >= @6h AND MINUTE_FROM <= @18h AND MINUTE_TO >= @6h AND MINUTE_TO <= @18h
AND IS_ABSENT = 0
THEN (DATEDIFF(MINUTE, DATE_FROM, DATE_TO) / 60.00) * (BRUTO_HOUR + ISNULL((CASE WHEN IS_HOLIDAY = 1 THEN 2.5 * NETO_HOUR WHEN DAY_IN_WEEK = 'Sunday' THEN NETO_HOUR END),0))

WHEN MINUTE_FROM >= @6h AND MINUTE_FROM <= @18h AND MINUTE_TO >= @18h AND MINUTE_TO < @24h
AND IS_ABSENT = 0
THEN (DATEDIFF(MINUTE, DATE_FROM, DATEADD(MINUTE, @18h, CAST(CAST(DATE_FROM AS DATE) AS DATETIME))) / 60.00) * (BRUTO_HOUR + ISNULL((CASE WHEN IS_HOLIDAY = 1 THEN 2.5 * NETO_HOUR WHEN DAY_IN_WEEK = 'Sunday' THEN NETO_HOUR END),0))

END)

Возможно ли иметь что-то вроде этого:

WHEN MINUTE_FROM >= @6h AND MINUTE_FROM <= @18h AND MINUTE_TO >= @18h AND MINUTE_TO < @24h AND IS_ABSENT = 0 THEN (DATEDIFF(MINUTE, DATE_FROM, DATEADD(MINUTE, @18h, CAST(CAST(DATE_FROM AS DATE) AS DATETIME))) / 60.00) * (BRUTO_HOUR + @myCondition)

Answer 1

Используйте простой CTE, который возвращает все столбцы @tblALL_HOURS и значение, возвращаемое функцией ISNULL:

ISNULL(CASE WHEN IS_HOLIDAY = 1 THEN 2.5 * NETO_HOUR WHEN DAY_IN_WEEK = 'Sunday' THEN NETO_HOUR END,0)

в качестве столбца, а затем обновите его с помощью CTE и используйте этот столбец вместо условия:

WITH cte AS (
  SELECT *, 
    ISNULL(CASE WHEN IS_HOLIDAY = 1 THEN 2.5 * NETO_HOUR WHEN DAY_IN_WEEK = 'Sunday' THEN NETO_HOUR END,0) AS myCondition 
  FROM @tblALL_HOURS 
)
UPDATE cte 
SET REG_WORK_COST = CASE 
    WHEN MINUTE_FROM >= 0 AND MINUTE_FROM <= @6h AND MINUTE_TO >= @6h AND MINUTE_TO <= @18h AND IS_ABSENT = 0
      THEN (DATEDIFF(MINUTE, DATEADD(MINUTE, @6h, CAST(CAST(DATE_TO AS DATE) AS DATETIME)), date_to)/60.00) * (BRUTO_HOUR + myCondition)
    WHEN MINUTE_FROM >= 0 AND MINUTE_FROM <= @6h AND MINUTE_TO >= @18h AND MINUTE_TO < @24h AND IS_ABSENT = 0
      THEN 12.00 * (BRUTO_HOUR + myCondition)
    WHEN MINUTE_FROM >= @6h AND MINUTE_FROM <= @18h AND MINUTE_TO >= @6h AND MINUTE_TO <= @18h AND IS_ABSENT = 0
      THEN (DATEDIFF(MINUTE, DATE_FROM, DATE_TO) / 60.00) * (BRUTO_HOUR + myCondition)
    WHEN MINUTE_FROM >= @6h AND MINUTE_FROM <= @18h AND MINUTE_TO >= @18h AND MINUTE_TO < @24h AND IS_ABSENT = 0
      THEN (DATEDIFF(MINUTE, DATE_FROM, DATEADD(MINUTE, @18h, CAST(CAST(DATE_FROM AS DATE) AS DATETIME))) / 60.00) * (BRUTO_HOUR + myCondition)
END