SQL Server 2012（T-SQL）選擇日期到月份組

美好的一天，SQL Server 2012（T-SQL）選擇日期到月份組

我正在將每日數據彙總到月度數據。

TABLE daily_data: 
item_from, 
item_to, 
agg_day, 
average_day_rate, 
min_day_rate, 
max_day_rate, 
closing_day_rate 

TABLE monthly_data: 
item_from, 
item_to, 
agg_month, 
average_month_rate, 
min_month_rate, 
max_month_rate, 
closing_month_rate

選擇數據：

DECLARE @rundate  DATE; 
DECLARE @yesterday  DATE; 
DECLARE @firstofmonth DATE; 

SET @runday  = CONVERT(DATE, GETDATE()) 
SET @yesterday  = CONVERT(DATE, DATEADD(dd,-1,GETDATE())) 
SET @firstofmonth = DATEADD(dd, 1, EOMONTH(@yesterday, -1)) 

SELECT 
    item_from, 
    item_to, 
    DATEADD(dd, 1, EOMONTH(agg_day, -1))          agg_month, 
    SUM(average_day_rate)/COUNT(DISTINCT(agg_day))       average_month_rate, 
    MIN(min_day_rate)              min_month_rate, 
    MAX(max_day_rate)              max_month_rate, 
    (SELECT closing_day_rate FROM daily_data WHERE agg_day = MAX(agg_day)) closing_month_rate 
FROM 
    daily_data 
WHERE 
    agg_day >= @firstofmonth 
    and agg_day < @runday 
GROUP BY 
    item_from, 
    item_to, 
    DATEADD(dd, 1, EOMONTH(agg_day, -1))

結果：聚合不應出現在WHERE子句中，除非它是在含有HAVING子句或選擇列表在子查詢中，並且列被聚集的是外部參考。

我嘗試過在組中使用agg-day，改變了在哪裏有一個，但沒有任何成功。在PL-SQL中，我將使用

SELECT 
    item_from, 
    item_to, 
    trunc(agg_day, MONTH)             agg_month, 
    SUM(average_day_rate)/COUNT(DISTINCT(agg_day))       average_month_rate, 
    MIN(min_day_rate)              min_month_rate, 
    MAX(max_day_rate)              max_month_rate, 
    (SELECT closing_day_rate FROM daily_data WHERE agg_day = MAX(agg_day)) closing_month_rate 
FROM 
    daily_data 
WHERE 
    agg_day >= @firstofmonth 
    and agg_day < @runday 
GROUP BY 
    item_from, 
    item_to, 
    trunc(agg_day, MONTH)

請幫助。

來源

2016-11-30 Andre du Plessis

你爲什麼不把SELECT closing_day_rate FROM daily_data WHERE agg_day = MAX（agg_day）成CTE - 甚至更好：結果直接到一個變量？ – Tyron78

SOLUTION：

DECLARE @rundate  DATE; 
DECLARE @yesterday  DATE; 
DECLARE @firstofmonth DATE; 
DECLARE @lastdayclosing SMALLMONEY; 

SET @runday  = CONVERT(DATE, GETDATE()) 
SET @yesterday  = CONVERT(DATE, DATEADD(dd,-1,GETDATE())) 
SET @firstofmonth = DATEADD(dd, 1, EOMONTH(@yesterday, -1)) 
SET @lastdayclosing = (SELECT close_rate FROM exchange_rate_daily WHERE exr_date = @yesterday) 

SELECT 
    item_from, 
    item_to, 
    @firstofmonth         agg_month, 
    SUM(average_day_rate)/COUNT(DISTINCT(agg_day)) average_month_rate, 
    MIN(min_day_rate)        min_month_rate, 
    MAX(max_day_rate)        max_month_rate, 
    @lstdayclosing         closing_month_rate 
FROM 
    daily_data 
WHERE 
    agg_day >= @firstofmonth 
    and agg_day < @runday 
GROUP BY 
    item_from, 
    item_to 
;

來源

2016-11-30 09:15:49

SQL Server 2012（T-SQL）選擇日期到月份組

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