Question

我在编写查询时遇到问题。目前我可以检索每台机器运行百分比的每小时记录，并且我有一张表格，每天显示每台机器每小时记录的每个百分比。代码如下所示：

.......
WHERE     (tblCheckResult.DateTime >= @DateFrom) 
AND (tblCheckResult.DateTime <= DateTo) AND (tblCheck.CheckID = 69)
.......

CheckID是百分比的ID。我想要做的是显示平均每月录音和每年录音，例如1月80％，2月95％等。任何人都可以建议吗？

由于

Answer 1

您可以使用DatePart检索月份/年份部分和组。

像这样的东西

DECLARE @Table TABLE(
        DVal DATETIME,
        Val FLOAT
)


INSERT INTO @Table (DVal,Val) SELECT '01 Jan 2008', 10
INSERT INTO @Table (DVal,Val) SELECT '02 Jan 2008', 20
INSERT INTO @Table (DVal,Val) SELECT '03 Jan 2008', 30
INSERT INTO @Table (DVal,Val) SELECT '04 Jan 2008', 40
INSERT INTO @Table (DVal,Val) SELECT '05 Jan 2008', 50
INSERT INTO @Table (DVal,Val) SELECT '06 Jan 2008', 60

INSERT INTO @Table (DVal,Val) SELECT '01 Feb 2008', 11
INSERT INTO @Table (DVal,Val) SELECT '02 Feb 2008', 22
INSERT INTO @Table (DVal,Val) SELECT '03 Feb 2008', 33
INSERT INTO @Table (DVal,Val) SELECT '04 Feb 2008', 44
INSERT INTO @Table (DVal,Val) SELECT '05 Feb 2008', 55
INSERT INTO @Table (DVal,Val) SELECT '06 Feb 2008', 66


INSERT INTO @Table (DVal,Val) SELECT '01 Jan 2009', 16
INSERT INTO @Table (DVal,Val) SELECT '02 Jan 2009', 26
INSERT INTO @Table (DVal,Val) SELECT '03 Jan 2009', 36
INSERT INTO @Table (DVal,Val) SELECT '04 Jan 2009', 46
INSERT INTO @Table (DVal,Val) SELECT '05 Jan 2009', 56
INSERT INTO @Table (DVal,Val) SELECT '06 Jan 2009', 66

INSERT INTO @Table (DVal,Val) SELECT '01 Feb 2009', 17
INSERT INTO @Table (DVal,Val) SELECT '02 Feb 2009', 27
INSERT INTO @Table (DVal,Val) SELECT '03 Feb 2009', 37
INSERT INTO @Table (DVal,Val) SELECT '04 Feb 2009', 47
INSERT INTO @Table (DVal,Val) SELECT '05 Feb 2009', 57
INSERT INTO @Table (DVal,Val) SELECT '06 Feb 2009', 67


SELECT  DATEPART(yy, DVal) YearPart,
        DATEPART(MM, DVal) MonthPart,
        AVG(Val)
FROM    @Table
GROUP BY DATEPART(yy, DVal),
        DATEPART(MM, DVal)

SELECT  DATEPART(yy, DVal) YearPart,
        AVG(Val)
FROM    @Table
GROUP BY DATEPART(yy, DVal)

Answer 2

我认为您输入的SQL查询不正确。为了避免这个问题，你应该写

insert into table <table_name> select <value>;

如果您在执行查询时遇到问题，那么您应该在线检查SQL查询。如果问题仍然存在，那么SQL数据库可能会有损坏。

SQL Server中的查询问题

2 个答案: