/
ch10.sql
299 lines (285 loc) · 11.6 KB
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ch10.sql
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SELECT 'GETDATE()' AS [Function], GETDATE() AS [Value];
SELECT 'CURRENT_TIMESTAMP'AS [Function], CURRENT_TIMESTAMP AS [Value];
SELECT 'GETUTCDATE()' AS [Function], GETUTCDATE() AS [Value];
SELECT 'SYSDATETIME()' AS [Function], SYSDATETIME() AS [Value];
SELECT 'SYSUTCDATETIME()' AS [Function], SYSUTCDATETIME() AS [Value];
SELECT 'SYSDATETIMEOFFSET()' AS [Function], SYSDATETIMEOFFSET() AS [Value];
SELECT SWITCHOFFSET('2007-08-12T09:43:25-05:00', '+03:00');SELECT TODATETIMEOFFSET(GETDATE(), '-05:00') AS [Eastern Time Zone Time],
SYSDATETIMEOFFSET() [Current System Time];
SELECT DATEADD(YEAR, -1, '2009-04-02');SELECT TOP (5)
ProductID,
GETDATE() AS Today,
EndDate,
DATEDIFF(MONTH, EndDate, GETDATE()) AS ElapsedMonths
FROM Production.ProductCostHistory
WHERE EndDate IS NOT NULL;
WITH cteDates (StartDate, EndDate) AS
(
SELECT CONVERT(DATETIME2, '2010-12-31T23:59:59.9999999'),
CONVERT(DATETIME2, '2011-01-01T00:00:00.0000000')
)
SELECT StartDate,
EndDate,
DATEDIFF(YEAR, StartDate, EndDate) AS Years,
DATEDIFF(QUARTER, StartDate, EndDate) AS Quarters,
DATEDIFF(MONTH, StartDate, EndDate) AS Months,
DATEDIFF(DAY, StartDate, EndDate) AS Days,
DATEDIFF(HOUR, StartDate, EndDate) AS Hours,
DATEDIFF(MINUTE, StartDate, EndDate) AS Minutes,
DATEDIFF(SECOND, StartDate, EndDate) AS Seconds,
DATEDIFF(MILLISECOND, StartDate, EndDate) AS Milliseconds,
DATEDIFF(MICROSECOND, StartDate, EndDate) AS MicroSeconds
FROM cteDates;
DECLARE @StartDate DATETIME2 = '2012-01-01T18:25:42.9999999',
@EndDate DATETIME2 = '2012-06-15T13:12:11.8675309';
WITH cte AS
(
SELECT DATEDIFF(SECOND, @StartDate, @EndDate) AS ElapsedSeconds,
DATEDIFF(SECOND, @StartDate, @EndDate)/60 AS ElapsedMinutes,
DATEDIFF(SECOND, @StartDate, @EndDate)/3600 AS ElapsedHours,
DATEDIFF(SECOND, @StartDate, @EndDate)/86400 AS ElapsedDays
)
SELECT @StartDate AS StartDate,
@EndDate AS EndDate,
CONVERT(VARCHAR(10), ElapsedDays) + ':' +
CONVERT(VARCHAR(10), ElapsedHours%24) + ':' +
CONVERT(VARCHAR(10), ElapsedMinutes%60) + ':' +
CONVERT(VARCHAR(10), ElapsedSeconds%60) AS [ElapsedTime (D:H:M:S)]
FROM cte;SELECT TOP (5)
ProductID,
EndDate,
DATENAME(MONTH, EndDate) AS MonthName,
DATENAME(WEEKDAY, EndDate) AS WeekDayName
FROM Production.ProductCostHistory
WHERE EndDate IS NOT NULL;
SELECT TOP (5)
ProductID,
EndDate,
DATEPART(YEAR, EndDate) AS [Year],
DATEPART(MONTH, EndDate) AS [Month],
DATEPART(DAY, EndDate) AS [Day]
FROM Production.ProductCostHistory
WHERE EndDate IS NOT NULL;
SELECT MyData ,
ISDATE(MyData) AS IsADate
FROM (VALUES('IsThisADate'),
('2012-02-14'),
('2012-01-01T00:00:00'),
('2012-12-31T23:59:59.9999999')) dt(MyData);SELECT MyData,
EOMONTH(MyData) AS LastDayOfThisMonth,
EOMONTH(MyData, 1) AS LastDayOfNextMonth
FROM (VALUES ('2012-02-14T00:00:00' ),
('2012-01-01T00:00:00'),
('2012-12-31T23:59:59.9999999')) dt(MyData);--SELECT DATEFROMPARTS(2012, 8, 15) AS [Date],
-- TIMEFROMPARTS(18, 25, 32, 5, 1) AS [Time],
-- SMALLDATETIMEFROMPARTS(2012, 8, 15, 18, 25) AS [SmallDateTime],
-- DATETIMEFROMPARTS(2012, 8, 15, 18, 25, 32, 450) AS [DateTime];
--SELECT DATETIME2FROMPARTS(2012, 8, 15, 18, 25, 32, 5, 7) AS [DateTime2],
-- DATETIMEOFFSETFROMPARTS(2012, 8, 15, 18, 25, 32, 5, 4, 0, 7) AS [DateTimeOffset];
SELECT 'DateFromParts' AS ConversionType,
DATEFROMPARTS(2012, 8, 15) AS [Value];
SELECT 'TimeFromParts' AS ConversionType,
TIMEFROMPARTS(18, 25, 32, 5, 1) AS [Value];
SELECT 'SmallDateTimeFromParts' AS ConversionType,
SMALLDATETIMEFROMPARTS(2012, 8, 15, 18, 25) AS [Value];
SELECT 'DateTimeFromParts' AS ConversionType,
DATETIMEFROMPARTS(2012, 8, 15, 18, 25, 32, 450) AS [Value];
SELECT 'DateTime2FromParts' AS ConversionType,
DATETIME2FROMPARTS(2012, 8, 15, 18, 25, 32, 5, 7) AS [Value];
SELECT 'DateTimeOffsetFromParts' AS ConversionType,
DATETIMEOFFSETFROMPARTS(2012, 8, 15, 18, 25, 32, 5, 4, 0, 7) AS [Value];DECLARE @MyDate DATETIME2 = '2012-01-01T18:25:42.9999999',
@Base DATETIME = '1900-01-01T00:00:00',
@Base2 DATETIME = '2000-01-01T00:00:00';
-- Solution 1
SELECT MyDate,
DATEADD(YEAR, DATEDIFF(YEAR, @Base, MyDate), @Base) AS [FirstDayOfYear],
DATEADD(MONTH, DATEDIFF(MONTH, @Base, MyDate), @Base) AS [FirstDayOfMonth],
DATEADD(QUARTER,DATEDIFF(QUARTER, @Base, MyDate), @Base) AS [FirstDayOfQuarter]
FROM (VALUES ('1981-01-17T00:00:00'),
('1961-11-23T00:00:00'),
('1960-07-09T00:00:00'),
('1980-07-11T00:00:00'),
('1983-01-05T00:00:00'),
('2006-11-27T00:00:00')) dt (MyDate);
SELECT 'StartOfHour' AS ConversionType,
DATEADD(HOUR, DATEDIFF(HOUR, @Base, @MyDate), @Base) AS DateResult
UNION ALL
SELECT 'StartOfMinute',
DATEADD(MINUTE, DATEDIFF(MINUTE, @Base, @MyDate), @Base)
UNION ALL
SELECT 'StartOfSecond',
DATEADD(SECOND, DATEDIFF(SECOND, @Base2, @MyDate), @Base2);
-- Solution 2
SELECT MyDate,
DATETIMEFROMPARTS(ca.Yr, 1, 1, 0, 0, 0, 0) AS FirstDayOfYear,
DATETIMEFROMPARTS(ca.Yr, ca.Mn, 1, 0, 0, 0, 0) AS FirstDayOfMonth,
DATETIMEFROMPARTS(ca.Yr, ca.Qt, 1, 0, 0, 0, 0) AS FirstDayOfQuarter
FROM (VALUES ('1981-01-17T00:00:00'),
('1961-11-23T00:00:00'),
('1960-07-09T00:00:00'),
('1980-07-11T00:00:00'),
('1983-01-05T00:00:00'),
('2006-11-27T00:00:00')) dt (MyDate)
CROSS APPLY (SELECT DATEPART(YEAR, dt.MyDate) AS Yr,
DATEPART(MONTH, dt.MyDate) AS Mn,
((CEILING(MONTH(dt.MyDate)/3.0)*3)-2) AS Qt
) ca;
WITH cte AS
(
SELECT DATEPART(YEAR, @MyDate) AS Yr,
DATEPART(MONTH, @MyDate) AS Mth,
DATEPART(DAY, @MyDate) AS Dy,
DATEPART(HOUR, @MyDate) AS Hr,
DATEPART(MINUTE, @MyDate) AS Mn,
DATEPART(SECOND, @MyDate) AS Sec
)
SELECT 'StartOfHour' AS ConversionType,
DATETIMEFROMPARTS(cte.Yr, cte.Mth, cte.Dy, cte.Hr, 0, 0, 0) AS DateResult
FROM cte
UNION ALL
SELECT 'StartOfMinute',
DATETIMEFROMPARTS(cte.Yr, cte.Mth, cte.Dy, cte.Hr, cte.Mn, 0, 0)
FROM cte
UNION ALL
SELECT 'StartOfSecond',
DATETIMEFROMPARTS(cte.Yr, cte.Mth, cte.Dy, cte.Hr, cte.Mn, cte.Sec, 0)
FROM cte;
-- Solution 3
SELECT CONVERT(CHAR(10), ca.MyDate, 121) AS MyDate,
CAST(FORMAT(ca.MyDate, 'yyyy-01-01') AS DATETIME) AS FirstDayOfYear,
CAST(FORMAT(ca.MyDate, 'yyyy-MM-01') AS DATETIME) AS FirstDayOfMonth
FROM (VALUES ('1981-01-17T00:00:00'),
('1961-11-23T00:00:00'),
('1960-07-09T00:00:00'),
('1980-07-11T00:00:00'),
('1983-01-05T00:00:00'),
('2006-11-27T00:00:00')) dt (MyDate)
CROSS APPLY (SELECT CAST(dt.MyDate AS DATE)) AS ca(MyDate);
SELECT 'StartOfHour' AS ConversionType,
FORMAT(@MyDate, 'yyyy-MM-dd HH:00:00.000') AS DateResult
UNION ALL
SELECT 'StartOfMinute',
FORMAT(@MyDate, 'yyyy-MM-dd HH:mm:00.000')
UNION ALL
SELECT 'StartOfSecond',
FORMAT(@MyDate, 'yyyy-MM-dd HH:mm:ss.000');
DECLARE @Base DATETIME = '1900-01-01T00:00:00';
WITH cteExpenses AS
(
SELECT ca.FirstOfMonth,
SUM(ExpenseAmount) AS MonthlyExpenses
FROM ( VALUES ('2012-01-15T00:00:00', 1250.00),
('2012-01-28T00:00:00', 750.00),
('2012-03-01T00:00:00', 1475.00),
('2012-03-23T00:00:00', 2285.00),
('2012-04-01T00:00:00', 1650.00),
('2012-04-22T00:00:00', 1452.00),
('2012-06-15T00:00:00', 1875.00),
('2012-07-23T00:00:00', 2125.00) ) dt (ExpenseDate, ExpenseAmount)
CROSS APPLY (SELECT DATEADD(MONTH, DATEDIFF(MONTH, @Base, ExpenseDate), @Base) ) ca (FirstOfMonth)
GROUP BY ca.FirstOfMonth
), cteMonths AS
(
SELECT DATEFROMPARTS(2012, M, 1) AS FirstOfMonth
FROM ( VALUES (1), (2), (3), (4),
(5), (6), (7), (8),
(9), (10), (11), (12) ) Months (M)
)
SELECT CAST(FirstOfMonth AS DATE) AS FirstOfMonth,
MonthlyExpenses
FROM cteExpenses
UNION ALL
SELECT m.FirstOfMonth,
0
FROM cteMonths M
LEFT JOIN cteExpenses e
ON M.FirstOfMonth = e.FirstOfMonth
WHERE e.FirstOfMonth IS NULL
ORDER BY FirstOfMonth;USE Sandbox
GO
IF OBJECT_ID('dbo.Calendar','U') IS NOT NULL DROP TABLE dbo.Calendar;
GO
CREATE TABLE dbo.Calendar (
[Date] DATE CONSTRAINT PK_Calendar PRIMARY KEY CLUSTERED,
FirstDayOfYear DATE,
LastDayOfYear DATE,
FirstDayOfMonth DATE,
LastDayOfMonth DATE,
FirstDayOfWeek DATE,
LastDayOfWeek DATE,
DayOfWeekName NVARCHAR(20),
IsWeekDay BIT,
IsWeekEnd BIT);
GO
DECLARE @Base DATETIME = '1900-01-01T00:00:00',
@Start DATETIME = '2000-01-01T00:00:00'
INSERT INTO dbo.Calendar
SELECT TOP 9497
ca.Date,
cy.FirstDayOfYear,
cyl.LastDayOfYear,
cm.FirstDayOfMonth,
cml.LastDayOfMonth,
cw.FirstDayOfWeek,
cwl.LastDayOfWeek,
cd.DayOfWeekName,
cwd.IsWeekDay,
CAST(cwd.IsWeekDay - 1 AS BIT) AS IsWeekEnd
FROM (SELECT ROW_NUMBER() OVER (ORDER BY (SELECT 0))
FROM sys.all_columns t1
CROSS JOIN sys.all_columns t2) dt (RN)
CROSS APPLY (SELECT DATEADD(DAY, RN-1, @Start)) AS ca(Date)
CROSS APPLY (SELECT DATEADD(YEAR, DATEDIFF(YEAR, @Base, ca.Date), @Base)) AS cy(FirstDayOfYear)
CROSS APPLY (SELECT DATEADD(DAY, -1, DATEADD(YEAR, 1, cy.FirstDayOfYear))) AS cyl(LastDayOfYear)
CROSS APPLY (SELECT DATEADD(MONTH, DATEDIFF(MONTH, @Base, ca.Date), @Base)) AS cm(FirstDayOfMonth)
CROSS APPLY (SELECT DATEADD(DAY, -1, DATEADD(MONTH, 1, cm.FirstDayOfMonth))) AS cml(LastDayOfMonth)
CROSS APPLY (SELECT DATEADD(DAY,-(DATEPART(weekday ,ca.Date)-1),ca.Date)) AS cw(FirstDayOfWeek)
CROSS APPLY (SELECT DATEADD(DAY, 6, cw.FirstDayOfWeek)) AS cwl(LastDayOfWeek)
CROSS APPLY (SELECT DATENAME(weekday, ca.Date)) AS cd(DayOfWeekName)
CROSS APPLY (SELECT CASE WHEN cd.DayOfWeekName IN ('Monday', 'Tuesday', 'Wednesday',
'Thursday', 'Friday')
THEN 1
ELSE 0
END) AS cwd(IsWeekDay);
GO
WITH cte AS
(
SELECT FirstDayOfMonth,
Date,
RN = ROW_NUMBER() OVER (PARTITION BY FirstDayOfMonth ORDER BY Date)
FROM dbo.Calendar
WHERE DayOfWeekName = 'Thursday'
)
SELECT Date
FROM cte
WHERE RN = 3
AND FirstDayOfMonth = '2012-11-01T00:00:00';
SELECT c1.Date
FROM dbo.Calendar c1 -- prior week
JOIN dbo.Calendar c2 -- current week
ON c1.FirstDayOfWeek = DATEADD(DAY, -7, c2.FirstDayOfWeek)
WHERE c1.DayOfWeekName = 'Friday'
AND c2.Date = CAST(GETDATE() AS DATE);
WITH cte AS
(
SELECT edh.BusinessEntityID,
c.FirstDayOfMonth
FROM AdventureWorks2012.HumanResources.EmployeeDepartmentHistory AS edh
JOIN dbo.Calendar AS c
ON c.Date BETWEEN edh.StartDate
AND ISNULL(edh.EndDate, GETDATE())
GROUP BY edh.BusinessEntityID,
c.FirstDayOfMonth
)
SELECT FirstDayOfMonth,
COUNT(*) AS EmployeeQty
FROM cte
GROUP BY FirstDayOfMonth
ORDER BY FirstDayOfMonth;SELECT 'sysdatetime' AS ConversionType, 126 AS Style,
CONVERT(varchar(30), SYSDATETIME(), 126) AS [Value] UNION ALL
SELECT 'sysdatetime', 127,
CONVERT(varchar(30), SYSDATETIME(), 127) UNION ALL
SELECT 'getdate', 126,
CONVERT(varchar(30), GETDATE(), 126) UNION ALL
SELECT 'getdate', 127,
CONVERT(varchar(30), GETDATE(), 127);