Zeitstempeldatenatyp in SQL
timestamp: Stores a unique number that gets updated every time a row gets created
or modified.
Tiny Coders
timestamp: Stores a unique number that gets updated every time a row gets created
or modified. SELECT GETDATE() -- 2017-07-28 21:34:55.830
SELECT GETUTCDATE() -- 2017-07-28 18:34:55.830
SELECT SYSDATETIME() -- 2017-07-28 21:02:22.7446744
SELECT SYSUTCDATETIME() -- 2017-07-28 18:20:27.5202777
SELECT SYSDATETIMEOFFSET() -- 2017-07-28 21:02:22.7446744 +03:00
SELECT DAY(GETDATE()) -- 28
SELECT MONTH(GETDATE()) -- 7
SELECT YEAR(GETDATE()) -- 2017
SELECT DATENAME(month, GETDATE()) -- July
SELECT DATEADD(month, 2, '2017-7-28') -- 2017-09-28 00:00:00.000
SELECT DATEADD(day, 5, '2017-7-28') -- 2017-08-02 00:00:00.000
SELECT DATEADD(day, -5, '2017-7-28') -- 2017-07-23 00:00:00.000
SELECT DATEDIFF(year, '2017-7-28', '2018-9-28') -- разница 1 год
SELECT DATEDIFF(month, '2017-7-28', '2018-9-28') -- разница 14 месяцев
SELECT DATEDIFF(day, '2017-7-28', '2018-9-28') -- разница 427 дней
SELECT TODATETIMEOFFSET('2017-7-28 01:10:22', '+03:00')
SELECT SWITCHOFFSET(SYSDATETIMEOFFSET(), '+02:30')
SELECT EOMONTH('2017-02-05') -- 2017-02-28
SELECT EOMONTH('2017-02-05', 3) -- 2017-05-31
SELECT DATEFROMPARTS(2017, 7, 28) -- 2017-07-28
SELECT ISDATE('2017-07-28') -- 1
SELECT ISDATE('2017-28-07') -- 0
SELECT ISDATE('28-07-2017') -- 0
SELECT ISDATE('SQL') -- 0
--Example:
CREATE TABLE Orders
(
Id INT IDENTITY PRIMARY KEY,
ProductId INT NOT NULL,
CustomerId INT NOT NULL,
CreatedAt DATE NOT NULL DEFAULT GETDATE(),
ProductCount INT DEFAULT 1,
Price MONEY NOT NULL
);
SELECT * FROM Orders
WHERE DATEDIFF(day, CreatedAt, GETDATE()) = 16