where DATEDIFF(WEEK, pubdate, GETDATE()) <= 48 : DATEPART « Date Functions « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Date Functions » DATEPART 
10.8.5.where DATEDIFF(WEEK, pubdate, GETDATE()) <= 48
3CREATE TABLE titles(
4>    title_id       varchar(20),
5>    title          varchar(80)       NOT NULL,
6>    type           char(12)          NOT NULL,
7>    pub_id         char(4)               NULL,
8>    price          money                 NULL,
9>    advance        money                 NULL,
10>    royalty        int                   NULL,
11>    ytd_sales      int                   NULL,
12>    notes          varchar(200)          NULL,
13>    pubdate        datetime          NOT NULL
14)
15> GO
1>
2insert titles values ('1''Secrets',   'popular_comp', '1389', $20.00, $8000.00, 104095,'Note 1','06/12/94')
3insert titles values ('2''The',       'business',     '1389', $19.99, $5000.00, 104095,'Note 2','06/12/91')
4insert titles values ('3''Emotional', 'psychology',   '0736', $7.99,  $4000.00, 103336,'Note 3','06/12/91')
5insert titles values ('4''Prolonged', 'psychology',   '0736', $19.99, $2000.00, 104072,'Note 4','06/12/91')
6insert titles values ('5''With',      'business',     '1389', $11.95, $5000.00, 103876,'Note 5','06/09/91')
7insert titles values ('6''Valley',    'mod_cook',     '0877', $19.99, $0.00,    122032,'Note 6','06/09/91')
8insert titles values ('7''Any?',      'trad_cook',    '0877', $14.99, $8000.00, 104095,'Note 7','06/12/91')
9insert titles values ('8''Fifty',     'trad_cook',    '0877', $11.95, $4000.00, 141509,'Note 8','06/12/91')
10> GO

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)
1>
2>
3select from titles
4where DATEDIFF(WEEK, pubdate, GETDATE()) <= 48
5> GO
title_id             title                                                                            type         pub_id price                 advance               royalty     ytd_sales   notes
                                                                                                                                                                                               pubdate

-------------------- -------------------------------------------------------------------------------- ------------ ------ --------------------- --------------------- ----------- ----------- ----------
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ---------
--------------

(rows affected)
1>
2> drop table titles;
3> GO
10.8.DATEPART
10.8.1.DATEPART returns part of a date as an integer value.
10.8.2.Values for the datepart parameter.
10.8.3.WHERE DATEPART(WEEKDAY, pubdate) = 3
10.8.4.where DATEPART(DAY, pubdate) BETWEEN 8 AND 14
10.8.5.where DATEDIFF(WEEK, pubdate, GETDATE()) <= 48
10.8.6.DATEPART Function returns the integer value of the datepart specified: DATEPART(datepart,date)
10.8.7.select DATEPART(day, '2002-09-30 11:35:00')
10.8.8.select DATEPART(month, '2002-09-30 11:35:00')
10.8.9.select DATEPART(year, '2002-09-30 11:35:00')
10.8.10.select DATEPART(hour, '2002-09-30 11:35:00')
10.8.11.select DATEPART(minute, '2002-09-30 11:35:00')
10.8.12.select DATEPART(second, '2002-09-30 11:35:00')
10.8.13.select DATEPART(quarter, '2002-09-30 11:35:00')
10.8.14.select DATEPART(dayofyear, '2002-09-30 11:35:00')
10.8.15.select DATEPART(week, '2002-09-30 11:35:00')
10.8.16.select DATEPART(weekday, '2002-09-30 11:35:00')
10.8.17.select DATEPART(m,'2002-09-30')
10.8.18.SELECT DATEPART(dd, '7/5/99')
10.8.19.SELECT DATEPART(dd, '7/5/00')
10.8.20.IF DATEDIFF(dd, '7/5/99','7/5/00') = 0
10.8.21.(DATEPART(mm, @date1) = DATEPART(mm, @date2))
10.8.22.(DATEPART(dd, @date1) = DATEPART(dd, @date2))
10.8.23.(DATEPART(yy, @date1) = DATEPART(yy, @date2)
10.8.24.Identifying Weekday
10.8.25.Grouping by the Week by using datepart function
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