DB2時間函式

2021-05-22 03:14:54 字數 3997 閱讀 3098

--

獲取當前日期:

select

current

date 

from

sysibm.sysdummy1; 

values

current

date;

--獲取當前日期 

select

current

time 

from

sysibm.sysdummy1; 

values

current

time; 

--獲取當前時間戳 

select

current

timestamp

from

sysibm.sysdummy1; 

values

current

timestamp

; --

要使當前時間或當前時間戳記調整到 gmt/cut,則把當前的時間或時間戳記減去當前時區暫存器:

values

current

time 

-current

timezone; 

values

current

timestamp

-current

timezone; 

--獲取當前年份

values

year

(current

timestamp

);--

獲取當前月 

values

month

(current

timestamp

);--

獲取當前日 

values

day(

current

timestamp

);--

獲取當前時 

values

hour(

current

timestamp

);--

獲取分鐘 

values

minute(

current

timestamp

);--

獲取秒 

values

second(

current

timestamp

);--

獲取毫秒 

values

microsecond(

current

timestamp

); --

從時間戳記單獨抽取出日期和時間

values

date(

current

timestamp

); values

varchar_format(

current

timestamp,'

yyyy-mm-dd

'); 

values

char

(current

date); 

values

time(

current

timestamp

); --

執行日期和時間的計算

values

current

date+1

year

;    

values

current

date+3

years+2

months +15

days; 

values

current

time +5

hours -3

minutes +10

seconds; 

--計算兩個日期之間的天數

values

days(

current

date)

-days(date(

'2010-02-20

')); 

--時間和日期換成字串

values

char

(current

date); 

values

char

(current

time); 

--要將字串轉換成日期或時間值

values

timestamp('

2010-03-09-22.43.00.000000

'); 

values

timestamp('

2010-03-09 22:44:36

'); 

values

date(

'2010-03-09

'); 

values

date(

'03/09/2010

'); 

values

time(

'22:45:27

'); 

values

time(

'22.45.27

'); 

--計算兩個時間戳記之間的時差:

--秒的小數部分為單位 

values

timestampdiff(1,

char

(current

timestamp

-timestamp('

2010-01-01-00.00.00

'))); 

--秒為單位 

values

timestampdiff(2,

char

(current

timestamp

-timestamp('

2010-01-01-00.00.00

'))); 

--分為單位 

values

timestampdiff(4,

char

(current

timestamp

-timestamp('

2010-01-01-00.00.00

'))); 

--小時為單位 

values

timestampdiff(8,

char

(current

timestamp

-timestamp('

2010-01-01-00.00.00

'))); 

--天為單位 

values

timestampdiff(16,

char

(current

timestamp

-timestamp('

2010-01-01-00.00.00

'))); 

--週為單位 

values

timestampdiff(32,

char

(current

timestamp

-timestamp('

2010-01-01-00.00.00

'))); 

--月為單位 

values

timestampdiff(64,

char

(current

timestamp

-timestamp('

2010-01-01-00.00.00

'))); 

--季度為單位 

values

timestampdiff(

128,

char

(current

timestamp

-timestamp('

2010-01-01-00.00.00

'))); 

--年為單位 

values

timestampdiff(

256,

char

(current

timestamp

-timestamp('

2010-01-01-00.00.00

')));

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