Returns the day in which a date value falls. This function is an additional function of MaxCompute V2.0.
Syntax
int day(datetime|timestamp|date|string <date>)Parameters
date: required. A date value of the DATETIME, TIMESTAMP, DATE, or STRING type. The input value is in the yyyy-mm-dd, yyyy-mm-dd hh:mi:ss, or yyyy-mm-dd hh:mi:ss.ff3 format. If the value is of the STRING type, the value must include at least the yyyy-mm-dd part and must not contain extra strings.
Return value
A value of the INT type is returned. The return value varies based on the following rules:
If the value of date is not of the DATETIME, TIMESTAMP, DATE, or STRING type or the format does not meet the requirements, the return value is null.
If the value of date is null, the return value is null.
Sample data
This section provides sample source data for you to understand how to use date functions. In this topic, a table named mf_date_fun_t is created and data is inserted into the table. Sample statements:
create table if not exists mf_date_fun_t(
id int,
date1 date,
datetime1 datetime,
timestamp1 timestamp,
date2 date,
datetime2 datetime,
timestamp2 timestamp,
date3 string,
date4 bigint);
insert into mf_date_fun_t values
(1,DATE'2021-11-29',DATETIME'2021-11-29 00:01:00',TIMESTAMP'2021-01-11 00:00:00.123456789',DATE'2021-10-29',DATETIME'2021-10-29 00:00:00',TIMESTAMP'2021-10-11 00:00:00.123456789','2021-11-20',123456780),
(2,DATE'2021-11-28',DATETIME'2021-11-28 00:02:00',TIMESTAMP'2021-02-11 00:00:00.123456789',DATE'2021-10-29',DATETIME'2021-10-29 00:00:00',TIMESTAMP'2021-10-11 00:00:00.123456789','2021-11-21',123456781),
(3,DATE'2021-11-27',DATETIME'2021-11-27 00:03:00',TIMESTAMP'2021-03-11 00:00:00.123456789',DATE'2021-10-29',DATETIME'2021-10-29 00:00:00',TIMESTAMP'2021-10-11 00:00:00.123456789','2021-11-22',123456782),
(4,DATE'2021-11-26',DATETIME'2021-11-26 00:04:00',TIMESTAMP'2021-04-11 00:00:00.123456789',DATE'2021-10-29',DATETIME'2021-10-29 00:00:00',TIMESTAMP'2021-10-11 00:00:00.123456789','2021-11-23',123456783),
(5,DATE'2021-11-25',DATETIME'2021-11-25 00:05:00',TIMESTAMP'2021-05-11 00:00:00.123456789',DATE'2021-10-29',DATETIME'2021-10-29 00:00:00',TIMESTAMP'2021-10-11 00:00:00.123456789','2021-11-24',123456784),
(6,DATE'2021-11-24',DATETIME'2021-11-24 00:06:00',TIMESTAMP'2021-06-11 00:00:00.123456789',DATE'2021-10-29',DATETIME'2021-10-29 00:00:00',TIMESTAMP'2021-10-11 00:00:00.123456789','2021-11-25',123456785),
(7,DATE'2021-11-23',DATETIME'2021-11-23 00:07:00',TIMESTAMP'2021-07-11 00:00:00.123456789',DATE'2021-10-29',DATETIME'2021-10-29 00:00:00',TIMESTAMP'2021-10-11 00:00:00.123456789','2021-11-26',123456786),
(8,DATE'2021-11-22',DATETIME'2021-11-22 00:08:00',TIMESTAMP'2021-08-11 00:00:00.123456789',DATE'2021-10-29',DATETIME'2021-10-29 00:00:00',TIMESTAMP'2021-10-11 00:00:00.123456789','2021-11-27',123456787),
(9,DATE'2021-11-21',DATETIME'2021-11-21 00:09:00',TIMESTAMP'2021-09-11 00:00:00.123456789',DATE'2021-10-29',DATETIME'2021-10-29 00:00:00',TIMESTAMP'2021-10-11 00:00:00.123456789','2021-11-28',123456788),
(10,DATE'2021-11-20',DATETIME'2021-11-20 00:10:00',TIMESTAMP'2021-10-11 00:00:00.123456789',DATE'2021-10-29',DATETIME'2021-10-29 00:00:00',TIMESTAMP'2021-10-11 00:00:00.123456789','2021-11-29',123456789);Query data from the mf_date_fun_t table. Sample statement:
select * from mf_date_fun_t;
-- The following result is returned:
+------+-------+------------+------------+-------+------------+------------+-------+------------+
| id | date1 | datetime1 | timestamp1 | date2 | datetime2 | timestamp2 | date3 | date4 |
+------+-------+------------+------------+-------+------------+------------+-------+------------+
| 1 | 2021-11-29 | 2021-11-29 00:01:00 | 2021-01-11 00:00:00.123456789 | 2021-10-29 | 2021-10-29 00:00:00 | 2021-10-11 00:00:00.123456789 | 2021-11-20 | 123456780 |
| 2 | 2021-11-28 | 2021-11-28 00:02:00 | 2021-02-11 00:00:00.123456789 | 2021-10-29 | 2021-10-29 00:00:00 | 2021-10-11 00:00:00.123456789 | 2021-11-21 | 123456781 |
| 3 | 2021-11-27 | 2021-11-27 00:03:00 | 2021-03-11 00:00:00.123456789 | 2021-10-29 | 2021-10-29 00:00:00 | 2021-10-11 00:00:00.123456789 | 2021-11-22 | 123456782 |
| 4 | 2021-11-26 | 2021-11-26 00:04:00 | 2021-04-11 00:00:00.123456789 | 2021-10-29 | 2021-10-29 00:00:00 | 2021-10-11 00:00:00.123456789 | 2021-11-23 | 123456783 |
| 5 | 2021-11-25 | 2021-11-25 00:05:00 | 2021-05-11 00:00:00.123456789 | 2021-10-29 | 2021-10-29 00:00:00 | 2021-10-11 00:00:00.123456789 | 2021-11-24 | 123456784 |
| 6 | 2021-11-24 | 2021-11-24 00:06:00 | 2021-06-11 00:00:00.123456789 | 2021-10-29 | 2021-10-29 00:00:00 | 2021-10-11 00:00:00.123456789 | 2021-11-25 | 123456785 |
| 7 | 2021-11-23 | 2021-11-23 00:07:00 | 2021-07-11 00:00:00.123456789 | 2021-10-29 | 2021-10-29 00:00:00 | 2021-10-11 00:00:00.123456789 | 2021-11-26 | 123456786 |
| 8 | 2021-11-22 | 2021-11-22 00:08:00 | 2021-08-11 00:00:00.123456789 | 2021-10-29 | 2021-10-29 00:00:00 | 2021-10-11 00:00:00.123456789 | 2021-11-27 | 123456787 |
| 9 | 2021-11-21 | 2021-11-21 00:09:00 | 2021-09-11 00:00:00.123456789 | 2021-10-29 | 2021-10-29 00:00:00 | 2021-10-11 00:00:00.123456789 | 2021-11-28 | 123456788 |
| 10 | 2021-11-20 | 2021-11-20 00:10:00 | 2021-10-11 00:00:00.123456789 | 2021-10-29 | 2021-10-29 00:00:00 | 2021-10-11 00:00:00.123456789 | 2021-11-29 | 123456789 |
+------+-------+------------+------------+-------+------------+------------+-------+------------+Examples: static data
-- The return value is 1.
select day('2014-09-01');
-- The return value is null.
select day('20140901');
-- The return value is null.
select day(null);Examples: table data
Obtain the day in which each date value in the date1, datetime1, timestamp1, and date3 columns falls. Data in Sample data is used in this example. Sample statements:
-- Enable the MaxCompute V2.0 data type edition. Commit the following SET statement along with the SQL statement.
set odps.sql.type.system.odps2=true;
select date1, day(date1) as date1_day, datetime1, day(datetime1) as datetime1_day, timestamp1, day(timestamp1) as timestamp1_day, date3, day(date3) as date3_day from mf_date_fun_t;The following result is returned:
+------------+-----------+---------------------+---------------+-------------------------------+----------------+------------+-----------+
| date1 | date1_day | datetime1 | datetime1_day | timestamp1 | timestamp1_day | date3 | date3_day |
+------------+-----------+---------------------+---------------+-------------------------------+----------------+------------+-----------+
| 2021-11-29 | 29 | 2021-11-29 00:01:00 | 29 | 2021-01-11 00:00:00.123456789 | 11 | 2021-11-20 | 20 |
| 2021-11-28 | 28 | 2021-11-28 00:02:00 | 28 | 2021-02-11 00:00:00.123456789 | 11 | 2021-11-21 | 21 |
| 2021-11-27 | 27 | 2021-11-27 00:03:00 | 27 | 2021-03-11 00:00:00.123456789 | 11 | 2021-11-22 | 22 |
| 2021-11-26 | 26 | 2021-11-26 00:04:00 | 26 | 2021-04-11 00:00:00.123456789 | 11 | 2021-11-23 | 23 |
| 2021-11-25 | 25 | 2021-11-25 00:05:00 | 25 | 2021-05-11 00:00:00.123456789 | 11 | 2021-11-24 | 24 |
| 2021-11-24 | 24 | 2021-11-24 00:06:00 | 24 | 2021-06-11 00:00:00.123456789 | 11 | 2021-11-25 | 25 |
| 2021-11-23 | 23 | 2021-11-23 00:07:00 | 23 | 2021-07-11 00:00:00.123456789 | 11 | 2021-11-26 | 26 |
| 2021-11-22 | 22 | 2021-11-22 00:08:00 | 22 | 2021-08-11 00:00:00.123456789 | 11 | 2021-11-27 | 27 |
| 2021-11-21 | 21 | 2021-11-21 00:09:00 | 21 | 2021-09-11 00:00:00.123456789 | 11 | 2021-11-28 | 28 |
| 2021-11-20 | 20 | 2021-11-20 00:10:00 | 20 | 2021-10-11 00:00:00.123456789 | 11 | 2021-11-29 | 29 |
+------------+-----------+---------------------+---------------+-------------------------------+----------------+------------+-----------+Related functions
DAY is a date function. For more information about functions related to date computing and conversion, see Date functions.