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Database Articles
Page 316 of 547
What is the range of date time value that we can pass as an argument to MySQL UNIX_TIMESTAMP function?
The range of date time value that we can pass as an argument to MySQL UNIX_TIMESTAMP function is the same as the range of TIMESTAMP data type i.e. between ‘1970-01-01 00:00:01’ to ‘2038-01-19 08:44:07’. If we give the date time values in UNIX_TIMESTAMP function beyond or below TIMESTAMP range, MySQL will return 0 as output. It can be understood with the help of the following example −mysql> select UNIX_TIMESTAMP('2038-01-19 08:44:07'); +---------------------------------------+ | UNIX_TIMESTAMP('2038-01-19 08:44:07') | +---------------------------------------+ | 2147483647 | +---------------------------------------+ 1 row in set (0.00 sec) ...
Read MoreWhat MySQL returns if I write only one value in the enclosed set of unit values for compound INTERVAL unit?
In this case, MySQL will take into consideration right most unit given in compound INTERVAL unit. It will return the output after calculating the interval on the basis of single value provided in the enclosed set of unit values. The following example will clarify it −mysql> Select TIMESTAMP('2017-10-22 04:05:36' + INTERVAL '2 ' year_month) AS 'Only Month Value Changed'; +--------------------------+ | Only Month Value Changed | +--------------------------+ | 2017-12-22 04:05:36 | +--------------------------+ 1 row in set (0.00 sec)The query above changes the month (right most in compound INTERVAL unit) from 10 to 12 based on the single value ...
Read MoreWhat MySQL returns if I use enclosed set of unit values with INTERVAL keyword?
In this case, MySQL will take into consideration the first value out of two provided in the enclosed set of unit values. It will return the output along with warning after calculating the interval, based on the considered value from an enclosed set, on the unit given in INTERVAL keyword. The following example will clarify it −mysql> Select TIMESTAMP('2017-10-22 04:05:36' + INTERVAL '4 2' Hour)AS 'HOUR VALUE INCREASED BY 4'; +---------------------------+ | HOUR VALUE INCREASED BY 4 | +---------------------------+ | 2017-10-22 08:05:36 | +---------------------------+ 1 row in set, 1 warning (0.00 sec) mysql> ...
Read MoreHow to sort MySQL output on the basis of the column which is not in the result set?
It is quite possible to get the sorted output on the basis of the column which is not even the part of that output or not in the result set. It can be done by selecting the required fields and writing the name of the fields on the basis of which sorting order is desired. Following is an example to demonstrate it, in which we sorted out the result set, having ‘Name’ and ‘Address’ fields, on the basis of column ‘id’.mysql> Select Name, Subject From Student ORDER BY Id; +---------+-----------+ | Name | Subject | +---------+-----------+ | Gaurav ...
Read MoreWhat MySQL returns if we include time components along with date component as an argument to DATEDIFF() function?
MySQL DATEDIFF() function also works with date and time values but it ignores the time value. Hence even if we include the time value in DATEDIFF() function MySQL will return the difference, in days, between dates by ignoring the time values.mysql> Select DATEDIFF('2018-10-22 04:05:36', '2017-10-22 03:05:45'); +-------------------------------------------------------+ | DATEDIFF('2018-10-22 04:05:36', '2017-10-22 03:05:45') | +-------------------------------------------------------+ | 365 | +-------------------------------------------------------+ 1 row in set (0.00 sec) mysql> Select DATEDIFF('2017-10-22 04:05:36', '2017-10-22 03:05:45'); +-------------------------------------------------------+ | DATEDIFF('2017-10-22 04:05:36', ...
Read MoreWhich punctuation character can be used as the delimiter between MySQL date parts?
In this matter, MySQL permits us to use a relaxed format to date. We can use any punctuation character between date parts as a delimiter. Some examples are as follows −mysql> Select date ('2016/10/20'); +---------------------+ | date ('2016/10/20') | +---------------------+ | 2016-10-20 | +---------------------+ 1 row in set (0.00 sec) mysql> Select date('2016^10^20'); +--------------------+ | date('2016^10^20') | +--------------------+ | 2016-10-20 | +--------------------+ 1 row in set (0.00 sec) mysql> Select date ('2016@10@20'); +---------------------+ | date ('2016@10@20') | +---------------------+ | 2016-10-20 | +---------------------+ 1 row in set (0.00 sec) mysql> Select date ('2016+10+20'); +---------------------+ | date ('2016+10+20') | +---------------------+ | 2016-10-20 | +---------------------+ 1 row in set (0.00 sec)
Read MoreHow can I use any character, at the place of space, in MySQL TIMESTAMP to distinguish between date and time parts?
We can use the only character ‘T’ (in Capital form only) at the place of space between date and time part. It can be elucidated with the help of the following example −mysql> Select TIMESTAMP('2017-10-20T06:10:36'); +----------------------------------+ | TIMESTAMP('2017-10-20T06:10:36') | +----------------------------------+ | 2017-10-20 06:10:36 | +----------------------------------+ 1 row in set (0.00 sec)
Read MoreWhat MySQL returns on using any other character than 'T' or 'Space' between date and time parts?
In that case, MySQL will return all zeros at the place of time along with correct date part. An example is as follows in which we used character ‘W’ at the place of ‘T’ or ‘Space’ between date and time part −mysql> Select TIMESTAMP('2017-10-20W06:10:36'); +----------------------------------+ | TIMESTAMP('2017-10-20W06:10:36') | +----------------------------------+ | 2017-10-20 00:00:00 | +----------------------------------+ 1 row in set, 1 warning (0.00 sec)
Read MoreHow can MySQL interpret the number and string, having no delimiter, as a date?
If a string or number, even without any delimiter, in the format of YYYYMMDDHHMMSS or YYMMDDHHMMSS is making sense as the date is provided then MySQL interpret that string as a valid date.Examples are given for valid as well as invalid dates −mysql> Select Timestamp(20171022040536); +---------------------------+ | Timestamp(20171022040536) | +---------------------------+ | 2017-10-22 04:05:36 | +---------------------------+ 1 row in set (0.00 sec) mysql> Select Timestamp('20171022040536'); +-----------------------------+ | Timestamp('20171022040536') | +-----------------------------+ | 2017-10-22 04:05:36 | +-----------------------------+ 1 row in set (0.00 sec) mysql> Select Timestamp('171022040536'); +---------------------------+ | Timestamp('171022040536') | +---------------------------+ | 2017-10-22 04:05:36 ...
Read MoreHow many digits should be there in string or number so that it can be specified as a date value by MySQL?
While considering the year as 4-digit value, minimum of 8 digits in a string or number is required for MySQL to specify it as a date value. In this case, if we also want to store microseconds then the value can be up to a maximum of 20 digits.mysql> Select TIMESTAMP('20171022040536.100000'); +-----------------------------------+ | TIMESTAMP('20171022040536100000') | +-----------------------------------+ | 2017-10-22 04:05:36.100000 | +-----------------------------------+ 1 row in set, 1 warning (0.00 sec)The query above is taking 20 digits string for TIMESTAMP value. Last 6 digits are for microseconds.mysql> Select TIMESTAMP(20171022); +---------------------+ | TIMESTAMP(20171022) | +---------------------+ | 2017-10-22 00:00:00 | +---------------------+ ...
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