spark sql date functions

sys. dbms_random.value (0, 1) value from dual;13. Get the symbolS: select sign (-8) value-1O: select sign (-8) value from dual-1---------- Mathematical functions14. Circumference RateS: select pi () value 3.1415926535897931O: Unknown15. sin, cos, and tan parameters are in radians.For example, select sin (PI ()/2) value to get 1 (SQLServer)16. Asin, Acos, Atan, Atan2 return radians17. radian angle Interchange (, Oracle unknown)DEGREES: Radian-> AngleRADIANS: Angle-> radian--------- Comparison of

time difference (in seconds ): (Days (T1)-days (T2) * 86400 +(Midnight_seconds (T1)-midnight_seconds (T2 )) For convenience, you can also create SQL user-defined functions in the preceding method: Create Function secondsdiff (T1 timestamp, T2 timestamp)Returns intReturn ((Days (T1)-days (T2) * 86400 +(Midnight_seconds (T1)-midnight_seconds (T2 )))@ To determine whether a given year is a leap year, t

Record an SQL statement first.Select uid, rank, money, e, from_unixtime (time/1000) from stats_2012_01_19 where comm = 8888 and e> 40 and from_unixtime (time/1000) between '2017-01-19 00:00:00 'and '2017-01-19 01:00:00'Then start to convert .....001MySQL Date and Time Functions002003DAYOFWEEK (date)004The return date i

the time difference (in seconds ): (Days (T1)-days (T2) * 86400 +(Midnight_seconds (T1)-midnight_seconds (T2 )) For convenience, you can also create SQL user-defined functions in the preceding method: Create Function secondsdiff (T1 timestamp, T2 timestamp)Returns intReturn ((Days (T1)-days (T2) * 86400 +(Midnight_seconds (T1)-midnight_seconds (T2 )))@ To determine whether a given year is a leap year, the

) * 86400 +(Midnight_seconds (T1)-midnight_seconds (T2 )) For convenience, you can also create SQL user-defined functions in the preceding method: Create Function secondsdiff (T1 timestamp, T2 timestamp)Returns intReturn ((Days (T1)-days (T2) * 86400 +(Midnight_seconds (T1)-midnight_seconds (T2 )))@ To determine whether a given year is a leap year, the following is a useful

convenience, you can also create SQL user-defined functions in the preceding method:Create function secondsdiff (t1 TIMESTAMP, t2 TIMESTAMP)RETURNS INTRETURN ((DAYS (t1)-DAYS (t2) * 86400 +(MIDNIGHT_SECONDS (t1)-MIDNIGHT_SECONDS (t2 )))@To determine whether a given year is a leap year, the following is a useful SQL function. You can create it to determine the nu

It is very inconvenient to process dates in PHP, for example, to find the month of the difference between two dates? What should I do? File name: date. inc. php3 before using these two functions, you must first convert the date or date to the timestamp type. For example: $ todaymktime (, 0,

, day, hour, minute, and second of the difference between the current date and the target date: The code is as follows:Copy code Select datediff (yy, '2017-01-01 14:12:01 ', getdate ())Select datediff (q, '2017-01-01 14:12:01 ', getdate ())Select datediff (m, '2017-01-01 14:12:01 ', getdate ())Select datediff (ww, '2017-01-01 14:12:01 ', getdate ())Select datediff (d, 

File name: date. inc. php3 before using these two functions, you must first convert the date or date to the timestamp type. For example: $ todaymktime (0, 0, 0, date (m), date (d), date

The common time format mask is as follows:Mask element meaningYYYY four-digit year (for example, 2005) yearYY two-digit year (for example, 05)Q quarter (1-4)MM month (01-12) monthThe number of weeks in WW (1-53), in which the first week is the first day to the seventh day of the year.The number of weeks in the month of W (1-5), in which the first week is the first day of the month to the seventh dayDay of DDD (1-366)DD Day (1-31)Day of week D (1-7), where Sunday is 1 and Saturday is 7HH24 in 24-

Label:Original: SQL Server function Full solution One: Data type conversion functionWhen you work with values of different data types at the same time, SQL Server typically automatically makes a hermit type conversion. Values that are similar to data types are valid, such as int and float, but for other data types, such as Integer and character types, the Hermit transform cannot be implemented, and the disp

necessary to convert each other, the following gives the conversion of several different ways. One, complete in MySQL This way in the MySQL query statement conversion, the advantage is not to occupy PHP parser parsing time, fast, the disadvantage is only used in database query, there are limitations. 1. UNIX timestamp converted to date function: From_unixtime () General form: Select From_unixtime (1156219870); 2.

The first day (Datefirst) setting determines which day your system uses as the first day of the week. All of the following examples are established in Sunday as the first day of the week, with the first day set to 7. If your first day setting is not the same, you may need to adjust these examples so that it matches the different first-day settings. You can check the first day setting by using the @ @DATEFIRST function. Let's review the DateDiff and DATEADD