CUME_DIST () over (by Order) : full table of data or less than the total number of records and the record
LAG () over (by Partition) : Take the specified field value records
Lead () over (by Partition) : Take specified field values in records
NTILE (n-) over (by Order) : all records in the specified field in the 1 / n
Percent () over (by Partition) : Percentage
Date:
current_timestamp () and now () is equivalent to : the current timestamp
FROM_UNIXTIME () : Switch to unix time
unix_timestamp () : Switch to unix timestamp
Find the time difference ( first differencing into the number of seconds, minutes, empathy ) : the SELECT FROM_UNIXTIME (timestamp1) -from_unixtime (timestamp2)
Switch timestamp ( sensitive note time format ) : from_timestamp ( '2019-11-12', 'YYYY / the MM / dd HH: mm: SS: SSSSSS')
DATE_ADD ( '2019-10-10',. 3) : After three days
date_sub ( '2019-10-10', 3) is equivalent to SUBDATE ( '2019-10-10',. 3) : three days
DATEDIFF (new new, Old) : date interval
timestamp_cmp (new new, Old) : differencing timestamp, the result is the difference between the number of days
DAYOFWEEK : The first few days a week (Sunday is the first day abroad)
String:
base64decode (string str): base64 decoding.
Base64Encode (STR String): Base64 encoding.
CONCAT_WS ( '-', 'A', 'B', ...) : splicing the specified string delimiter
FIND_IN_SET (STR String, String strlist) : search string in a comma-separated list strlist string, the result is a list of indices, the subscript starting at 1, 0 is not found there, if one of two parameters null, the return value is null.
TypeConversion:
cast(): cast('1' as BIGINT)
