import org.apache.flink.table.functions.AggregateFunction; import java.util.Iterator; public class TestAggregateFunction extends AggregateFunction<Long, TestAggregateFunction.SumAll> { //返回最终结果 @Override publi
Aggregate functions Expand table FunctionDescription any(expr) Returns true if at least one value of expr in the group is true. any_value(expr[,ignoreNull]) Returns some value of expr for a group of rows. approx_count_distinct(expr[,relativeSD]) Returns the estimated number of di...
STRING_AGGis an aggregate function that takes all expressions from rows and concatenates them into a single string. Expression values are implicitly converted to string types and then concatenated. The implicit conversion to strings follows the existing rules for data type conversions. For more informa...
STRING_AGGis an aggregate function that takes all expressions from rows and concatenates them into a single string. Expression values are implicitly converted to string types and then concatenated. The implicit conversion to strings follows the existing rules for data type conversions. For more informa...
The LISTAGG function aggregates a set of strings into one string by concatenating the strings. Optionally, a separator string can be provided which is inserted between contiguous input strings.
For example, to filter out the sum of the grades of students with an average score greater than 60, if you do not use subqueries, you cannot add aggregate functions to WHERE in ordinary queries. For example, the following is an example of a syntax error: ...
SQL_AGGREGATE_FUNCTIONS 3.0 An SQLUINTEGER bitmask enumerating support for aggregation functions:SQL_AF_ALLSQL_AF_AVGSQL_AF_COUNTSQL_AF_DISTINCTSQL_AF_MAXSQL_AF_MINSQL_AF_SUMA SQL-92 Entry level-conformant driver will always return all of these options as supported. SQL_ALTER_DOMAIN 3.0 An ...
Aggregate Functions - avg Aggregate Functions - sum Functions on Sequences - empty Functions on Sequences - distinct-values Functions on Sequences - id Functions on Nodes - number Functions on Nodes - local-name Functions on Nodes - namespace-uri Functions on String Values - concat Functions on...
SQL_AGGREGATE_FUNCTIONS 3.0 An SQLUINTEGER bitmask enumerating support for aggregation functions:SQL_AF_ALLSQL_AF_AVGSQL_AF_COUNTSQL_AF_DISTINCTSQL_AF_MAXSQL_AF_MINSQL_AF_SUMA SQL-92 Entry level-conformant driver will always return all of these options as supported. SQL_ALTER_DOMAIN 3.0 An ...
For example, conditional aggregate functions can be used to implement the segment comparison functionality.-ArrayThe -Array suffix can be appended to any aggregate function. In this case, the aggregate function takes arguments of the 'Array(T)' type (arrays) instead of 'T' type arguments. ...