21 ODCIAggregateMerge(self IN OUT string_agg_type, 22 ctx2 IN string_agg_type) 23returnnumber 24 ); 25 / Type created. scott@ORA9I.WORLD> scott@ORA9I.WORLD> create or replace type body string_agg_type 2 is 3 4s
Introduction to Oracle aggregate functions# Oracle aggregate functions calculate on a group of rows and return a single value for each group. We commonly use the aggregate functions together with theGROUP BYclause. TheGROUP BYclause divides the rows into groups and an aggregate function calculates a...
string_agg | text | text, text | agg | string_agg_transfn | string_agg_finalfn string_agg | bytea | bytea, bytea | agg | bytea_string_agg_transfn | bytea_string_agg_finalfn (2 rows) SELECT p.proname AS function_name, pg_catalog.pg_get_function_result(p.oid) AS result_typ...
在Oracle数据库中可以使用两种主要类型的参数: 单行函数(single row function)单行函数同时只能对一行进行操作,且对输入的每一行返回一行输出结果。单行函数的示例是CONCAT(x,y),其功能是将y添加到x上,并返回所得到的字符串 聚合函数(aggregate function)聚合函数同时可以对多行进行操作,并返回一行输出结果。聚合函数...
string that is to separate the measure values. This clause is optional and defaults to NULL. ■ The order_by_clause determines the order in which the concatenated values are returned. The function is deterministic only if the ORDER BY column list achieved unique ordering. The return data type...
public AggregationFunctionExpression(java.lang.String functionName, FunctionArgument arg, AggregateOverClause overClause) Creates an AggregationFunctionExpression that resolves to the aggregation function with the function argument and OVER clause. Parameters: functionName - A String that contains the name ...
member function ODCIAggregateMerge(self in out string_sum_obj, v_next in string_sum_obj) return number, --当查询语句并行运行时,才会使用该方法,可将多个并行运行的查询结果聚合 member function ODCIAggregateTerminate(self in string_sum_obj, return_value out varchar2 ,v_flags in number) return num...
MEMBER FUNCTION ODCIAggregateMerge(self IN OUT string_agg_type, ctx2 IN string_agg_type) RETURN NUMBER ); CREATE OR REPLACE TYPE BODY string_agg_type IS STATIC FUNCTION ODCIAggregateInitialize(sctx IN OUT string_agg_type)RETURN NUMBER IS BEGIN sctx := string_agg_type(NULL, NULL); RETURN...
public java.lang.String getAlias() Description copied from class: DictionaryComponent Get alias of DictionaryComponent. Alias is set to its name by default. Specified by: getAlias in interface UnnamedComponent Overrides: getAlias in class DictionaryComponent<Aggregate> Returns: alias of the dictionary...
LAG是一个分析函数。它可以在不使用自连接的情况下同时访问到一个表的多行数据。给一个或多个列名和一个游标位置(位移),LAG可以访问当前行之前的行,行之间间隔的行数为位移值。 语法树中的offset(位移)参数是可选的,可以指定一个大于0的整数,如果不指定offset(位移)参数函数会默认位移为1。语法...