oracle内存表在查询和报表的时候用的比较多,它的速度相对物理表要快几十倍。 simple example:1、table()结合数组:*/create or replace type t_testasobject( id integer, rq date, mc varchar2(60) ); create or replace type t_test_tableastable of t
1. 用游标传递数据利用游标 REF CURSOR 可将数据集(多行记录)传递到PL/SQL函数: SELECT * FROM TABLE (myfunction (CURSOR (SELECT * FROM mytab))); 2. 利用两个实体化视图(或表)作为样板数据CREATE MATERIALIZED VIEW sum_sales_country_mv BUILD IMMEDIATE REFRESH COMPLETE ENABLE QUERY REWRITE AS SELECT...
select * fromtable(cast(f_int_date_varchar2() as table_int_date_varchar2)); drop function f_int_date_varchar2; drop type table_int_date_varchar2; drop type type_int_date_varchar2; 2.A Function that returns a table of dates in a Range create or replace type date_obj as object (d...
The interface approach requires the user to supply a type that implements a predefined Oracle interface consisting of start, fetch, and close operations. The type is associated with the table function when the table function is created. During query execution, the fetch method is invoked repeatedly...
Oracle Table Function Oracle Table Function在Oracle9i时引入。完美的兼容了view和存储过程的长处: 应用举例: 1.Table()函数: set feedback off create or replace type type_int_date_varchar2 as object (i integer, d date, v varchar2(99)) /
which can be used only in a single database(as explained in OracleDatabase Object-Relational Developer's Guide). Although the return type ofa pipelined table function might appear to be a PL/SQL type, the databaseactually converts that PL/SQL type to a corresponding SQL use...
inStreamingMode() .build(); StreamTableEnvironment tEnv = StreamTableEnvironment.create(env, bsSettings); tEnv.registerFunction("split", new Split(" ")); tEnv.registerFunction("duplicator", new DuplicatorFunction()); tEnv.registerFunction("flatten", new FlattenFunction()); 构造数据源 代码...
Sometimes—as in the performance and memory test in the previous section—you will want to terminate the pipelined table function before all rows have been piped back. Oracle Database will then raise theNO_DATA_NEEDEDexception. This will terminate the function but willnotterminate theSELECTstatement...
Hash – uses an internal function to choose which partition to place rows inWhen you add rows to the table, they will go in the relevant partition.For example, you may want to split up your toys by colour. To do so, list partition it by this column. And define which values will...
Oracle OLAP DML ReferenceOLAP_TABLE Syntax The OLAP_TABLE function returns the table of objects which has been populated according to the mapping rules defined in limit_map. The order in which OLAP_TABLE processes information specified in input parameters is described in "Order of Processing in OL...