for idx in 1..10 loop dbms_output.put_line(v_example_tab(idx)); end loop; end; (4) 删除index-by表的内容,整个index-by的内容删除掉 declare type num_table is table of number index by binary_integer; v_example_tab num_table; v
TYPE type_name IS TABLE OF element_type [NOT NULL] INDEX BY BINARY_INTEGER; 关键字是INDEX BY BINARY_INTEGER,没有这个关键字,那么集合将是一个嵌套表。由于不存储在数据库中, element_type可以是任何合法的PL/SQL数据类型,包括:PLS/INTEGER、SIGNTYPE、和BOOLEAN。 索引表的下标可以为负,并且元素个数没有...
与很多语言一样,oracle也有其集合结构,首先向大家介绍 :index-by表 index-by 类似c,c++,java中的数组. 一. 定义语法为: TYPE TableType IS TABLE OF type INDEX BY BINARY_INTEER; 二. 示例 1. 类型为字符串 sql 代码 Declare Type characterTabIsTableOfVarchar2(10)IndexByBinary_Integer; v_characters ch...
CREATE TABLE Person (Id int, Name varchar(255)); BEGIN FOR i IN 1..4 LOOP insert into person values(i,’abc’||i); END LOOP; commit; END; DECLARE CURSOR cursor_person is select name from person; TYPE person_list IS TABLE of %type INDEX BY binary_integer; name_list person_list; ...
有些情况下虽然在查询栏位中定义了index,但是PLSQL并没有走该栏位的索引,因为Oracle在解析计划时一种基于Role,一种是基于Cost有些情况下走Index的效率比全表扫秒更低,并不是建了Index,PLSQL性能会成倍提高,更糟的情况下,建Index还会导致性能比原来无索引更糟,这里有个理解误区,所以稍微提一下 ;) ...
PL/SQL offers A variety of data types for use, and these data types can be categorized into four broad classes: scalar data types, composite data types, object data types, and other PL/SQL-specific data types. Of these, the scalar data types are the ones in the NUMBER family and its ...
To register a PL/SQL index-by table as an OUT parameter, use the registerIndexTableOutParameter() method defined in the OracleCallableStatement class. synchronized registerIndexTableOutParameter (int paramIndex, int maxLen, int elemSqlType, int elemMaxLen) throws SQLException Table 11-3 describ...
索引还有更细致的参数控制,默认为开启,_index_prefetch_factor为索引预取因子,默认为100,如果变小则更倾向于index prefetching。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 SQL> @sp index_block_pre -- show parameter by sp -- show hidden parameter by sp old 3: where x.indx=y.in...
图示中的SQL执行顺序即为: INDEX RANGE SCAN —> TABLE ACCESS BY GLOBAL INDEX ROWID —> INDEX UNIQUE SCAN —> TABLE ACCESS BY INDEX ROWID —> NESTED LOOPS OUTER —> SORT GROUP BY —> SELECT STATEMENT, GOAL = ALL_ROWS (注:PLSQL提供了查看执行顺序的功能按钮(上图中的红框部分) ) ...
commit implied by, 16-5 defined, 1-52 described, 15-4 embedding in PL/SQL, 15-20 locks, 24-29 parallel DDL, 23-3 parsing with DBMS_SQL, 15-20 processing statements, 15-15 roles and privileges, 27-21 data dictionary access to, 2-3 adding objects to, 2-5 ALL ...