Nt.DELETE(2, 4) - Delete range of elementsĮxample 5-20 DELETE Method with Associative Array Indexed by String The type nt_type and procedure print_nt are defined in Example 5-6. The procedure print_nt prints the nested table variable after initialization and after each DELETE operation. The restored elements occupy the same memory as the corresponding deleted elements. This example declares a nested table variable, initializing it with six elements deletes and then restores the second element deletes a range of elements and then restores one of them and then deletes all elements. For varray parameters, the value of LIMIT is always derived from the parameter type definition, regardless of the parameter mode.Įxample 5-19 DELETE Method with Nested Table You can apply collection methods to such parameters. In a subprogram, a collection parameter assumes the properties of the argument bound to it. (For general information about PL/SQL subprograms, see PL/SQL Subprograms.) methodįor detailed syntax, see " Collection Method Invocation".Ī collection method invocation can appear anywhere that an invocation of a PL/SQL subprogram of its type (function or procedure) can appear, except in a SQL statement. The basic syntax of a collection method invocation is: collection_name. Returns index that succeeds specified index. Returns index that precedes specified index. Returns maximum number of elements that collection can have. Returns number of elements in collection. Returns TRUE if and only if specified element of varray or nested table exists. Testify(quantity => ( CARDINALITY(SET(nt3)))) - 2 functionsĭeletes elements from end of varray or nested table.Īdds elements to end of varray or nested table. Testify(quantity => ( CARDINALITY(nt3))) - function Testify(truth => ( nt1 IS EMPTY)) - condition Testify(truth => ( nt3 IS NOT A SET)) - condition Testify(truth => ( nt3 IS A SET)) - condition Testify(truth => ( 4 MEMBER OF nt1)) - condition Testify(truth => ( nt1 NOT SUBMULTISET OF nt4)) - condition Testify(truth => ( nt1 SUBMULTISET OF nt3)) - condition Testify(truth => ( nt1 IN (nt2,nt3,nt4))) - condition You can view and run this example on Oracle Live SQL at Comparing Nested Tables with SQL Multiset Conditions DECLARE nt.LAST LOOP - For first to last elementĭBMS_OUTPUT.PUT_LINE('Result: ' || output) Īnswer := nt1 MULTISET UNION DISTINCT nt3 Īnswer := nt2 MULTISET INTERSECT DISTINCT nt3 Īnswer := nt3 MULTISET EXCEPT DISTINCT nt2 PROCEDURE print_nested_table (nt nested_typ) ISĭBMS_OUTPUT.PUT_LINE('Result: null set') ĭBMS_OUTPUT.PUT_LINE('Result: empty set') įOR i IN nt.FIRST. You can view and run this example on Oracle Live SQL at Assigning Set Operation Results to Nested Table Variable DECLARE If the value of NLS_SORT ends in _CI (case-insensitive comparisons) or _AI (accent- and case-insensitive comparisons), then indexes that differ only in case, accented characters, or punctuation characters might be converted to the same value. If the value of NLS_DATE_FORMAT changes, then the value of (TO_CHAR(SYSDATE)) might also change.ĭo not use different NVARCHAR2 indexes that might be converted to the same VARCHAR2 value.ĭo not use CHAR or VARCHAR2 indexes that differ only in case, accented characters, or punctuation characters. ![]() If your indexes have data types other than VARCHAR2 and its subtypes, ensure that these indexes remain consistent and unique if the values of initialization parameters change. However, you can populate the associative array with indexes of any data type that the TO_CHAR function can convert to VARCHAR2. In the declaration of an associative array indexed by string, the string type must be VARCHAR2 or one of its subtypes. You can create a collection of records, and a record that contains collections. To create a record variable, you either define a RECORD type and then create a variable of that type or use %ROWTYPE or %TYPE. You can access each field of a record variable by its name, with this syntax: variable_name.field_name. In a record, the internal components can have different data types, and are called fields. To create a collection variable, you either define a collection type and then create a variable of that type or use %TYPE. You can access each element of a collection variable by its unique index, with this syntax: variable_name ( index ). In a collection, the internal components always have the same data type, and are called elements. If you pass a composite variable as a parameter to a remote subprogram, then you must create a redundant loop-back DATABASE LINK, so that when the remote subprogram compiles, the type checker that verifies the source uses the same definition of the user-defined composite variable type as the invoker uses.
0 Comments
Leave a Reply. |