Keeping Code Consistent with User-Defined Subtypes : Subtype Custom Type « PL SQL Data Types

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Oracle PL/SQL Tutorial » PL SQL Data Types » Subtype Custom Type

21. 36. 2. Keeping Code Consistent with User-Defined Subtypes


declare

  subtype newSubtype is standardType [NOT NULL];

You can create subtypes in the declaration portions of procedures, functions, anonymous blocks, packages, or package bodies.


create or replace package pkg_global

 is

      subtype large_string  is VARCHAR2(2000);

      subtype medium_string is VARCHAR2(256);

      subtype small_string  is VARCHAR2(10);

      subtype flag_yn       is VARCHAR2(1) not null;

 end;

 /

Referencing Subtypes


SQL>

SQL> declare

  2      v_medium_tx pkg_global.medium_string;

  3      v_small_tx  pkg_global.small_string := 'ABC';

  4      v_flag_yn   pkg_global.flag_yn :='N';

  5  begin

  6     v_medium_tx:=v_small_tx||'-'||v_flag_yn;

  7  end;

  8  /



PL/SQL procedure successfully completed.



SQL>

SQL>

21. 36. Subtype Custom Type
	21. 36. 1.	Defining Your Own Datatypes
	21. 36. 2.	Keeping Code Consistent with User-Defined Subtypes

Keeping Code Consistent with User-Defined Subtypes : Subtype Custom Type « PL SQL Data Types « Oracle PL/SQL Tutorial