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Blocks & Variables
Anonymous block DECLARE section Variable assignment Constants Anchored %TYPE Anchored %ROWTYPE Nested blocks Labels NULL statement DBMS_OUTPUT
Control Flow
IF THEN IF ELSIF ELSE Simple CASE Searched CASE Basic LOOP WHILE LOOP Numeric FOR LOOP REVERSE FOR LOOP EXIT WHEN CONTINUE WHEN
SQL in PL/SQL
SELECT INTO DML and SQL%ROWCOUNT RETURNING INTO Implicit cursor attributes Cursor declaration Cursor FOR LOOP Parameterized cursor Cursor records FOR UPDATE cursor WHERE CURRENT OF
Exceptions
Predefined exception User-defined exception RAISE RAISE_APPLICATION_ERROR WHEN OTHERS SQLCODE and SQLERRM Exception propagation PRAGMA EXCEPTION_INIT Nested exception handler Reraising exception
Procedures & Functions
CREATE PROCEDURE IN parameter OUT parameter IN OUT parameter CREATE FUNCTION RETURN statement Default parameters Named notation Local subprogram Overloading
Packages
Package specification Package body Public procedure Private procedure Package variable Package initialization Package constant Package cursor Package overloading Forward declaration
Collections & Records
RECORD type Associative array Nested table VARRAY FIRST and LAST NEXT and PRIOR COUNT collection EXTEND DELETE collection element BULK COLLECT
Advanced PL/SQL
FORALL Dynamic SQL EXECUTE IMMEDIATE Dynamic SQL USING REF CURSOR Pipelined function Deterministic function Autonomous transaction Compound trigger Invoker rights AUTHID Native compilation hint
PL/SQL / Collections & Records

EXTEND

Learn EXTEND in PL/SQL through a focused explanation, a dedicated construct-specific example, an engineering boundary, and a mastery check.

10 min read • Advanced

EXTEND is an atomic PL/SQL topic inside Collections & Records. This lesson focuses on how the EXTEND construct is written, what it changes, and when it is the right tool.

Trace the example line by line. Identify the exact syntax for EXTEND, the input state before it runs, and the resulting value, control flow, database state, hardware behavior, or runtime effect afterward. Neighboring lessons use different constructs rather than renamed copies of this one.

Topic-specific example

plsql-07-08-extend.sql
plsql Try It Live 
DECLARE TYPE t IS TABLE OF NUMBER; a t:=t(); BEGIN a.EXTEND; a(1):=42; DBMS_OUTPUT.PUT_LINE(a(1)); END; /
Edge case / engineering note

For EXTEND, test the boundary that belongs to this exact feature rather than a generic failure case. Check invalid or empty input, NULL/unknown state, numeric limits, transaction or exception behavior, synthesis/runtime constraints, ownership/permission rules, or backtracking/control-flow effects where they apply.

Content source & attribution
Original Syntaxis Content · Original Syntaxis Content

Lesson quizzes

EXTEND Mastery Check →
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COUNT collection
NEXT →
DELETE collection element