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PL/SQL / Procedures & Functions

Default parameters

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

10 min read • Intermediate

Default parameters is an atomic PL/SQL topic inside Procedures & Functions. This lesson focuses on how the Default parameters construct is written, what it changes, and when it is the right tool.

Trace the example line by line. Identify the exact syntax for Default parameters, 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-05-07-default-parameters.sql
plsql Try It Live 
CREATE OR REPLACE PROCEDURE log_msg(p_msg VARCHAR2,p_level VARCHAR2 DEFAULT 'INFO') IS BEGIN DBMS_OUTPUT.PUT_LINE(p_level||':'||p_msg); END; /
Edge case / engineering note

For Default parameters, 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

Default parameters Mastery Check →
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Named notation