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PL/SQL / Exceptions

Nested exception handler

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

10 min read • Intermediate

Nested exception handler is an atomic PL/SQL topic inside Exceptions. This lesson focuses on how the Nested exception handler construct is written, what it changes, and when it is the right tool.

Trace the example line by line. Identify the exact syntax for Nested exception handler, 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-04-09-nested-exception-handler.sql
plsql Try It Live 
BEGIN BEGIN SELECT 1/0 INTO :x FROM dual; EXCEPTION WHEN ZERO_DIVIDE THEN DBMS_OUTPUT.PUT_LINE('inner'); END; END; /
Edge case / engineering note

For Nested exception handler, 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

Nested exception handler Mastery Check →
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PRAGMA EXCEPTION_INIT
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Reraising exception