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PL/SQL / Control Flow

IF ELSIF ELSE

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

10 min read • Beginner

IF ELSIF ELSE is an atomic PL/SQL topic inside Control Flow. This lesson focuses on how the IF ELSIF ELSE construct is written, what it changes, and when it is the right tool.

Trace the example line by line. Identify the exact syntax for IF ELSIF ELSE, 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-02-02-if-elsif-else.sql
plsql Try It Live 
DECLARE v_n NUMBER:=0; BEGIN IF v_n>0 THEN DBMS_OUTPUT.PUT_LINE('positive'); ELSIF v_n<0 THEN DBMS_OUTPUT.PUT_LINE('negative'); ELSE DBMS_OUTPUT.PUT_LINE('zero'); END IF; END; /
Edge case / engineering note

For IF ELSIF ELSE, 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

IF ELSIF ELSE Mastery Check →
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Simple CASE