PLS-00103: Encountered the symbol “END” when expecting + & = etc

问题

This is my code:

DECLARE 
v_grade CHAR(1) := UPPER('&grade');
appraisal VARCHAR(20);
BEGIN
appraisal := CASE v_grade
WHEN 'A' THEN 'Excellent'
WHEN 'B' THEN 'Very Good'
WHEN 'C' THEN 'Good'
WHEN 'No such grade'
END;
DBMS_OUTPUT.PUT_LINE('Grade: '||v_grade||'Appraisal '||appraisal);
END;
/

this is the full error code:

ERROR at line 10:
ORA-06550: line 10, column 1:
PLS-00103: Encountered the symbol "END" when expecting one of the following:
 * & = - + < / > at in is mod remainer not rem then
 <an exponent (**)> <> or != or ~= >= <= <> and or like like2
 like4 between || multiset member submultiset.

I'm learning PL/SQL and I was trying an example from my book but it seems I did something wrong, please don't just give the answer I want to know how you troubleshooted this and how I did make the mistake.

回答1:

Your final clause should use ELSE instead of WHEN:

DECLARE 
  v_grade CHAR(1) := 'C';
  appraisal VARCHAR(20);
BEGIN
  appraisal := 
    CASE v_grade
      WHEN 'A' THEN 'Excellent'
      WHEN 'B' THEN 'Very Good'
      WHEN 'C' THEN 'Good'
      ELSE  'No such grade'
    END;
  DBMS_OUTPUT.PUT_LINE('Grade: '||v_grade||', Appraisal '||appraisal);
END;

UPDATE

Giving you advice on how to troubleshoot this isn't easy (since it's largely a matter of personal preference); things I usually try are

narrow down the example (in your case, get rid of all additional clauses in the CASE)
rewrite the offending part of the query from scratch
copy a similary query that works and change that query gradually to resemble the offending query until I encounter the error

回答2:

Rewrite code like this

DECLARE 
v_grade CHAR(30) := UPPER('&grade');
appraisal VARCHAR(20);
BEGIN
appraisal := CASE v_grade
WHEN 'A' THEN 'Excellent'
WHEN 'B' THEN 'Very Good'
WHEN 'C' THEN 'Good'
ELSE 'No such grade'
END;
DBMS_OUTPUT.PUT_LINE('Grade: '||v_grade||'Appraisal '||appraisal);
END;

来源：https://stackoverflow.com/questions/36648463/pls-00103-encountered-the-symbol-end-when-expecting-etc

标签

Oracle

plsql

oracle11g

pls-00103