PLS-00103:遇到符号"END".当期望+& =等 [英] PLS-00103: Encountered the symbol "END" when expecting + & = etc

问题描述

这是我的代码:

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;
/

这是完整的错误代码:

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.

我正在学习PL/SQL，正在尝试从书中举一个例子，但看来我做错了，请不要仅仅给出答案，我想知道您是如何解决此问题以及我是如何犯错的

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.

推荐答案

您的最终子句应使用ELSE而不是WHEN:

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;

更新

向您提供有关如何解决此问题的建议并不容易(因为这在很大程度上取决于个人喜好)；我通常尝试的事情是

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

• 缩小示例范围(在您的情况下，请删除CASE中的所有其他子句)
• 从头开始重写查询中令人讨厌的部分
• 复制一个有效的相似查询，并逐渐更改该查询以使其类似于有问题的查询，直到遇到错误为止

• 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

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