oracle case when 缺失等号

在Oracle的CASE WHEN语法中，缺失等号是不合法的。CASE WHEN语法的基本结构是：
CASE search_expression
WHEN expression1 THEN result1
WHEN expression2 THEN result2
...
ELSE default_result
END
在每个WHEN子句中，需要使用等号来判断search_expression和expression的关系。例如：WHEN t.vc_state = '2' THEN t.vc_userId表示当t.vc_state等于'2'时，将t.vc_userId作为结果返回。所以在CASE WHEN语法中，等号是必不可少的。 <span class="em">1</span><span class="em">2</span><span class="em">3</span>
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