Oracle语句缺少表达式

Question

我无法从以下陈述中找出缺失的表达方式。我错过了什么？非常感谢任何帮助。

SELECT c.first || ' ' || AS "Name", s.start_date AS "PROB Start Date", s.end_date AS "PROB End Date", pc.con_freq AS "Frequency" 

FROM criminals c, sentences s, prob_contact pc 

WHERE c.criminal_id = s.criminal_id

AND s.violations BETWEEN pc.low_amt AND pc.high_amt;

就JOIN而言，它将是这样的：（更正后的陈述）

SELECT c.first || ' ' || c.last AS "Name", s.start_date AS "PROB Start Date", s.end_date AS "PROB End Date", pc.con_freq AS "Frequency"

FROM criminals c JOIN sentences s ON c.criminal_id = s.criminal_id

JOIN prob_contact pc ON s.violations BETWEEN pc.low_amt AND pc.high_amt;

Answer 1

这是第一个表达式：

SELECT c.first || ' ' || AS "Name", . . .
-------------------------^

大概你的意思是：

SELECT c.first || ' ' || c.last AS "Name", . . .

此外，您应该学习使用显式join语法（尽管这与您的问题无关）。