2017-4-24(1493037086057未命名文件 测试资源是否正确上传

2017-4-24(1493037086057未命名文件 测试资源是否正确上传

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SELECT *
FROM author a
JOIN book b USING (author_id)
 
UNION
 
SELECT a.*, NULL, NULL, NULL, ..., NULL
FROM (
  SELECT a.*
  FROM author a
   
  EXCEPT
   
  SELECT a.*
  FROM author a
  JOIN book b USING (author_id)
) a

1. SELECT * 

   ---

2. FROM author a 

   ---

3. LEFT JOIN book b USING (author_id) 

   ---

1. SELECT first_name, last_name 

   ---

2. FROM customer 

   ---

3. INTERSECT 

   ---

4. SELECT first_name, last_name 

   ---

5. FROM actor 

   ---

1. SELECT first_name, last_name 

   ---

2. FROM customer 

   ---

3. EXCEPT 

   ---

4. SELECT first_name, last_name 

   ---

5. FROM staff 

   ---

6. ORDER BY 1, 2 

   ---

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