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

新建模板小书匠



测试图片



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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

SELECT *
FROM author a
LEFT JOIN book b USING (author_id)

SELECT first_name, last_name
FROM customer
INTERSECT
SELECT first_name, last_name
FROM actor

SELECT first_name, last_name
FROM customer
EXCEPT
SELECT first_name, last_name
FROM staff
ORDER BY 1, 2

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