sql 02-select.sql的

Posted 2021-05-13

SELECT *
FROM wizard
WHERE 
is_muggle = 0 AND
birthday BETWEEN '1975-01-01' AND '1985-12-31';

+----+-----------+----------+------------+-------------+---------------------------------------+-----------+
| id | firstname | lastname | birthday   | birth_place | biography                             | is_muggle |
+----+-----------+----------+------------+-------------+---------------------------------------+-----------+
|  1 | harry     | potter   | 1980-07-31 | london      |                                       |         0 |
|  2 | hermione  | granger  | 1979-09-19 |             | Friend of Harry Potter                |         0 |
|  4 | ron       | weasley  | 1980-03-01 |             | Best friend of Harry                  |         0 |
|  5 | ginny     | weasley  | 1981-08-11 |             | Sister of Ron and girlfriend of Harry |         0 |
|  6 | fred      | weasley  | 1978-04-01 |             |                                       |         0 |
|  7 | george    | weasley  | 1978-04-01 |             |                                       |         0 |
| 10 | drago     | malefoy  | 1980-06-05 |             |                                       |         0 |
+----+-----------+----------+------------+-------------+---------------------------------------+-----------+
7 rows in set (0.06 sec)

-------------------------------------------------------

SELECT firstname
FROM wizard
WHERE firstname LIKE 'H%';

+-----------+
| firstname |
+-----------+
| harry     |
| hermione  |
+-----------+
2 rows in set (0.07 sec)

-------------------------------------------------------

SELECT firstname , lastname
FROM wizard
WHERE lastname ='Potter'
ORDER BY firstname ASC;

+-----------+----------+
| firstname | lastname |
+-----------+----------+
| harry     | potter   |
| lily      | potter   |
+-----------+----------+
2 rows in set (0.07 sec)

-------------------------------------------------------

SELECT firstname , lastname ,birthday
FROM wizard
ORDER BY birthday ASC LIMIT 0,1;

+-----------+------------+------------+
| firstname | lastname   | birthday   |
+-----------+------------+------------+
| albus     | dumbledore | 1881-07-01 |
+-----------+------------+------------+
1 row in set (0.00 sec)