1、安装Redis：
（1）下载地址：https://github.com/MicrosoftArchive/redis/releases
（2）解压下载的zip文件，将bin文件夹里的redis-serve
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SELECT
SUM(CASE WHEN sex=男 THEN 1 ELSE 0 END) AS 男生人数,
SUM(CASE WHEN sex=女 THEN 1 ELSE 0 END) AS 女生人数
F
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```
SELECT student_name,AVG(grade) as avg_grade,(SELECT COUNT(DISTINCT(AVG(grade))) FROM student_grade WHERE
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```
SELECT * FROM SCORE
ORDER BY SUBJECT, SCORE DESC
LIMIT 3;
```
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```
SELECT s_no,s_name
FROM student
WHERE s_no IN (SELECT s_no
FROM course
GRO
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PHP中使用CURL实现GET请求：
```
```
PHP中使用CURL实现POST请求：
```
```
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