3.4 Getting Information About Databases and Tables

获取数据库和表格的信息

如果你忘记了数据库或者表格的名字怎么办?或者给定的表格的结构怎么办?(例如你知道都有哪些列,叫什么名字吗)

mysql 有几种方法能解决这个问题

从前文你已经知道,可以通过Show databases;语句查看数据库,通过 Database()函数能知道当前选择的数据库

mysql> SELECT DATABASE();

aaarticlea/png;base64,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" alt="" />

如果你什么数据库也没选择,这条语句执行的结果是Null,如下图

aaarticlea/png;base64,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" alt="" />
通过下面的语句,可以查看当前数据库有哪些列表
mysql> SHOW TABLES;

aaarticlea/png;base64,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" alt="" />

请注意,是Tables,而不是Tables(),没有这个函数

如果想查看数据库的结果,那么就可以用Describe语句,它会将数据库的每一列都展示出来
mysql> DESCRIBE pet;

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" alt="" />

注意,它展示的是结构,数据类型等信息,并不是表的完整信息
Field展示列的名字,Type是数据类型。NULL说明这一列可以插入Null值,key说明这一列是否被索引,default说明它的默认值,最后Extra说明特殊信息。如果某一列被 设成AUTO_INCRMENT,它的值会自动递增
如果某一列被索引了,那么可以通过Show INdex From Tbl_name查看相应信息。

3.5 Using mysql in Batch Mode

用mysql批处理模式。

在前面的章节中,你通过mysql的交互模式输入语句,并查看结果。事实上,你可以使用mysql的批处理模式。

要做到这点,你需要将要运行的语句写到文件中,然后告诉Mysql去读取,并运行它。

shell> mysql < batch-file
如果你的系统是window,而批处理文件里面包含一些特殊字符,那么,恭喜你,可能会发生一些错误,你可以这样做
C:\> mysql -e "source batch-file"
如果你需要通过命令行指定连接的参数,那么命令可以是这样的
shell> mysql -h host -u user -p < batch-file
Enter password: ******** 如果你这样做,最好写一个脚本,然后执行这个脚本。
如果你想即使执行批处理文件发生了一些错误也要继续执行,那么你应该使用--force命令行参数(霸王硬上弓模式)
为什么要写脚本呢?
1.例如,有些语句,每天或者每周都要运行一次,写成脚本就能避免一次又一次的重复造轮子。
2.你可以从已经写好的脚本相似中复制,然后修改下就行了
3.批处理模式同样适用于你在开发多行语句时,如果你不小心弄错了,你不用重新输入,只需要修改正确,然后让mysql再次执行就可以 了
4.如果你的语句执行结果有茫茫多,你可以一页一页的输出,而不是看着它在你的屏幕上翻滚。
shell> mysql < batch-file | more

5.你也可以将结果输出到文件,以做进一步的处理
shell> mysql < batch-file > mysql.out
6.你可以将你的脚本展示给你的小伙伴,让它们也可以用它。
7.还有一些情况不能使用交互模式,如果在运行一个计划任务时,这种情况下,你必须使用批处理模式 当然,交互模式与批处理模式输出的结果形式可能有些不同
aaarticlea/png;base64,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" alt="" /> 批处理的如下图
aaarticlea/png;base64,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" alt="" />
如果你说,我要用批处理模式,但是我也要交互模式的那种结果,那么你就应该使用:mysql -t.如果你想回显执行结果:mysql -V 下面两种形式都会执行文件
mysql> source filename;
mysql> \. filename

3.6 Examples of Common Queries 常见查询实例
这里以shop表 为例(本例使用test数据库)
首先进入数据库
shell> mysql your-database-name

创建shop表:
aaarticlea/png;base64,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" alt="" />
article 是指物品,dealer指商人。 插入数据: aaarticlea/png;base64,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" alt="" /> 现在来查看下刚才插入的数据:
SELECT * FROM shop;

aaarticlea/png;base64,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" alt="" />

3.6.1 The Maximum Value for a Column

求某一列的极大值:

这里求哪件商品的序号最大

SELECT MAX(article) AS article FROM shop;

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3.6.2 The Row Holding the Maximum of a Certain Column

找出最贵的那件物品的商品序号,及商人
可以用一个子句:
SELECT article, dealer, price
FROM shop
WHERE price=(SELECT MAX(price) FROM shop);

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" alt="" />

这是相当于先把最大值求出,再将这个最大值作为查询条件使用。

另一种方法是用"Left Join" 或者用mysql的 LIMIT 子句将所有列降序排序,然后取第一行。
SELECT s1.article, s1.dealer, s1.price
FROM shop s1
LEFT JOIN shop s2 ON s1.price < s2.price
WHERE s2.article IS NULL;

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" alt="" />


SELECT article, dealer, price
FROM shop
ORDER BY price DESC
LIMIT 1;

aaarticlea/png;base64,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" alt="" />

注:如果表中有多处19.95的商品,也就是说最高价商品有多个,那么这里由于Limit 1,只会显示其中一个。

3.6.3 Maximum of Column per Group

对每一组的列取最大值

这里求每一物品的最高价(因为不同商人价格不同,同一商品为一组)

SELECT article, MAX(price) AS price
FROM shop
GROUP BY article;

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" alt="" />

3.6.4 The Rows Holding the Group-wise Maximum of a Certain Column

对具体的列,有最大值的那个组

对每一商品,求出价最高的商人(组,多人)
SELECT article, dealer, price
FROM shop s1
WHERE price=(SELECT MAX(s2.price)
FROM shop s2
WHERE s1.article = s2.article);

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" alt="" />

这里也是将 Select Max(s2.price From shop s2 Where s1.articel = s2.article )作为一个子句的条件。

前面种方法利用了有相互关联的查询子句,可能导致效率低下。其他可能的能解决这个问题的方法是在From子句中使用相互不关联的子句。或者用Left Join

相互不关联的子句:
SELECT s1.article, dealer, s1.price
FROM shop s1
JOIN (
SELECT article, MAX(price) AS price
FROM shop
GROUP BY article) AS s2
ON s1.article = s2.article AND s1.price = s2.price;

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alt="" />


LEFT JOIN
:
SELECT s1.article, s1.dealer, s1.price
FROM shop s1
LEFT JOIN shop s2 ON s1.article = s2.article AND s1.price < s2.price
WHERE s2.article IS NULL;

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" alt="" />

Left Join 只有当s1.price是最大值时,且s2.price也没有更大值,s2这行的值为NULL时才有效。

(发现没怎么理解,暂停......待续)
 

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