SQL 两个值之间的标准

Question

我想知道，SQL 标准或 MySQL 当我们使用 'between' 时有区别吗？更准确地说，在 SQL 标准中，如果我这样做：

A between 1 and 10

是否等于：

1 <= A and A <= 10
-- or
1 < A ans 1 < 10

MySQL的结果是否相同。

Answer 1

来自mysql dev doc

expr BETWEEN min AND max

If expr is greater than or equal to min and expr is less than or equal to max, BETWEEN returns 1, otherwise it returns 0. This is equivalent to the expression (min <= expr AND expr <= max) if all the arguments are of the same type. Otherwise type conversion takes place according to the rules described in Section 12.2, “Type Conversion in Expression Evaluation”, but applied to all the three arguments.

它明确指出 1 和 10 之间的 A 将等于 1 <= A 和 A <= 10

Answer 2

在MySQL

令 "employee_tbl" table 包含员工姓名，daily_typing_pages 列。

+------+------+------------+--------------------+
| id   | name | work_date  | daily_typing_pages |
+------+------+------------+--------------------+
|    1 | John | 2007-01-24 |                250 |
|    2 | Ram  | 2007-05-27 |                220 |
|    3 | Jack | 2007-05-06 |                170 |
|    3 | Jack | 2007-04-06 |                100 |
|    4 | Jill | 2007-04-06 |                220 |
|    5 | Zara | 2007-06-06 |                300 |
|    5 | Zara | 2007-02-06 |                350 |
+------+------+------------+--------------------+

如果我们运行在这个table上进行以下查询：

SELECT * FROM employee_tbl 
WHERE daily_typing_pages BETWEEN 170 AND 300;

查询结果如下：

+------+------+------------+--------------------+
| id   | name | work_date  | daily_typing_pages |
+------+------+------------+--------------------+
|    1 | John | 2007-01-24 |                250 |
|    2 | Ram  | 2007-05-27 |                220 |
|    3 | Jack | 2007-05-06 |                170 |
|    4 | Jill | 2007-04-06 |                220 |
|    5 | Zara | 2007-06-06 |                300 |
+------+------+------------+--------------------+

这意味着作品之间包含在内。结果数据包括170和300。

在 MSSQL 中

让"Products"table包含产品数据包括产品名称、价格等

ProductID ProductName                         Price
1         Chais                          18
2         Chang                          19
3         Aniseed Syrup                  10
5         Chef Anton's Gumbo Mix          21.35
4         Chef Anton's Cajun Seasoning            22

如果我们运行在这个table上进行以下查询：

SELECT * FROM Products
WHERE Price BETWEEN 10 AND 20;

查询得到以下数据，包括在 between 子句中给出的价格。

ProductID ProductName          Price
1         Chais           18
2         Chang           19
3         Aniseed Syrup   10

所以在 MSSQL 之间作为包容性工作就像 MySQL。

你可以看看这个：http://www.tutorialspoint.com/mysql/mysql-between-clause.htm

还有这个

http://www.w3schools.com/sql/sql_between.asp

SQL 两个值之间的标准

SQL Standard between two values

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sql-standards