between相关知识
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T-SQL BETWEEN 谓词BETWEEN谓词是检查一个值或字段值是否在指定的范围内,当括这两个指定的边界值。下面演示,是搜索出年龄23岁至30岁的会员:SELECT [MemberId],[Job],[Age],[Salary] FROM dbo.Member WHERE [Age] BETWEEN 23 AND 30 执行结果: 如果不包含此范围记录需要在BETWEEN之前加上NOT,如:SELECT [MemberId],[Job],[Age],[Salary] FROM dbo.Member WHERE [Age] NOT BETWEEN 23 AND 30 执行结果:
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MySQL的WHERE语句中BETWEEN与IN的使用教程MySQL BETWEEN 用法MySQL BETWEEN 语法BETWEEN 运算符用于 WHERE 表达式中,选取介于两个值之间的数据范围。BETWEEN 同 AND 一起搭配使用,语法如下:?12WHERE column BETWEEN value1 AND value2WHERE column NOT BETWEEN value1 AND value2通常 value1 应该小于 value2。当 BETWEEN 前面加上 NOT 运算符时,表示与 BETWEEN 相反的意思,即选取这个范围之外的值。BETWEEN 实例选取 uid 在 2 到 5 之间的用户数据:?1SELECT * FROM user WHERE uid BETWEEN 2 AND 5返回查询结果如下:除了数值类型外,BETWEEN 也支持字符串范围,如下选择出所有 username 介于 a 至 j 之间的用户(并包括单字母k/K):SELECT * FROM user WHERE username BETWEEN '
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MySQL中BETWEEN子句的用法详解可以使用IN子句来代替相结合的“大于等于和小于等于”的条件。要了解BETWEEN 子句考虑的EMPLOYEE_TBL表有以下记录:?12345678910111213mysql> SELECT * FROM employee_tbl;+------+------+------------+--------------------+| id | name | work_date | daily_typing_pages |+------+------+------------+--------------------+| 1 | John | 2007-01-24 | 250 || 2 | Ram | 2007-05-27 | 220 || 3 | Jack | 2007-05-06 |&n
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Difference between inputWe all know input markup in XHTML, which can be used to create TextBox, Button, CheckBox, RadioButton, HiddenField etc via type attribute. There are three types of button, one is used to submit form, another is used to reset form, the third one has no default actions, which should be enhanced by JavaScript.There is another markup usded to present a button is button, following is found in the W3C site:Buttons created with the BUTTON element function just li
between相关课程
between相关教程
- 3. SQL Between Between 必须与 And 一起使用,表示在某某与某某之间,常与 Where 搭配,用于查找某个范围内的数据。SQL Between 的使用语法如下:SELECT [col] FROM [table_name] WHERE [col] BETWEEN [val1] AND [val2];其中table_name代表数据表名称,col代表字段名称,val表示条件值,数字 1、2 表示多字条件值。
- 4.BETWEEN AND 更新数据 以 teacher 表为例,将 age 在 20 和 30 之间的教师身份证设置为无:UPDATE teacher SET id_number = '无' WHERE age BETWEEN 20 AND 30;Tips:注意 BETWEEN AND 包含两端的值。
- 3.1 例1、单独使用 Between Between 常用于查找某个范围内的数据记录。请书写 SQL 语句,找出imooc_user表中年龄在 18~24 之间的用户。分析:分析题干可知年龄是条件字段,而条件值是一个范围,即18~24,符合 Between 和 And 的使用。语句:整理可得语句如下:SELECT username, age FROM imooc_user WHERE age BETWEEN 18 AND 24;查询结果如下:+----------+-----+| username | age |+----------+-----+| pedro | 23 || peter | 18 || faker | 20 |+----------+-----+
- 3.3 例3、Between 与 Delete 搭配使用 Between 也可与 Delete 搭配用于删除某个范围内的记录。请书写 SQL 语句,删除imooc_user表中年龄在18~24之间的用户。分析:几乎与例1一致,只需将 Select 改为 Delete 即可。语句:DELETE FROM imooc_user WHERE age BETWEEN 18 AND 24;删除成功后,imooc_user 表中的数据如下:+----------+-----+| username | age |+----------+-----+| lucy | 29 |+----------+-----+
- 3.2 例2、Between 与 Not 搭配使用 Between 可以很好的处理范围操作,还可以与 Not 搭配表示不在某个范围内的记录。请书写 SQL 语句,找出imooc_user表中年龄不在 18~24 之间的用户。分析:与例1刚好相反,在符合 Between 和 And 的前提下,增加NOT修饰即可。语句:整理可得语句如下:SELECT username, age FROM imooc_user WHERE age NOT BETWEEN 18 AND 24;查询结果如下:+----------+-----+| username | age |+----------+-----+| lucy | 29 |+----------+-----+提示: Between 不仅可以和 Select 搭配使用,还可以搭配 Update 与 Delete。
- 5. 个人经验 如果范围条件是连续的,优先考虑使用 Between,不仅语句更为简洁,而且性能更加优异。Between 只可用于连续范围的操作,而 In 还支持非连续范围的操作。当 Delete 和 Update 使用范围操作是较危险的,容易引起批量数据更新和删除,在使用前,请仔细斟酌。
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