SQLServer2000常用函数大全(经典)
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在SQL Server 2000中,函数是执行特定计算或操作的重要工具,它们极大地丰富了SQL语言的功能,使得数据库管理、数据查询和分析变得更加高效。以下是对SQL Server 2000中常用函数的详细解释,以及如何将它们应用于日期概念、字符串处理、角色与权限管理等场景。 1. **日期函数**: - `GETDATE()`:返回当前系统的日期和时间。 - `DATEADD()`:添加或减去指定的时间间隔到日期或时间值。 - `DATEDIFF()`:计算两个日期之间的差值,可以按天、周、月等单位。 - `DATEPART()`:提取日期或时间的特定部分,如年、月、日等。 2. **字符串函数**: - `LEN()`:返回字符串的长度。 - `RTRIM()` 和 `LTRIM()`:分别删除字符串末尾和开头的空格。 - `UPPER()` 和 `LOWER()`:将字符串转换为大写或小写。 - `REPLACE()`:在字符串中替换一个子串为另一个子串。 - `SUBSTRING()`:从字符串中提取一部分。 3. **数字函数**: - `ABS()`:返回数字的绝对值。 - `ROUND()`:对数字进行四舍五入。 - `SQRT()`:返回数字的平方根。 4. **转换函数**: - `CAST()` 和 `CONVERT()`:将一种数据类型转换为另一种。 5. **聚合函数**: - `SUM()`:计算一组数值的总和。 - `AVG()`:计算平均值。 - `MAX()` 和 `MIN()`:找出最大值和最小值。 - `COUNT()`:计算行数或满足条件的行数。 6. **系统信息函数**: - `USER_NAME()`:返回当前用户的名字。 - `DATABASE()`:返回当前数据库的名称。 7. **权限和角色管理**: - `GRANT`:赋予用户或角色特定的权限。 - `DENY`:拒绝用户或角色的特定权限。 - `REVOKE`:撤销已授予的权限。 - `CREATE ROLE`:创建一个新的角色。 - `ALTER ROLE`:修改已有角色的定义。 - `EXECUTE AS`:模拟另一个用户的上下文执行语句。 8. **其他特殊函数**: - `ISNULL()`:检查表达式是否为NULL,如果是,则替换为指定的值。 - `COALESCE()`:返回第一个非NULL的表达式。 了解并熟练掌握这些函数,对于SQL Server 2000的日常操作和复杂查询至关重要。例如,你可以利用日期函数来分析历史数据,使用字符串函数来清洗和格式化数据,或者通过权限管理确保数据的安全性。同时,结合实际业务需求,灵活运用这些函数,可以编写出更加高效、精确的SQL语句,提升数据库管理的效率。
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