sql server面试八股文
时间: 2023-11-17 18:02:20 浏览: 360
SQL Server面试八股文是指在SQL Server面试中常被问到的一些基础问题和操作,以下是一些常见的问题和操作:
1. SQL Server中如何创建表?如何删除表?
- 创建表:CREATE TABLE table_name (column1 datatype1, column2 datatype2, column3 datatype3, ...);
- 删除表:DROP TABLE table_name;
2. SQL Server中如何插入数据?如何更新数据?如何删除数据?
- 插入数据:INSERT INTO table_name (column1, column2, column3, ...) VALUES (value1, value2, value3, ...);
- 更新数据:UPDATE table_name SET column1 = value1, column2 = value2, ... WHERE some_column = some_value;
- 删除数据:DELETE FROM table_name WHERE some_column = some_value;
3. SQL Server中如何查询数据?如何排序数据?如何分组数据?
- 查询数据:SELECT column1, column2, ... FROM table_name WHERE some_column = some_value;
- 排序数据:SELECT column1, column2, ... FROM table_name ORDER BY column1 ASC/DESC;
- 分组数据:SELECT column1, COUNT(column2) FROM table_name GROUP BY column1;
4. SQL Server中如何使用聚合函数?如何使用子查询?
- 聚合函数:SELECT COUNT(column1), AVG(column2), SUM(column3) FROM table_name;
- 子查询:SELECT column1 FROM table_name WHERE column2 = (SELECT MAX(column2) FROM table_name);
5. SQL Server中如何使用事务?如何使用锁?
- 事务:BEGIN TRANSACTION; COMMIT; ROLLBACK;
- 锁:SELECT * FROM table_name WHERE column1 = some_value FOR UPDATE;
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