列举SQL数据库的命令代码以及作用
时间: 2024-06-01 11:14:28 浏览: 21
Sure, I'd be happy to help. Here are some common SQL commands and their uses:
1. SELECT: Used to retrieve data from one or multiple tables.
2. INSERT: Used to insert data into a table.
3. UPDATE: Used to modify existing data in a table.
4. DELETE: Used to delete data from a table.
5. CREATE: Used to create a table.
6. ALTER: Used to modify the structure of an existing table.
7. DROP: Used to delete an entire table.
8. TRUNCATE: Used to delete all data from a table.
9. JOIN: Used to combine data from multiple tables into a single result set.
10. UNION: Used to combine results from two or more SELECT statements into a single result set.
I hope this helps! Let me know if you have any more questions.