给我出几道sql方面的题目,并给出答案
时间: 2023-05-19 14:04:03 浏览: 46
1. 查询表中所有数据
答案:SELECT * FROM table_name;
2. 查询表中特定列的数据
答案:SELECT column_name FROM table_name;
3. 查询表中特定条件的数据
答案:SELECT * FROM table_name WHERE condition;
4. 对表中数据进行排序
答案:SELECT * FROM table_name ORDER BY column_name ASC/DESC;
5. 对表中数据进行分组
答案:SELECT column_name, COUNT(*) FROM table_name GROUP BY column_name;
6. 对表中数据进行聚合计算
答案:SELECT SUM(column_name) FROM table_name;
7. 对表中数据进行连接查询
答案:SELECT * FROM table1 JOIN table2 ON table1.column_name = table2.column_name;
8. 对表中数据进行更新操作
答案:UPDATE table_name SET column_name = new_value WHERE condition;
9. 对表中数据进行删除操作
答案:DELETE FROM table_name WHERE condition;
10. 对表中数据进行插入操作
答案:INSERT INTO table_name (column1, column2, ...) VALUES (value1, value2, ...);