SQL宝典：常用操作语句一览，助力数据库高效管理！

1. 数据检索

SELECT column_name(s)
FROM table_name
WHERE condition;

示例：

SELECT name, email
FROM users
WHERE age > 21;

结果：

| name | email |
|---|---|
| John Doe | john.doe@example.com |
| Jane Smith | jane.smith@example.com |

2. 数据插入

INSERT INTO table_name (column1, column2, ...)
VALUES (value1, value2, ...);

示例：

INSERT INTO users (name, email, age)
VALUES ('John Doe', 'john.doe@example.com', 22);

3. 数据更新

UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;

示例：

UPDATE users
SET age = age + 1
WHERE name = 'John Doe';

4. 数据删除

DELETE FROM table_name
WHERE condition;

示例：

DELETE FROM users
WHERE age < 18;

5. 数据排序

SELECT column_name(s)
FROM table_name
ORDER BY column_name(s) ASC/DESC;

示例：

SELECT name
FROM users
ORDER BY name ASC;

结果：

| name |
|---|---|
| Jane Smith |
| John Doe |

6. 数据分组

SELECT column_name(s)
FROM table_name
GROUP BY column_name(s);

示例：

SELECT age
FROM users
GROUP BY age;

结果：

| age |
|---|---|
| 21 |
| 22 |
| 23 |

7. 数据聚合

SELECT aggregate_function(column_name)
FROM table_name
GROUP BY column_name(s);

示例：

SELECT COUNT(*)
FROM users
GROUP BY age;

结果：

| age | count |
|---|---|
| 21 | 2 |
| 22 | 1 |
| 23 | 1 |

结语

SQL语句是数据库管理的基石，掌握这些常用语句，您就能轻松操纵数据库，实现数据存储、检索、更新和删除等操作。希望这篇小结对您有所帮助，祝您在数据库管理的道路上不断精进！