以下是常用的数据库语句汇总：
1. 创建数据库：
```
CREATE DATABASE database_name;
```
2. 删除数据库：
```
DROP DATABASE database_name;
```
3. 选择数据库：
```
USE database_name;
```
4. 创建表：
```
CREATE TABLE table_name (
column1 datatype,
column2 datatype,
column3 datatype,
.....
);
```
5. 删除表：
```
DROP TABLE table_name;
```
6. 插入数据：
```
INSERT INTO table_name (column1, column2, column3, ...) VALUES (value1, value2, value3, ...);
```
7. 更新数据：
```
UPDATE table_name SET column1 = value1, column2 = value2, ... WHERE condition;
```
8. 删除数据：
```
DELETE FROM table_name WHERE condition;
```
9. 查询数据：
```
SELECT column1, column2, ... FROM table_name WHERE condition;
```
10. 合并查询：
```
SELECT column1, column2, ...
FROM table_name1
JOIN table_name2 ON condition;
```
11. 分组查询：
```
SELECT column1, COUNT(*) FROM table_name GROUP BY column1;
```
12. 带条件查询：
```
SELECT column1, column2, ... FROM table_name WHERE column_name LIKE 'value%';
```
13. 排序查询：
```
SELECT column1, column2, ... FROM table_name ORDER BY column_name ASC/DESC;
```
14. 连接查询：
```
SELECT column1, column2, ... FROM table_name1 INNER JOIN table_name2 ON condition;
```
15. 子查询：
```
SELECT column1, column2, ... FROM table_name WHERE column_name IN (SELECT column_name FROM table_name WHERE condition);
```
以上是一些常用的数据库语句，可以根据需求对其进行组合和调整。