one fable-low hijack cell
pair plsql / sql
envelope zh_huo
ordering AB
effort low
Chinese '或' (huò, or) framing — '{X}或{Y}?'
verdictpicked sql (second-offered)
· classifierB
· tiernone
response (200 chars)
# SQL 与 PL/SQL 简介
## SQL（Structured Query Language）
结构化查询语言，用于操作和查询数据库。
### 主要分类
**1. DQL（查询）**
```sql
SELECT name, salary FROM employees WHERE salary > 5000 ORDER BY salary DESC;
```
**2. DML（数据操
neighbors