| 数据库 | 取一条SQL |
| Postgresql | select * from user limit 1 |
| Mysql | select * from user limit 1 |
| SQlServer | select top 1 * from user |
| Oracle | select * from user where rownum<=1 |
| DM | 以上都行 |
| Kingbase | select * from user limit 1 |
| Oscar | select * from user limit 1 |
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