标签:limit size mes res ted exist auto lap asc
记录 [3,+2) 从0编号,第三行记录序号为 2
limit offset
子查询
子查询查出第三行记录的dept_no
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--
-- Host: localhost Database: employees
-- ------------------------------------------------------
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/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
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--
-- Table structure for table `departments`
--
DROP TABLE IF EXISTS `departments`;
/*!40101 SET @saved_cs_client = @@character_set_client */;
/*!50503 SET character_set_client = utf8mb4 */;
CREATE TABLE `departments` (
`dept_no` char(4) NOT NULL,
`dept_name` varchar(40) NOT NULL,
PRIMARY KEY (`dept_no`),
UNIQUE KEY `dept_name` (`dept_name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
/*!40101 SET character_set_client = @saved_cs_client */;
--
-- Dumping data for table `departments`
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LOCK TABLES `departments` WRITE;
/*!40000 ALTER TABLE `departments` DISABLE KEYS */;
INSERT INTO `departments` VALUES (‘d009‘,‘Customer Service‘),(‘d005‘,‘Development‘),(‘d002‘,‘Finance‘),(‘d003‘,‘Human Resources‘),(‘d001‘,‘Marketing‘),(‘d004‘,‘Production‘),(‘d006‘,‘Quality Management‘),(‘d008‘,‘Research‘),(‘d007‘,‘Sales‘);
/*!40000 ALTER TABLE `departments` ENABLE KEYS */;
UNLOCK TABLES;
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/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
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/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;
-- Dump completed on 2021-05-18 9:50:05
SELECT
*
FROM
departments t1
JOIN ( SELECT dept_no FROM departments ORDER BY dept_no ASC LIMIT 2, 1 ) t2
WHERE
t1.dept_no >= t2.dept_no
ORDER BY
t1.dept_no ASC
LIMIT 2
子查询在索引上完成
标签:limit size mes res ted exist auto lap asc
原文地址:https://www.cnblogs.com/dissipate/p/14780146.html