mysql 使用技巧 分页limit

mysql 分页使用 limit关键字，limit x,y （x代表从哪条数据开始，y代表页面大小。mysql第一条数据在limit计算时索引为0）

limit 10
　　前10条
limit 0,10
　　从第1条开始的10条
limit 10,10
　　从第 11 条开始的 10 条
limit 100,10
 　从第101条开始的10条
 　数据量大时(>千万)，效率低

oracal 分页，使用 oracle的特殊列 rownum
select * from
(select *,rownum R from
(select * from a)

实例：查找入职员工时间排名倒数第三的员工所有信息。limit 2,1代表选择从第3条数据开始的1条数据，即第3页数据，页面大小为1

select * from employees order by hire_date desc limit 2,1

前n条数据，即从索引0开始计算:limit n 或者 limit 0,n

mysql> select * from employees order by hire_date desc limit 5;
+-------------+------------+-----------+---------+--------------------+------------+----------+---------+----------------+------------+---------------+
| employee_id | first_name | last_name | email   | phone_number       | hire_date  | job_id   | salary  | commission_pct | manager_id | department_id |
+-------------+------------+-----------+---------+--------------------+------------+----------+---------+----------------+------------+---------------+
|         173 | Sundita    | Kumar     | SKUMAR  | 011.44.1343.329268 | 2000-04-21 | SA_REP   | 6100.00 |           0.10 |        148 |            80 |
|         167 | Amit       | Banda     | ABANDA  | 011.44.1346.729268 | 2000-04-21 | SA_REP   | 6200.00 |           0.10 |        147 |            80 |
|         166 | Sundar     | Ande      | SANDE   | 011.44.1346.629268 | 2000-03-24 | SA_REP   | 6400.00 |           0.10 |        147 |            80 |
|         128 | Steven     | Markle    | SMARKLE | 650.124.1434       | 2000-03-08 | ST_CLERK | 2200.00 |           NULL |        120 |            50 |
|         165 | David      | Lee       | DLEE    | 011.44.1346.529268 | 2000-02-23 | SA_REP   | 6800.00 |           0.10 |        147 |            80 |
+-------------+------------+-----------+---------+--------------------+------------+----------+---------+----------------+------------+---------------+
5 rows in set (0.00 sec)

mysql> select * from employees order by hire_date desc limit 0,5;
+-------------+------------+-----------+---------+--------------------+------------+----------+---------+----------------+------------+---------------+
| employee_id | first_name | last_name | email   | phone_number       | hire_date  | job_id   | salary  | commission_pct | manager_id | department_id |
+-------------+------------+-----------+---------+--------------------+------------+----------+---------+----------------+------------+---------------+
|         173 | Sundita    | Kumar     | SKUMAR  | 011.44.1343.329268 | 2000-04-21 | SA_REP   | 6100.00 |           0.10 |        148 |            80 |
|         167 | Amit       | Banda     | ABANDA  | 011.44.1346.729268 | 2000-04-21 | SA_REP   | 6200.00 |           0.10 |        147 |            80 |
|         166 | Sundar     | Ande      | SANDE   | 011.44.1346.629268 | 2000-03-24 | SA_REP   | 6400.00 |           0.10 |        147 |            80 |
|         128 | Steven     | Markle    | SMARKLE | 650.124.1434       | 2000-03-08 | ST_CLERK | 2200.00 |           NULL |        120 |            50 |
|         165 | David      | Lee       | DLEE    | 011.44.1346.529268 | 2000-02-23 | SA_REP   | 6800.00 |           0.10 |        147 |            80 |
+-------------+------------+-----------+---------+--------------------+------------+----------+---------+----------------+------------+---------------+
5 rows in set (0.00 sec)

更多例子 

limit 5     前5条数据

limit 2,1   第3页数据，页面大小为1

limit 2,2   第2页数据，页面大小为2

limit 2,3   第3条数据起，共3条数据，此数据不符合分页数据显示格式
分页显示格式：limit startIndex pageSize
startIndex = (需要查询的页码数 - 1) * pageSize

mysql> select * from employees order by hire_date desc limit 5;
+-------------+------------+-----------+---------+--------------------+------------+----------+---------+----------------+------------+---------------+
| employee_id | first_name | last_name | email   | phone_number       | hire_date  | job_id   | salary  | commission_pct | manager_id | department_id |
+-------------+------------+-----------+---------+--------------------+------------+----------+---------+----------------+------------+---------------+
|         173 | Sundita    | Kumar     | SKUMAR  | 011.44.1343.329268 | 2000-04-21 | SA_REP   | 6100.00 |           0.10 |        148 |            80 |
|         167 | Amit       | Banda     | ABANDA  | 011.44.1346.729268 | 2000-04-21 | SA_REP   | 6200.00 |           0.10 |        147 |            80 |
|         166 | Sundar     | Ande      | SANDE   | 011.44.1346.629268 | 2000-03-24 | SA_REP   | 6400.00 |           0.10 |        147 |            80 |
|         128 | Steven     | Markle    | SMARKLE | 650.124.1434       | 2000-03-08 | ST_CLERK | 2200.00 |           NULL |        120 |            50 |
|         165 | David      | Lee       | DLEE    | 011.44.1346.529268 | 2000-02-23 | SA_REP   | 6800.00 |           0.10 |        147 |            80 |
+-------------+------------+-----------+---------+--------------------+------------+----------+---------+----------------+------------+---------------+
5 rows in set (0.00 sec)

mysql> select * from employees order by hire_date desc limit 2,1;
+-------------+------------+-----------+-------+--------------------+------------+--------+---------+----------------+------------+---------------+
| employee_id | first_name | last_name | email | phone_number       | hire_date  | job_id | salary  | commission_pct | manager_id | department_id |
+-------------+------------+-----------+-------+--------------------+------------+--------+---------+----------------+------------+---------------+
|         166 | Sundar     | Ande      | SANDE | 011.44.1346.629268 | 2000-03-24 | SA_REP | 6400.00 |           0.10 |        147 |            80 |
+-------------+------------+-----------+-------+--------------------+------------+--------+---------+----------------+------------+---------------+
1 row in set (0.00 sec)

mysql> select * from employees order by hire_date desc limit 2,2;
+-------------+------------+-----------+---------+--------------------+------------+----------+---------+----------------+------------+---------------+
| employee_id | first_name | last_name | email   | phone_number       | hire_date  | job_id   | salary  | commission_pct | manager_id | department_id |
+-------------+------------+-----------+---------+--------------------+------------+----------+---------+----------------+------------+---------------+
|         166 | Sundar     | Ande      | SANDE   | 011.44.1346.629268 | 2000-03-24 | SA_REP   | 6400.00 |           0.10 |        147 |            80 |
|         128 | Steven     | Markle    | SMARKLE | 650.124.1434       | 2000-03-08 | ST_CLERK | 2200.00 |           NULL |        120 |            50 |
+-------------+------------+-----------+---------+--------------------+------------+----------+---------+----------------+------------+---------------+
2 rows in set (0.00 sec)

mysql> select * from employees order by hire_date desc limit 2,3;
+-------------+------------+-----------+---------+--------------------+------------+----------+---------+----------------+------------+---------------+
| employee_id | first_name | last_name | email   | phone_number       | hire_date  | job_id   | salary  | commission_pct | manager_id | department_id |
+-------------+------------+-----------+---------+--------------------+------------+----------+---------+----------------+------------+---------------+
|         166 | Sundar     | Ande      | SANDE   | 011.44.1346.629268 | 2000-03-24 | SA_REP   | 6400.00 |           0.10 |        147 |            80 |
|         128 | Steven     | Markle    | SMARKLE | 650.124.1434       | 2000-03-08 | ST_CLERK | 2200.00 |           NULL |        120 |            50 |
|         165 | David      | Lee       | DLEE    | 011.44.1346.529268 | 2000-02-23 | SA_REP   | 6800.00 |           0.10 |        147 |            80 |
+-------------+------------+-----------+---------+--------------------+------------+----------+---------+----------------+------------+---------------+
3 rows in set (0.00 sec)