@Select("select * from (select * from createpost where createdAt between #{createdBegin} and #{createdEnd}) " + "limit #{start},#{end} ") HashMap<String,Object> findPage(Integer start, Integer end,Date createdBegin,Date createdEnd);报错 "\r\n### Error querying database. Cause: java.sql.SQLSyntaxErrorException: Every derived table must have its own alias\r\n### The error may exist in com/example/myhoutai/mapper/PostMapper.java (best guess)\r\n### The error may involve com.example.myhoutai.mapper.PostMapper.findCount-Inline\r\n### The error occurred while setting parameters\r\n### SQL: select count(*) from (select * from createpost where createdAt between ? and ?) limit ?,?\r\n### Cause: java.sql.SQLSyntaxErrorException: Every derived table must have its own alias\n; bad SQL grammar []; nested exception is java.sql.SQLSyntaxErrorException: Every derived table must have its own alias",

这个错误是因为 SQL 语句中的子查询必须要有别名，你可以在子查询后面添加别名，例如：

select count(*) from (select * from createpost where createdAt between ? and ?) as c limit ?,?

这样就为子查询添加了别名 `c`，避免了出现该错误。

相关问题

select * from 表 where 1=1 and #{字段} >rownum 改为pgsql 写法

在 PostgreSQL 中，没有类似于 Oracle 中的 `ROWNUM` 伪列，但可以使用 `LIMIT` 和 `OFFSET` 关键字来实现类似的功能。因此，可以将上述查询改写为：

SELECT * FROM table_name WHERE column_name > #{value} LIMIT 10 OFFSET #{rownum};

其中，`value` 是要比较的值，`rownum` 是要跳过的行数，`10` 表示要输出的行数。这将从表 `table_name` 中选择所有列，并且只输出满足条件 `column_name > value` 的前 10 行，跳过前面的 `rownum` 行。需要注意的是，`LIMIT` 和 `OFFSET` 关键字的顺序是不能颠倒的，否则查询结果会不正确。

select * as ## from ##where

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