当我运行一条联合查询的sql语句时报如下错误: [Err] 1248 - Every derived table must have its own alias,大概意思是每一张派生表必须要有自己的别名.这里加上别名即可. 原先sql: select * from t_test t1 where t1.content like '%test%' Union all select * from (select * from t_test t2 where t2.content not like '…
问题描述 [Err] 1248 - Every derived table must have its own alias 问题原因 这句话的意思是说每个派生出来的表都必须有一个自己的别名 我的Mysql语句是:select count(*) from (select * from dede_spacemoney group by sid) 当我执行到这里的时候就抛出了这个异常,原来我进行嵌套查询的时候子查询出来的的结果是作为一个派生表来进行上一级的查询的,所以子查询的结果必须要有一个别名 把M…
执行一个sql语句,报错:1248 - Every derived table must have its own alias 提示说每一个衍生出来的表,必须要有自己的别名 执行子查询的时候,外层查询会将内层的查询当做一张表来处理,所以我们需要给内层的查询加上别名 错误的: select count(*) from( select FROM_UNIXTIME(`user_task`.`CREATE_TIMESTAMP`, "%Y-%m-%d") FROM r_user_task `u…
(转载)http://hi.baidu.com/lylegend13/item/a79f17eb51f5dff7e0a5d43b 1. select count(distinct CName) from Course 2. select count(CName) from (select distinct CName from Course) as temp as可有可无.temp作为别名,若无则提示错误:1248 - Every derived table must have its own…
1.错误描述 1 queries executed, 0 success, 1 errors, 0 warnings 查询:SELECT stu_id, (SELECT stu_name FROM t_student_info t WHERE t.stu_id = t.stu_id) stu_name FROM (SELECT SUM( CASE course WHEN '敮.. 错误代码: 1248 Every derived table must have its own alias 执行耗…
用python3.6.5创建mysql库时出现如下报错,虽然报错,但是数据库可以插入成功. D:\python3\lib\site-packages\pymysql\cursors.py:170: Warning: (3719, "'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider usin…
SELECT COUNT(1) FROM (select tid from teacher where tname like '李%') 1248 - Every derived table must have its own alias, Time: 0.000000s 要给子查询的表 加一个伪名 SELECT COUNT(1) FROM (select tid from teacher where tname like '李%') as fuck;…
完整错误信息如下: Every derived table must have its own alias 三月 28, 2017 10:20:46 上午 org.apache.catalina.core.StandardWrapperValve invoke 严重: Servlet.service() for servlet [SpringMVC] in context with path [/yuyi] threw exception [Request processing failed;…
mysql执行update报错 Err] 1055 - 'information_schema.PROFILING.SEQ' isn't in GROUP BY 今天开发的同事发来如下错误信息,最最简单的一个update操作,竟然报了[Err] 1055 - 'information_schema.PROFILING.SEQ' isn't in GROUP BY.具体sql语句为: [SQL]UPDATE draw_record SET open_price = '6945.98', buy_p…
