牛客-sql编程-错误

问题：程序异常退出, 请检查代码"是否有数组越界等异常"或者"是否有语法错误" SQL_ERROR_INFO: "You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '--合并表\nselect *\nfrom(\n select tag tid,\n uid,\n row_nu' at line1
解释：运行太多次且错误，造成分配的内存空间不足，重置代码区间，刷新释放内存空间即可_(:з)∠)_

问题：程序异常退出, 请检查代码"是否有数组越界等异常"或者"是否有语法错误"
SQL_ERROR_INFO: 'Every derived table must have its own alias'
解决：给子查询起别名！