摘要:
SELECT * FROM ( SELECT TOP 10 * FROM Questions where q_type=1 ) aa UNION ALL SELECT * FROM ( SELECT TOP 10 * FROM Questions ORDER BY q_answer_num ) bb... 阅读全文
摘要:
如果使用类似下面的SQL语句: select columnA, columnB from tableA where columnA = 'Condition 1' union select columnC, columnD from tableB where columnC = 'Condition 1' order by columnA asc 系统会报错: 消息 207,级别 16,状... 阅读全文