摘要:
var NNN = new int[4] { 11, 22, 33, 44 }; var newNNN = NNN.ToDictionary(m => m, n1 => NNN.Select((a, index) => new { a, index }).FirstOrDefault(b => b. 阅读全文
摘要:
delete A from Table A where exists(select count(*)c from Table B where A.col1=B.col1 and A.col2=B.col2 having count(*)>1) 注意 delete 后面的A必写,不然会报错 如果用in 阅读全文