题目1：这道题是查询出至少连续出现3次的数字createtablesql1_5(  idint,  numint)rowformatdelimitedfieldsterminatedby'';  INSERTINTOsql1_5(id,num)VALUES(1,1),(2,1),(3,1),(4,2),(5,1),(6,2),(7,2);sql如下：witht1as