Question

我从2表miele和confmiele这样做了一个联盟：

 SELECT datamiele, nomemiele, codicemiele, dataconfmiele, '' AS nomeconfmiele, 
        0 AS  codiceconfmiele FROM miele
 UNION ALL
    dataconfmiele, '' AS nomemiele, 0 AS codicemiele, dataconfmiele, nomeconfmiele,
    codiceconfmiele 
 FROM confmiele

结果是正确的但不是字段datamiele和dataconfmiele（是数据字段类型）

Result il like:
datamiele
323031332d30392d3031

为字段编号分配值0或为字段varchar分配varchar给出正确的值。但是我不知道分配给日期字段的是什么？

Answer 1

通过映射精确别名来尝试这个

 SELECT datamiele, 
        nomemiele, 
        codicemiele, 
        dataconfmiele, 
        '' AS nomeconfmiele, 
        0 AS  codiceconfmiele 
 FROM miele
 UNION ALL
 SELECT  dataconfmiele AS datamiele, 
         '' AS nomemiele, 
         0 AS codicemiele, 
         dataconfmiele,
         nomeconfmiele,
         codiceconfmiele 
 FROM confmiele

Answer 2

谢谢你的解决方案我从第一次选择

中纠正了一个“'AS dataconfmiele”

我为其他人留下了解决方案

SELECT datamiele, 
        nomemiele, 
        codicemiele, 
        '' AS dataconfmiele, 
        '' AS nomeconfmiele, 
        0 AS  codiceconfmiele 
 FROM miele
 UNION ALL
 SELECT  dataconfmiele AS datamiele, 
         '' AS nomemiele, 
         0 AS codicemiele, 
         dataconfmiele,
         nomeconfmiele,
         codiceconfmiele 
 FROM confmiele

非常感谢

mysql选择union所有值的日期不正确

2 个答案: